<platzhirsch>
If it has a state, it's not functional
<Ox0dea>
False.
<Ox0dea>
Programming is a subset of mathematics, not strictly equal to it.
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<platzhirsch>
Well, I stand on that, I really don't mind. Even Haskell can't follow with this one completely through, especially when it comes to IO and usage of Monads, even they can't avoid introducing a state
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<Ox0dea>
platzhirsch: You stand on what? That truly functional programs should just make the machine run a little hotter?
<platzhirsch>
You can call it false and put emphasis on it by ending it with a period . ;) but these are my definitions, I learned them this way in my studies, if you can point me to some thorough definitions that say otherwise, be my guest
<Ox0dea>
> put emphasis on it by ending it with a period
<platzhirsch>
What's wrong now?
<Ox0dea>
It's rather tragic how quickly that interpretation has managed to spread.
<Ox0dea>
Proplery ending sentences is now passive-aggressive.
<Ox0dea>
*Properly
<platzhirsch>
so tragic, fills me with sorrow every morning
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<Ox0dea>
>> make_adder = -> n { -> x { n + x } }; add3 = make_adder[3]; add3[2]
<Ox0dea>
(Virtually) any object can have a #[] method.
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<cyrus_mc>
Ox0dea: I figured something like this .. but in the class I posted above I don't see it referencing this library (woudln't it need to include/require it or inherit this class or create an instance of that class to access it)
<cyrus_mc>
doh .. just saw it
<cyrus_mc>
never mind
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<Ox0dea>
cyrus_mc: Not your fault; it was tucked away a bit.
<cyrus_mc>
it was
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<platzhirsch>
But I never denied that Ruby doesn't incorporate functional programming aspects, I only said if it has a state it's not functional. That's why only add3 is functional, embedded in an imperative environment which relies on objects, states and order of execution
<Ox0dea>
platzhirsch: I'm not sure I follow. You've conceded that `add3` is both functional and that it has state, which is a contradiction of your own terms.
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<platzhirsch>
sigh, the definition of add3 is functional, add3 itself is still an object
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<Ox0dea>
platzhirsch: Then my initial question stands. Why isn't `add3` itself functional?
<Ox0dea>
How does it violate the mathematical definition?
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<Ox0dea>
(Spoiler alert: it doesn't.)
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<platzhirsch>
Because it depends on side-effects, it's not enough to just declare it. The function exists within the scope of an object, it needs that, in order to be invoked you have to make it part of a code that is executed in a procedural way
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<Ox0dea>
platzhirsch: You've got it backwards. It's the "scope" that exists within the "function", so to speak.
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<platzhirsch>
If the order of execution doesn't matter, it's functional, but here the order is crucial so we get a result
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<Ox0dea>
platzhirsch: The division "function" relies on some definition of "predecessor"; does that mean division isn't functional?
<platzhirsch>
For me it would be strictly functional, if once declared and bound to it's name, it cannot be changed, because there is no order, no change possible, it's just declared as it is and that's the only thing that matters. The example is imperative, because all it's part have a state, that depend on each other, variable assignment, invoking the objects by sending methods to them here [](3)
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<Ox0dea>
You're using a lot of words to say almost nothing of consequence.
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<platzhirsch>
You're talking about mathematical functions, where as I am talking about the functional programming paradigm
<platzhirsch>
I guess that's where most of the confusion comes from
<Ox0dea>
platzhirsch: It was you who initially declared that programs can't be functional in the mathematical sense.
<Ox0dea>
Because state.
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<pipework>
Ooh nerd-off!
* pipework
grabs the popcorn
<platzhirsch>
Exactly
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<platzhirsch>
Ox0dea: Listen, you're absolutely right. I think you have very well demonstrated how smart you are, I mean that was the point of this whole discussion, who can outsmart who with his definitions, pretty mindless. But I am not too put off, at least it made me go through my old uni notes and read up again about how we defined that stuff, still love it
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<Ox0dea>
Ad hominem means you lose, bud.
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<platzhirsch>
This basically screams for a Hitler comparison, just to make the Internet laugh
<platzhirsch>
Yes Ox0dea, you won the argument
<platzhirsch>
on the Internet
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<Ox0dea>
platzhirsch: But you learned something!
<Ox0dea>
What a foolish thing about which to be butthurt.
<platzhirsch>
You write very inflammatory
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<Ox0dea>
Offense cannot be given.
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<zenspider>
can I get someone to ping envy.zenspider.com ??
<platzhirsch>
sure dude
<platzhirsch>
doesn't pong much
<zenspider>
looks down, but I'm on shitty SF wireless
<zenspider>
much, or at all?
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<zenspider>
actually, the fact that my proxy isn't holding "zenspider" here, means it's dead. how is it that it ONLY goes out when I trevel? I how does it know?
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<platzhirsch>
Hope it's not on a Raspberry Pi ;)
<jhass>
well, comcast
<jhass>
not too surprised I guess :P
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<zenspider>
that was the next plan... call in and see if it is them or me
<jhass>
I do get pretty far into their network though
<zenspider>
cable is up. host is down. comcast business support can barely understand "ping" so... *shrug*
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<zenspider>
argh. luckily my neighbors have a key
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<zenspider>
ah. neighborhood lost power... my UPS may have stayed off
<craysiii>
not a very good UPS :P
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<zenspider>
well... it can signal to the box to shutdown cleanly because it is running out. In those cases, I don't think the server comes back up when power is restored
<drbrain>
it's been out for an hour or two now over there
<zenspider>
tho, maybe I should have a scheduled "on" time, so it'll always recover if I just wait it out
<zenspider>
drbrain: about as long as I've been trying to use shitty SF cafe networks. :)
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<zenspider>
yeah. it's been restored, server jsut didn't come back up
<zenspider>
I really should move it offsite so I can switch to fiber
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<zenspider>
welp... guess I'm not releasing minitest today :)
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<zenspider>
hrm... should be back up :/
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<platzhirsch>
Any suggestions for this code to write it either shorter or more understandable? https://gist.github.com/platzhirsch/41326d2df2dd631470ce Personally I'd just hack it in one line, but that won't help others really understand what's going on. It basically padds up a certain number with zeros if there are not enough and converts the number to a base 36
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<ICantCook>
yes
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<beauby>
centrx: how about doing `def g; yield; end; def f; g do yield; end; end`, will the implicit block be resolved in f or in g?
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<jimmybomb1>
hey guys, im developing a web api and im having a debate with my colleagues whether we should put guid in our 'GET' urls.. do you guys think this is a smell? if it is what are the alternatives to put in get urls (assuming that all our resources already have guid assigned to them as their id)?
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<beauby>
jimmybomb1: This question is probably more suited to #rubyonrails, or a more general purpose webdev channel
<jimmybomb1>
alright thanks
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<Ox0dea>
>> def g; yield; end; def f; g do yield; end; end; f { caller[0, 3] } # beauby
<ruboto>
Ox0dea # => ["/tmp/execpad-3ef329ea5a54/source-3ef329ea5a54:2:in `block in f'", "/tmp/execpad-3ef329ea5a54/sourc ...check link for more (https://eval.in/437821)
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<Ox0dea>
Dammit. I forgot that'd be so ugly.
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<jt__>
is "Class#method" is just a convention but no actual meaning? I notice on rails route there is this 'class#method'
<Ox0dea>
jt__: Right, it's just notational convention for instance methods.
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<jt__>
how about the former the one on rails route? e.g get 'link' => 'link#new'
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<Ox0dea>
jt__: Same meaning, for all intensive porpoises.
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<jt__>
ok, thanks
<beauby>
>> class A; def self.a(&block); Class.new do block.call; end; end; class B < A; a do p self; end; # Ox0dea
<ruboto>
beauby # => /tmp/execpad-3df07b561a1f/source-3df07b561a1f:7: syntax error, unexpected end-of-input, expecting ke ...check link for more (https://eval.in/437822)
<beauby>
>> class A; def self.a(&block); Class.new do block.call; end; end; end; class B < A; a do p self; end; # Ox0dea
<ruboto>
beauby # => /tmp/execpad-35c10e772dae/source-35c10e772dae:7: syntax error, unexpected end-of-input, expecting ke ...check link for more (https://eval.in/437823)
<Ox0dea>
beauby: One more. :P
<beauby>
Damn, sorry, I have to get better at one-lining ruby
<beauby>
>> class A; def self.a(&block); Class.new do block.call; end; end; end; class B < A; a do p self; end; end; # Ox0dea
<beauby>
And that's what I nailed my issue down to
<beauby>
I want `self` to be that of `Class.new` here
<beauby>
I had some hope it would be some implicit blocks limitation when I started with yield, but it seems to make no difference
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<Ox0dea>
beauby: Are you sure you want to call the block and have that be the body of the class?
<beauby>
Ox0dea: yes I am
<Ox0dea>
beauby: I'm pretty sure #instance_eval could be finagled into doing your monstrous bidding.
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<beauby>
Ox0dea: Thanks, I'll look that up. Basically what I'd like to achieve is, inside a class `B < A`, having a class method from `A`, let's say `implicit_define_class` called like `implicit_define_class do ... end`, that would actually create a class inside `A`, with body what's provided in the given block
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<beauby>
>> class A; def self.a(&block); Class.new.instance_eval do block.call; end; end; end; class B < A; a do p self; end; end; # Ox0dea
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<shevy>
the picture looks so fake
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<bnagy>
Ox0dea: ha. That regex is the same as using sub but I don't use crazy perl globals :)
<KervyN>
like every selfy
<shevy>
nah
<bnagy>
the $' is cute though, I didn't know that one
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* bnagy
saves up for golf
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<sabrehagen>
i've never use a ruby gem before. i just typed `gem install pdf-extract` which succeeded, now typing `pdf-extract` as per the docs yeilds "command not found". how do i use the gem? (https://github.com/CrossRef/pdfextract)
<ruboto>
apeiros # => no implicit conversion of #<Class:0x4112fee4> into Array (TypeError) ...check link for more (https://eval.in/438048)
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<apeiros>
ljarvis: where did you see differences appear?
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<sheepman>
hi all, whats the best way of getting the pid of a running process (i.e. not the pid of the ruby script thats running) ?
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<adaedra>
A process you started? A random process on the system?
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<sheepman>
Random process
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<sheepman>
looks like sys-proctable to me but i was hoping for something simpler as in, without pulling in an additional gem
<certainty>
pgrep -f
<certainty>
depends on what you know about the process
<certainty>
also /proc is pretty accessible
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<sheepman>
certainty, i guess pgrep will work for me
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<sheepman>
just wanted to stick inside ruby but meh :)
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<keksi_>
hey, im using rbenv for handling my ruby versions. rbenv says that I only have 2.2.1 installed, but ruby -v says its using 2.0. So I think I have a random v. 2.0 installed, which I want to get rid of, what do?
<certainty>
i'm curious if there's a way without forking a shell. I'm not aware of a way (without gems)
<certainty>
reading information from /proc is perfectly possible though
<sheepman>
ok thanks certainty
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<ljarvis>
apeiros: I'm not sure now actually, moved on. Maybe there wasn't a difference, I found it odd that to_h didn't work like to_hash in that situation but actually it seems quite consistent
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<yorickpeterse>
ljarvis: wow, you're back
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<Phil-Work>
can someone tell me what this code does? Struggling to Google as I have no idea what kind of programming structure it is...
<Phil-Work>
b1.use Call, UploadIsoFile do |env2, b2|
<Phil-Work>
... some code ...
<Phil-Work>
end
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<canton7>
execute the method 'b1.use', passing in the parameters Call and UploadIsoFile (which looks like they're classes). Also pass in an anonymous function, which takes the parameters env2 and b2, and may or may not return something...
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<Phil-Work>
canton7, so... what relevance does it have as a control structure?
<Phil-Work>
in what instance will the "some code" execute?
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<Phil-Work>
if b1.use returns something trueish?
<canton7>
'some code' is an anonymous function, which is passed to 'b1.use'. It will execute if and when the code in 'b1.use' executes it
<jhass>
Phil-Work: it's passed to b1.use, which can call it or store it for calling it later
<Phil-Work>
ah, ok
<Phil-Work>
I see now
<Phil-Work>
b1 is presumably an object?
<Phil-Work>
how do I see what it is an instance of so I can find "use"?
<canton7>
probably. it may be a local method which returns an object, but it's probably an object :P
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<canton7>
'p b1'
<canton7>
or 'puts b1.class'
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<Phil-Work>
"Vagrant::Action::Builder"
<Phil-Work>
excellent - thanks
<Phil-Work>
gives me something to go on
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<vivcheri>
Hi, I am trying a vagrant installation of bosh-lite and I am getting the following error http://paste.ubuntu.com/12530122/
<vivcheri>
How do I resolve this ?
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<Kariel>
Hi everyone.
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<jhass>
vivcheri: do you see a Gemfile?
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<vivcheri>
jhass: Iam new to ruby
<vivcheri>
jhass: Do you mean to_specs ?
<jhass>
no I mean whether you see a file called "Gemfile"
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<vivcheri>
re-running the bosh target 192.168.50.4 lite
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<vivcheri>
jhass: It works now
<Cysioland>
Is there a gem that converts something like '1h10m30s' to seconds?
<jhass>
Cysioland: chronic_duration or so
<vivcheri>
jhass: Thanks a lot
<vivcheri>
I am logged into the bosh director.
<jhass>
no idea what went wrong there
<jhass>
probably fixed in a less ancient rubygems version than what Ruby 1.9/Ubuntu ships
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<shevy>
hehe
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<Cysioland>
jhass++
<Cysioland>
thank mr jhass
<Cysioland>
bye
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<vivcheri>
jhass: Are you still there ?
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<yorickpeterse>
jhass: oooh, I see you've been promoted to Mr now
<matti>
yorickpeterse: ;]
<yorickpeterse>
(っ´ω｀)っ
<matti>
Haha
<matti>
:)
<vivcheri>
jhass: I am asked to add a route on step 4 in the bosh lite documentation.
<vivcheri>
Wondering what route is he meaning ?
<jhass>
doesn't the readme or other docs explain?
<jhass>
I never even saw that stuff before either
<matti>
Mr Hass.
<matti>
Souds very official.
<apeiros>
mr zyx
<vivcheri>
jhass: No
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<yorickpeterse>
but so who will be the other Mr or Mrs jhass? :>
<matti>
Hey apeiros
<apeiros>
oy matti
<matti>
Oh pardon me. Mr apeiros :)
<vivcheri>
There is a add-route binary in the bin folder under the bosh-lite binary
<apeiros>
matti: I prefer deity
<matti>
Hehe
<matti>
apeiros-sama?
<matti>
:)
<apeiros>
or actually… proto-deity
<yorickpeterse>
apeiros-senpai
<jhass>
vivcheri: so run it?
<jhass>
?apeiros
<ruboto>
apeiros is nobody. They're one of the four people with founders access in the #ruby channel, owner of ruboto the channel bot and ruby-community.com the companion website for the #ruby channel
<jhass>
nobody doesn't need any titles
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<vivcheri>
jhass: done.
<Ryzokuken>
Hey
<Ryzokuken>
Anyone up?
<Ryzokuken>
I had a little problem
<Ryzokuken>
Could you help?
<jhass>
?ask
<ruboto>
Don't ask to ask. Just ask your question, and if anybody can help, they will likely try to do so.
<Ryzokuken>
I wanted to serialize an array of objects
<Ryzokuken>
How could I achieve that?
<yorickpeterse>
Serialize to what?
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<Ryzokuken>
String
<Ryzokuken>
Binary
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<absklb>
i installed bundler 1.10.6 and my canvas lms script cant fint it. it complains that i have old version of bundler. but gem list b shows it at 1.10.6 which is needed by canvas
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<r0x0rZ>
yorickpeterse: works like a charm now. thank you!
<ljarvis>
yorickpeterse: no, had lots of trouble the last few weeks. We exchange contracts a few months ago but it was still being built. We move in this weekend
<Ryzokuken>
Because wherever it is, its not called
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<yorickpeterse>
Ryzokuken: ........
<Ryzokuken>
It worked
<yorickpeterse>
"use p"
<yorickpeterse>
"I used alert"
<yorickpeterse>
I'm done
<ljarvis>
yorickpeterse: jesus that upload.. glorious
<yorickpeterse>
You're on your own
* certainty
admires yorickpeterse for his patience
<tobiasvl>
Ryzokuken: and when you used p, what did it output?
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<sabrehagen>
using jquery's html function as a setter (http://api.jquery.com/html/) with html that contains the string '\text' converts the \t to a tab. how do i make it not interpret escaped characters?
<Ryzokuken>
Sorry :(
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<ljarvis>
sabrehagen: this is #ruby
<yorickpeterse>
ljarvis: it really helps uploading cat pictures
<ljarvis>
that is not Ruby
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<Ryzokuken>
P is not outputting anything
<sabrehagen>
ljarvis: wow sorry, new irc client and confused the channel :)
<Ryzokuken>
Nothing shootsup
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<Ryzokuken>
No p
<Ryzokuken>
No kernel.p
<Ryzokuken>
Nothing
<Ryzokuken>
+ I'm sorry
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<ljarvis>
sabrehagen: no worries :)
<Ryzokuken>
Forgive me
<pyoor>
what is the safest way to include a variable in a string? I'm currently using "foo #{bar}" but special characters in bar is causing the string to be truncated.
<Ryzokuken>
Help me figure out
<ljarvis>
pyoor: what kind of special characters?
<Ryzokuken>
yorickpeterse: pls?
<ljarvis>
Ryzokuken: please stop hitting return so often. You can type many things on a single line
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<pyoor>
ljarvis \' - I'm calling a string as part of a regex
<pyoor>
My regex is - data = data.sub(/<head.*?>/im, "\\0\n<script type='text/javascript'>\n#{foo}\n</script>")
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<ljarvis>
pyoor: I don't understand what you want exactly, but if it's a regexp maybe you want Regexp.escape
<yorickpeterse>
Ryzokuken: No, I have work to get done
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<Ryzokuken>
:(
<pyoor>
ljarvis: this is part of the replace string
<ljarvis>
pyoor: then I don't understand the problem
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<yorickpeterse>
haha, somebody is trying to parse JS with regex it seems
<imperator>
uri question. if I have "http://myaccount.blob.core.windows.net", and I call URI.parse on it to get a uri object, is there a method to just get "myaccount"? Or am I just supposed to split the host manually?
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* imperator
is dealing with "canonical urls"
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<absklb>
anyone using canvas lms here?
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<jhass>
imperator: URI doesn't specify a decomposition for authority I think
<jhass>
so yeah, split
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<imperator>
jhass, thanks
<imperator>
wonder if Addressable does
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<jhass>
highly doubt it
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<jhass>
an URI doesn't care too much about the structure of it
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<imperator>
ok, thanks, figured that but thought I'd ask
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<Coraline>
absklb: what do you need to know about Canvas?
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* imperator
grumbles about the Hash.new constructor
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<absklb>
Coraline, it was giving me error regarding one mocha.git repo on git hub. it said me to do bundle install to check it out. i did. still same error. but now i after many tries i diid bundle update and now finally it is getting that repo!
<absklb>
Coraline, still not solved though. can use your help if you are free.
<jhass>
?anyone absklb
<ruboto>
absklb, Just ask your question, if anyone has or can, they will respond.
* absklb
knows.
<Coraline>
What's not solved? It sounds like it works now?
<absklb>
he repilied and my next reply is going to take time due to bundle update in progress hence....
<absklb>
Coraline, i will know once this bundle update fiinishes
<Coraline>
She
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<shevy>
he reptilied?
<jhass>
don't you know we're ruled by reptiloids?
<absklb>
:-)
<shevy>
I was an eye witness when dinosaurs were programming!
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<Burgestrand>
And then the great refactor, now no more dinosaurs.
<shevy>
yeah
<imperator>
and then.....someone used a goto statement
<imperator>
adios programming dinosaurs
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<absklb>
libxml2 is missing. is that to be installed by gem or os?
<Coraline>
OS
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<absklb>
ok
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<absklb>
I did sudo apt-get install ruby-libxml libxml2 libxml2-dev and still get error for libxml in canvas bundle update?
<absklb>
whats wrong?
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<absklb>
so it says nokogiri needs its own libxml not random by os.
<absklb>
but i can make it use os one. shall i?
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<apt-get>
absklb: the easiest way might be to "gem install nokogiri"
<absklb>
i think its already installed. its now trying to update
<absklb>
let me try though
<yorickpeterse>
hihi, nokogiri
<absklb>
??
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<havenwood>
yorickpeterse: I was just thinking of Oga.
<yorickpeterse>
havenwood: how romantic
<yorickpeterse>
havenwood: Oga also thinks a lot about you
* havenwood
cries a single tear
<yorickpeterse>
(͡° ͜ʖ ͡°)
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<shevy>
you nerds!
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<adaedra>
no u
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<shevy>
you french!
<adaedra>
Plait-il ?
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<shevy>
slightly better, now what is the behaviour that is confusing?
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<pyoor>
I'm trying to make a replacement in a string but the replacement string contains \\'. For some reason, the replacement string is split into two parts
<Kendos-Kenlen>
C'est bon la baguette !
<pyoor>
The second occuring at the end of the source string
<Kendos-Kenlen>
Vive la baguette, le pain et les bérêts ! :D
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<shevy>
I can't even get the example to work
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<shevy>
pyoor yeah, File.read() will give you a string, File.readlines() an array. for .gsub you can use a {} variant
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<Burgestrand>
pyoor: ^
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<Burgestrand>
pyoor: when you pass "bar" as a second argument to #sub, it will be interpreted by Ruby in a special way, replacing things prefixed by \\.
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<Burgestrand>
pyoor: if instead you pass it as a block, e.g. "Your string".sub(/regex/) { "replacement" }, it won't be interpreted in this special way.
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<Burgestrand>
pyoor: Yes. Skip the second argument.
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<Burgestrand>
pyoor: foo.sub(/<head>/) { bar }
<pyoor>
awesome - thanks again for that
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<Burgestrand>
pyoor: Ruby will use the return value of the block (code inside curly braces), which is "bar", and will *not* interpret it in the special way that String#sub interprets its second argument.
<pyoor>
I completely missed that in the documentation
<Burgestrand>
pyoor: Most people do, including me, I've been bitten by it before. :)
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<Burgestrand>
String#sub and String#gsub be crazy when it comes to backslashes in the replacement string.
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<pyoor>
well thanks again - I've been stuck on this for a few hours this morning
<pyoor>
trying different string concatenation, etc - thinking that was the issue
<Burgestrand>
pyoor: Nope, it's just String#sub being incredibly weird.
<Burgestrand>
Most of the time the stdlib does useful things, String#sub is a rare occurrence.
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<shevy>
off-topic, perhaps someone knows, I just want to know if it is possible - if you have a rails site, can you easily generate a .pdf from this, by just using ruby code? (I currently use wkhtmltopdf)
<lagweezle>
shevy: Generate a PDF of/from .. what, exactly?
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<shevy>
hmm let's say you just have a single page in rails, let's say ... hmm... just a page with lots of pictures
<shevy>
or perhaps a pay-stuff formular :)
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<shevy>
wkhtmltopdf works quite ok so far, the only minor issue I see so far is with the inner-page padding being too large in the .pdf file
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<pyoor>
Burgestrand: is it possible to still use backreferences in block code?
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<Burgestrand>
pyoor: yes, but not by doing it how you did before. The first parameter to the block is the matched text.
<Burgestrand>
pyoor: inside the block, the magic global variable "current match" is also properly set, $~, which is a MatchData object containing information about the current match.
<havenwood>
siaw: Works for the one arbitrary example you gave.
<havenwood>
siaw: :P
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<siaw>
havenwood: haha ok :)
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<havenwood>
siaw: Or are you wanting to match the smartquotes too? If you do a gist with a bunch of examples I'm sure there's someone here who can't resist matching all of them.
<Burgestrand>
Like with Time.strptime!
* havenwood
likes the idea that the DB's timestamp has smartquotes
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<siaw>
i found a solution anyway thank you :)
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<havenwood>
siaw: Hopefully not Regexp-based!
<Burgestrand>
Hopefully using strptime!
<havenwood>
siaw: What did you go with?
<havenwood>
^
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<mghaig>
In an initialize method i'm trying to set an instance var to an argument only if it's a float and raise an argument error if it's anything else, is this valid ruby, when i run it in irb it always raises the error...
<mghaig>
@distance = distance if distance.is_a? Float else raise ArgumentError, "Distance must be a Float."
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<mghaig>
can it not be a one-liner?
<jhass>
better not
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<Burgestrand>
It's not more concise because it's on one line.
<apeiros>
mghaig: I prefer: raise TypeError, "Distance must be a Float" unless distance.is_a?(Float); @distance = distance
<Burgestrand>
More lines is not always worse code! Your code is beautiful, let it fly in all its glory.
<jhass>
replace the ; with a newline
<apeiros>
mghaig: but I'd question why you have that requirement
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<apeiros>
^5 jhass (despite different err classes)
<shevy>
the whole world is written on one line!
<mghaig>
ok thanks so much. i didn't consider the unless. and the type error is probably better for this case
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<jhass>
shevy: World.new ?
<Burgestrand>
I built a thing, https://github.com/elabs/serial, and I've been looking at some alternatives that solve the same problem, e.g. ActiveModel::Serializers, JBuilder, RABL. Are there any other popular alternatives that I've missed to have a look at?
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<Burgestrand>
(aside from building a hash and sprinkling if-statements)
<Burgestrand>
(I asked the same question in #RoR last week I believe, which gave me RABL, hadn't seen that one before.)
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<Burgestrand>
Sou|cutter: Thanks! I'm just on my way home now, so I'll have a thorough look tomorrow. :)
<shevy>
say you have such a logo http://shevegen.square7.ch/COOKBOOKS_LOGO.png ... does anyone of you know of a simple way to randomly alternate all colours, via ruby? (can use imagemagick/rmagick of course) I want to do so programmatically rather than manually
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<wallerdev>
def hi puts it on the object instantiated by that class
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<EmeraldExplorer>
wallerdev: Oh, I think I see. So is self like static in anyway?
<EmeraldExplorer>
BTW im referring to Java
<EmeraldExplorer>
... if you know about that language
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<deject3d>
no self is not like static
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<EmeraldExplorer>
deject3d: what is the difference?
<deject3d>
what is your understanding of static?
* baweaver
grabs popcorn
<EmeraldExplorer>
deject3d: static is a method of a class, not an object, and can be used from any other class ex: ClassName.method
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<deject3d>
and what about the context of variables?
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<deject3d>
yes you can use ClassName.method() on a static method named 'method' in your example.. but you know why, right?
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<EmeraldExplorer>
deject3d: because it is part of the class...
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<EmeraldExplorer>
deject3d: not an object
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<EmeraldExplorer>
Also one last question, how do I quickly do many def objectName.methodName s without repeating objectName? I know I have it in my notes somewhere but I can't seem to find it :,(
<pipework>
I've also rarely used them in procs for default_proc in hashes that were super short.
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<pipework>
But that's not a good reason
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<shevy>
EmeraldExplorer I actually don't use such short methods :)
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<shevy>
except for p object
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<pipework>
s/object/method/
<pipework>
Which is an object, a method object!
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<shevy>
pipemethod
<dfockler>
the classic ruby Method object
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* apeiros
still sad that UnboundMethod#bind does not accept just any obj as argument
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<dfockler>
has to be on the same class huh?
<apeiros>
or subclass, yes
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<dfockler>
Can't just slap methods onto classes willy nilly
<pipework>
Neither willy nor nilly should involved in the decision making process here.
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<broconne>
I have been trying to solve an issue for a while now.. Googled high and low.. Looked at a lot of different alternatives (including omnibusing a gem w/ ruby just to get around it). But I feel like I must be missing something obvious.. I have a gem I made.. every time I run it.. I get a warning about unresolved specs because multiple versions of gems exist on a system (I think). Is there a way to get around the warning? if I bundle exec, it works fine.. But
<dfockler>
broconne: that's what bundler is for
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<broconne>
dfockler.. I get that.. I guess. but is there really know way to create a gem and have it just be something people can execute? Or is that why chef has appbundler, omnibus, etc?
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<pipework>
broconne: Sure! You just have to use bundler's ruby interface.
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<pipework>
As early as possible in the invocation.
<broconne>
I mean, it does execute.. it just spits out a bunch of warnings that more than one gem exists.. kind of just want to shutup the warnings and have it pick one that matches my specs.
<broconne>
pipework. what do you mean, just setting it to an exact version like appbundler does?
<broconne>
its how I guess chef gets around this problem.
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<broconne>
but it generates an executable with a locked down list of gems.
<dfockler>
That's what your Gemfile.lock is for, so you have a set of dependent gems
<broconne>
but the Gemfile.lock doesn't get installed w/ a gem right?
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<dfockler>
no
<broconne>
like gem install doesn't generate a Gemfile.lock, right?
<pipework>
broconne: You'd make your gem have dependencies in the gemspec.
<dfockler>
^
<broconne>
pipework: I do..
<broconne>
then I build a gem
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<pipework>
broconne: If the gem is the app, the gem needs all the dependencies in the gemspec.
<broconne>
then someone else runs the gem that happens to have two versions of a dependency isntalled (I don't care which one gets used). and they get a warning message.
<shevy>
broconne normally a gem will just have a .gemspec, Gemfile* variants were introduced by bundler
<broconne>
yep.. i have a gemspec
<pipework>
broconne: When you say 'run the gem' do you mean that they call an executable that the gem ships with?
<broconne>
pipeowrk: yes call the executable
<pipework>
broconne: You can tab-complete nicks if your IRC client isn't terrible.
<broconne>
and when I do.. I get this:
<broconne>
WARN: Unresolved specs during Gem::Specification.reset:
<broconne>
ohai (~> 8.0)
<broconne>
but about 10 other gems listed
<shevy>
how do you get that
<broconne>
I run my gem executable
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<broconne>
which is generated by rubygems (according to the comment)
<pipework>
broconne: 'I run', as in direct invocation that looks like what?
<shevy>
not sure that pipework meant that
<pipework>
`my_gem_executable`?
<pipework>
`bundle exec my_gem_executable`?
<broconne>
my_gem_executable
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<broconne>
without bundle
<broconne>
after the gem is insalled with "gem install my_gem"
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<shevy>
this should require a bin/my_gem_executable file
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<broconne>
yes. I have my executable in there
<broconne>
and rubygems then seems to generate another one for me.
<shevy>
one with the shebang line changed I guess
<broconne>
that does the load, etc.
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<broconne>
mine doesn't have a shebang
<shevy>
as far as I know, only the top line is changed, are you sure that this will do the load instead?
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<broconne>
that is rubygems job I thought.
<broconne>
no, it generated a whole new thing
<broconne>
then does a load Gem.bin_path at hte bottom
<shevy>
it does not know what it should load, that is what the lib/ files should do, not the bin/ files
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<shevy>
huh... who added the Gem.bin_path thing
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<broconne>
gem install I am pretty sure does
<broconne>
that is why you specify your bin files in the gemspec
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<shevy>
I am pretty sure it does not
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<shevy>
yes, in the .gemspec file you specify what is to be part of your .gem
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<shevy>
but the bin/* files are or should just be commandline invocation variants
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<broconne>
ok.. so I lied.. I have a shebang in mine.. I do #!/usr/bin/env ruby
<broconne>
then some requires
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<broconne>
then I start (it uses thor)
<broconne>
but
<broconne>
the one that gets installed on the ssytem
<broconne>
in the path.. is purely generated by rubygems and just references mine.
<shevy>
what does it actually "reference" and how?
<shevy>
"When I use your library, deploy your app, or run your tests I may not want to use rubygems."
<shevy>
"When you require 'rubygems' in your code, you remove my ability to make that decision."
<shevy>
"I cannot unrequire rubygems, but you can not require it in the first place."
<shevy>
:D
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<wharr__>
have yall used the ruby debugger on sublime with vagrant before?
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<apeiros>
shevy: well, you still don't require 'rubygems' in your code :-p
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<broconne>
shevy: Wasn't suggesting that the content in the blog was good advice.. was just posting to an example of the executable that ruby gems generates.
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<shevy>
apeiros I can!!!
<apeiros>
sure. but you shouldn't
<shevy>
I don't :-)
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<shevy>
I am always trying to get rid of lines
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<shevy>
Not sure whether he did manage to resolve it
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<sship_>
I'm on Ubuntu. When installing gems, should I use 'gem install xyz' or 'sudo gem install xyz'? I have Ruby installed system-wide. I am not using RVM or anything.
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<tubbo>
sship_: does `gem install xyz` work?
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<zenspider>
if you're installing the gem to be used system-wide, use sudo. If not, flip a coin
<havenwood>
sship_: The default setup with the Ubuntu package manager Ruby is system-wide gems, so sudo.
<sship_>
tubbo: I didn't try it in case something goes wrong. Wanted to ask here first.
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<dfockler>
Is there a way to call a specific method in a ruby script from the command line?
<adaedra>
ruby -e ?
<dfockler>
oh yeah adaedra thanks
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<sship_>
When I install a gem to be used system-wide...will it conflict with other gems if I decide to use RVM in the future?
<adaedra>
sship_: rvm will have its own gem directory.
<havenwood>
sship_: Whether you use RVM or chruby or whatnot they don't care about your system Ruby.
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<sship_>
So I could have a gem system-wide and I could have the same gem in rvm's gem directory with no confliction, correct?
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<havenwood>
sship_: With your system Ruby you can also install gems in the user home directory instead of the system GEM_HOME like `gem install example --user-install` or more set it permanently for the user in a gemrc file.
<havenwood>
sship_: Yeah, sure, that's no problem.
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<sship_>
havenwood: Alright. Thanks!
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<zenspider>
drbrain: oi. my gem cert expired? does that mean I need to re-publish everything ever published with it? or?
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<drbrain>
this is the shitty unimplemented part of gem certs, "yes"
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<drbrain>
but you can't because rubygems doesn't allow re-upload
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<drbrain>
alternate solution, make your cert lifetime something ridiculous like 10 years
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<drbrain>
or make a CA cert that has a ridiculous lifetime, then a child cert with a short lifetime you use for signing
<drbrain>
then publish the CA cert
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<zenspider>
mmmm... you think I understand that shit. :P
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<drbrain>
nobody does
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<drbrain>
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<zenspider>
well fuck. republishing 90+ gems because of certs pretty much means: stop signing gems
<zenspider>
because that isn't worth it
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<drbrain>
convince people that want signed gems to pick up the TUF work since that's secure over the transport instead of inside the gem
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<zenspider>
gem cert --help doesn't mention anything about expiry
<dfockler>
write a gem to help publish the gems
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<zenspider>
already did that. still have to do 90 revs
<zenspider>
for nothing
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<drbrain>
if you don't use the strictest install setting rubygems won't check timestamps
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<zenspider>
how do I test a cert file?
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<zenspider>
looks like it moved the expired one to the side and generated a new one
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<zenspider>
also looks like I dealt with cert shit in june. this is getting stupid
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<dfockler>
to be fair, most of us don't have 90+ gems :P
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<zenspider>
dfockler: and? what's your point?
<dfockler>
I don't know
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<zenspider>
dfockler: then... good job contributing to the signal
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<dfockler>
:| sorry
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* baweaver
counts his gems
<baweaver>
20, need more gems...
<shevy>
push it, push it real good
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<gustav_>
Does anyone know of a place on the web to discuss and get input on implementation tactics?
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<gustav_>
For more open-ended questions than stack overflow allows..
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<dfockler>
So what's the point of a self-signed cert?
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<shevy>
see, I have not even reached that point, I don't even know why I need a cert
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<baweaver>
You'd be fine getting a band-aid from a random person claiming medical experience, but probably not with surgery without a validated doctor.
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<shevy>
I don't trust any doctors anyway!
<baweaver>
in some more important cases (Devise, CanCanCan, Pundit) you want to verify the integrity of the gem to a stricter level than you would with basic functionality helpers
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<dfockler>
It just says the gem code was written by the who the cert says it was written by
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<dfockler>
s/the who/the person who
<dfockler>
or who ever the private key belongs to
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<jimster>
will --disable-install-rdoc omit the rdoc gem from rubycore?
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<zenspider>
mmm... don't think so, but not actually sure what you're referring to
<jimster>
it's a configure option when building ruby
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<adaedra>
jimster: apparently not
<jimster>
the description reads like it results in skipping rdoc creation, and rdoc gem is included. but I hoped to confirm here.
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<zenspider>
jimster: "do not install neither rdoc indexes nor C API documents during install"
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<zenspider>
I'm guessing it has no effect on the installation of the gem
<jimster>
yea, that's what I was thinking as well
<zenspider>
I'll go a step further... I don't think rdoc IS installed as a gem
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<zenspider>
not a real one, at least
<adaedra>
jimster: my ruby is installed with that option, and I have rdoc.
<jimster>
that makes sense. I can't remove it
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<jimster>
thanks guys
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<nofxx>
Some change in load path or something in gem 2.4.8? Can't find my engines anymore...
<nofxx>
don't even remeber updating rubygems =/
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<havenwood>
nofxx: If you update your Ruby you get the RubyGems it ships with.
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<mwlang>
I just want to know how I can detect I called foo with |foobar|
<zenspider>
thanks
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<mwlang>
vs. just calling “foo”
<apeiros>
mwlang: block_given? tells you whether a block was supplied
<apeiros>
number of params the block takes would be block.arity. but using that is brittle at best.
<apeiros>
(and block.arity of course assumes &block in your method def)
<mwlang>
apeiros: hmmm…what makes that brittle?
<zenspider>
I'm... not sure what mwlang is asking still
<apeiros>
mwlang: thousand and one way you'll go wrong with it
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<shevy>
mwlang think of {} blocks are extra argument; you can use instance_eval and class_eval to do fancy stuff until you no longer understand what is going on (add method_missing for the extra-win... ok you already are not sure what is going on there :D)
<apeiros>
mwlang: also such kind of behavior is rather unexpected and will almost certainly confuse people using your code.
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<shevy>
Ruby tries to lure you with its wicked good looks but the cake is a lie.
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<zenspider>
mwlang: do you understand what |foobar| is in your code sample?
<mwlang>
heh…I confess I’m just trying to understand AA’s DSL better and how the heck they implemented it.
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<zenspider>
I'm still not sure these ppl are answering your actual problem
<mwlang>
zenspider: that’s precisely what I’m trying to understand.
<zenspider>
mwlang: you're not asking good questions. do you understand the exception that was raised?
<zenspider>
bring up irb/pry and try: nil.blah
<mwlang>
zenspider: I understand why, yes.
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<zenspider>
I'm asking more what, then why, at this point
<zenspider>
you got a NoMethodError
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<zenspider>
that's important to pay attention to
<mwlang>
zenspider: hold on. Let me come back with better questions.
<mwlang>
googling block and arity is getting me documentation I was seeking.
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<zenspider>
I'm not sure it is what you should be looking at at this point
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<mwlang>
zenspider: here’s what I’m trying to understand: Active Admin lets you define a column three ways:
<mwlang>
column :foo
<mwlang>
column :foo do |obj|; obj.do_something; end
<mwlang>
column do |obj|; obj.do_something; end
<zenspider>
ie don't try to tune an engine until you understand wheels and know how to inflate them
<mwlang>
all I want to understand is how that DSL was implemented.
<mwlang>
zenspider: ie. take an engine apart in order to understand how it works.
<mwlang>
:-)
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<zenspider>
my point: understand the basics before you get to advanced shit.
<shevy>
the method must exist
<zenspider>
I don't think you understand the absolute basics of blocks yet
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<apeiros>
mwlang: that one involves zero magic and even less so block arity checking.
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<mwlang>
sorry my gist took everyone down the wrong track and confusing everyone.
<apeiros>
I don't think that's what your AA example does. at all.
<mwlang>
the block.arity comment was all I needed to know about.
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<mwlang>
apeiros: AA is using defaults when they’re not supplied.
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<mwlang>
I just wondered, how the heck?
<apeiros>
your example doesn't show anything defaulty
<zenspider>
yeah. I suspect you're missing the point
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<apeiros>
it shows a method yielding a value to a block.
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<zenspider>
your code sample is confused how you're dealing with arity
<apeiros>
that AA thingy seems to be mostly just: `def column(name=nil); yield(noideawhat) if block_given?; end`
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<apeiros>
that is: it allows a first arg to be passed or omitted (arg with default value)
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<zenspider>
def column name = :default; yield some_obj if block_given?; end
<apeiros>
and it allows a block to be passed or omitted (yield if block_given?)
<zenspider>
that's all
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<mwlang>
but it also allows variables to be passed into the block to be used.
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<mwlang>
and that’s optionally supplied.
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<apeiros>
then your example missed the point of exemplifying your point
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<mwlang>
apeiros: yes, I realize that in hindsight
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<apeiros>
your AA example
<apeiros>
not your code
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<apeiros>
and I'm still not convinced block arity is what you want or need.
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<apeiros>
and *even if*, it's horrible code. don't do that. seriously.
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<mwlang>
apeiros: point taken
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<zenspider>
mwlang: it passes args in both cases, regardless of arity
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<mwlang>
for me, this was a thought experiment. My goal was to see if I could make both the arguments and the block arguments (or whatever you call the X and Y of “foo X do |Y|”) optional.
<mwlang>
it’s not really something I want to put into production code, but it was a good learning exercise, at least for me.
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<mwlang>
zenspider: I see now what you’re saying! d-oh
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<zenspider>
Are there any 1.8 folks left? Like, with actual numbers?
<zenspider>
drbrain: ^^ ?
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<darix>
zenspider: many of the enterprise distros still support 1.8
<darix>
and actually will have to for a few more years
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<darix>
that reminds me i have to writeup the bug report for rubygems and stdlib
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<shevy>
the land of the evil
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<drbrain>
zenspider: I stopped bugging Evan for numbers
<miah>
enterprise distros are stuck with backporting those fixes to ruby sadly. they made their bed, now they have to sleep in it.
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<darix>
miah: we would happily upgrade if any newer ruby would have been a drop in replacement :)
<darix>
trust me
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<miah>
upgrade the distro =)
<darix>
miah: sure done that.
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<darix>
but you know ... rhel/sles have like 10+year lifecycle now
<miah>
ya, but the versions with 1.8 are almost EOL
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<darix>
yeah
<darix>
in 4-5years they are ;)
<miah>
redhats fault
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<darix>
miah: for sles12 we set up the packaging to easily allow multiple ruby versions
<miah>
we've just stopped using the system ruby entirely
<miah>
cool
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<darix>
miah: if you keep maintaining the non system ruby it is all fine.
<miah>
during our packer/ami build we put chruby and our compiled rubies in place. now we're stuck supporting the versions of ruby on our systems, but at least we're not stuck with 1.8.7.
<miah>
infrastructure as code to the rescue =)
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<params>
hello everyone :)
<miah>
hi
<params>
can you help me with a quick question?
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<miah>
ask the question
<params>
I have a method like: .permit(:city, :country, :zip_code, :apt_number)
<params>
I want to pass the args as an array
<params>
what's the best way to do that?
<shevy>
no you don't have a method like this
<darix>
params: why?
<params>
i.e. I want something like args = %i(city country zip_code apt_number)
<params>
and be able to call .permit(args)
<shevy>
use *
<darix>
.permit(*args)
<params>
ah, does that unzip the array?
<params>
that's perfect
<params>
that's a lot!
<params>
;D
<params>
thanks a lot*
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<zenspider>
darix: I can always say that linux distros stuck on ruby 1.8 are stuck with older versions of minitest (or whatever). they stuck themselves. They don't get to stop upgrading some things and upgrade all the gems and expect it to work forever
<zenspider>
*%w[thanks a lot]
<darix>
zenspider: latest minitest doesnt work on 1.8 anymore?:p
<zenspider>
it does
<zenspider>
but I have a PR I like that'll require me to drop 1.8
<shevy>
\o/
<darix>
all that discrimination against 1.8!
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<darix>
zenspider: if it makes you feel better many projects broke compat before you :)
<shevy>
1.8 was cool but it is on life support!
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<miah>
1.8.7 has been EOL for more than a year at this point, its suprising anything still works with it
<havenwood>
shevy: Life support is for the living.
<havenwood>
darix: Ah, I hadn't seen that. Thanks for the link.
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<chrisseaton>
in my humble opinion they are making the same mistake as every other implementation of Ruby - they are optimising control flow and basic operations like ivars, instead of the core library where Ruby programs really spend their time
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<dfockler>
what kinds of things make ruby 'slow'?
<darix>
chrisseaton: but if you optimize the basics everything will be faster!
<darix>
i liked Aaron's talks on optimizing rails, rubygems and bundler^^
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<dfockler>
but it doesn't make things that much faster
<dfockler>
I'd imagine speeding up object allocation would be more important than 'if' branching or something
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<chrisseaton>
darix: unfortunately in my experience that just isn't true - it's like Amdahl's law - even if you make method calls, ifs, local variables etc infinitely fast, an MRI based implementation would be slow as their statically compiled C core library implementation is slow
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<chrisseaton>
dfockler: *removing* object allocation is what's key
<darix>
chrisseaton: my reply to you was sarcasm. sorry :)
<chrisseaton>
ah sorry :)
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<dfockler>
chrisseaton: reading through your article now :)
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<chrisseaton>
mwlang: right, and if the VM can not allocate them for you, even if they look like they're allocated in the source code, that's the silver bullet
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<mwlang>
chrisseaton: good point. yet another perk of using interpreted languages over compiled ones. You don’t think about garbage collection and you don’t think about heap allocation, either.
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<pipework>
But it's fun to be able to when it matters!
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<pipework>
Though I haven't really gotten as intimately familiar with chrisseaton's awesome work as I've been trying to.
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<fersur3>
Is there a way to set up a "full ruby environment" in $HOME/ ?
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<shevy>
fersur3 just compile ruby there
<finisherr>
Does anyone know where I can get a list of all of the options for rvmrc off hand?
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<pipework>
fersur3: ruby-install
<pipework>
chruby and ruby-install
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<pipework>
finisherr: rvmrc's are just files that are essentially exec'd if they're trusted.
<pipework>
last I used rvm that is
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<finisherr>
I know there are some options though
<finisherr>
like rvm_install_on_use_flag=1
<finisherr>
rvm_gemset_create_on_use_flag=1
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<finisherr>
I’td be great to know what environment variables are accessible to me
<pipework>
finisherr: #rvm is a thing. Why not just use ruby-install?
<finisherr>
ahh, i guess I could try that channel
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<pipework>
It's small, does the least amount of work necessary to do the job, and is easy enough to read the whole source in a single sitting.
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<finisherr>
I think there was a want for gemsets
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<finisherr>
and lots of folks use rvm already, don’t wanna push folks out of their tools
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<EasyCo>
Hey team, given the scenario where you have the following: Vehicle::Car.new(some_attrs). But you also have a wrapper/factory method which is part of the advertised public API: Vehicle.car(some_attrs). The latter does nothing special, it just proxies the values to Vehicle::Car.new(). Would you write test coverages for both ways of instantiating a car or just
<EasyCo>
one of them?
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<beauby>
EasyCo: I'd write a test that ensures the forwarding, and then test the constructor extensively
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