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<ddd>
ive got a vars file with var names like default[:foo][:bar] = "baz" and when i try to run erb -r vars.rb i get undefined local variable or method `default' for main:Object
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<ddd>
how do i make ruby not hate what i am trying to do?
<Ober>
default = Hash.new
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<ddd>
Ober so easy... thx!
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<hxegon>
hey all
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<hxegon>
have a OO design question. I have a model class Story, which I have to poll for updates, but the stories come from different sources (blogs, forums, etc.). Is it better to have #poll defined in modules, or have Poller objects which loads stories from DB?
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<hxegon>
or something else I'm not seeing
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<baweaver>
How does Enumerable work?
<baweaver>
What must you define in a class for it to work?
<baweaver>
Consider -able modules like Interfaces. Your class must implement a certain method in order to Interface with a Poller so to speak
<hxegon>
baweaver: ah, seems obvious now. thanks
<baweaver>
You _could_ use inheritance for it as well, but it's my preference to encapsulate shared actionable content instead of object structure
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<baweaver>
otherwise you end up with some really odd inheritance trees for no good reason
<hxegon>
yeah, there's no state for #poll to keep track of that stories don't already have
<baweaver>
I've also spent a good deal of time in Javascript lately so my habits have shifted a bit
<hxegon>
second question, how do I handle storing which pollable module a story is associated with in the DB? Store the pollable module name as a string?
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<hxegon>
It's straightforward, but want to double check that I'm not missing something obvious here
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<dminuoso>
baweaver | [06:20:32] I've also spent a good deal of time in Javascript lately so my habits have shifted a bit
<dminuoso>
Haha, I know the feeling.
<dminuoso>
The liberty at which I create lambdas these days is incredible.
<dminuoso>
Though I think Haskell has influenced me even more.
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<Bish>
hello, how would i search with xpath in the default namespace only?
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<Bish>
(nokogiri)
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* dminuoso
pokes Bish with css selectors
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<dminuoso>
Bish: Based on what Im seeing, it looks as if you could do //*[local-name()="Foo"]
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<Bish>
dminuoso: googled that too, doesnt quit work
<Bish>
or rather.. what is "Foo" in that context, the node name?
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<dminuoso>
Bish: Zeah
<dminuoso>
Yeah.
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<Bish>
dminuoso: well, what i want to have all in default namespace
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<sylario>
If have wrapper function def wrapper(a,b,c,d) final_call a,b,c,d end
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<sylario>
is there a way , without a lot of if to sometime call wrapper a,b and soemtime call wrapper a,b,c,d ?
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<sylario>
c and d are optionnal parameters of final_call
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<pppktz>
Hi guys, I was wondering if it possible to run ruby code without installing Ruby just using the downloaded binaries for ruby 2.3.5?
<pppktz>
on a windows machine
<ineb>
sylario: yes, there are quite some ways to do it. for example initialize c and d with nil def wrapper(a, b, c = nil, d = nil)
<sylario>
ineb: yes but final call will be finall_call a,b,nil,nil?
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<sylario>
i currently do it ith a "if c && b; finall_call a,b,c,d"
<sylario>
But I was wondering if there was something more elegant
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<ineb>
sylario: sure, make wrapper take variable arguments and pass those to final_call. def wrapper(*args); final_call *args; end
<sylario>
I knew I was missing something
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<sylario>
thanks ineb
<ineb>
sylario: to make it more clear that a and b are necessary, you can explicit list them as paramters, def wrapper(a, b, *rest); final_call a, b, *rest; end should work imho. havent tested it
<dminuoso>
Though I'd argue that if you curry your funciton, you should absolutely not use optional arguments anymore.
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<dminuoso>
sylario: In my opinion (and this has been greatly influenced by functional paradigms), if you have two styles of invoking a functions with different amount of params, make two functions (or methods)
<sylario>
It's my only call to render in an API
<dminuoso>
Especially if the "extra args" have special meaning.
<sylario>
sometimes i want to be more specific about the serializer, especially when I raised AR exceptions
<dminuoso>
sylario: use an option hash instead.
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<dminuoso>
sylario: it's also much clearer on caller site what you are passing.
<ineb>
or maybe just an argument with default serializer which can be overwritten
<sylario>
well, it's not really called, i Use only ! to save and I catch exception, in another shared concern
<dminuoso>
You tell me which one is more maintainable.
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<sylario>
anyway my design is never final, and I'll probably end up with a collection of function in the concern where the render is done
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<sylario>
I'll keep all of that in mind, thanks a lot for the lesson dminuoso
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<pppktz>
thanks, I will try it
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<mikecmpbll>
are there any tools for helping locate and reduce peak memory usage in a ruby program?
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<xixo>
Hi. I'm using VCR to record fixtures, but I'm worried about checking them into version control because it seems they contain sensitive information. What is common practice to deal with this?
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<havenwood>
mikecmpbll: There are a variety of tools. One thing I do as well is use jemalloc, which can really help keep things flat.
<havenwood>
mikecmpbll: You can just compile Ruby --with-jemalloc, if you aren't already.
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<RickHull>
a proc is a proc. what do you mean the value of a proc?
<RickHull>
you mean the result of calling it?
<matthewd>
andywww: I see neither a proc or a [relevant] array
<andywww>
the return value of the proc once it is called
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<andywww>
i would like the return value of make_request method to be whatever is returned from the handle response method once it has called the relevant handle_* method
<andywww>
I’m just not sure how to go about it
<RickHull>
def foo; proc { |a, b| a * b }; end; def bar(a, b); proc { |a, b| a * b }.call(a, b); end
<RickHull>
foo returns a proc; bar returns the result of calling the proc
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<andywww>
i understand i need to call it but its the return value of make_request i’m struggling with in this instance
<RickHull>
i think you are talking about blocks rather than procs, but it shouldn't make much difference
<matthewd>
RickHull: Did you look at the gist?
<RickHull>
what is the return value of request.on_complete ?
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<andywww>
quite possibly but as it stands, make_request is returning an array with a single proc
<RickHull>
yeah, I don't see procs either
<andywww>
its the behaviour of typhoeus from what i understand
<matthewd>
andywww: make_request is returning the result of request.on_complete. You probably don't want to do that.
<andywww>
yes thats right exactly
<andywww>
i want to return the result of the handle_response line inside the block
<RickHull>
you can make a temp var above the block, assign to it inside the block, and return it
<RickHull>
but that's kind of gross
<matthewd>
You're not using the Typhoeus API correctly.
<andywww>
i was starting to think that
<andywww>
what are the immediate errors?
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<matthewd>
You're returning the result of request.on_complete. You probably don't want to do that.
<andywww>
ah shit
<andywww>
i removed a line in my faffing about
<andywww>
the top method now calls request.run
<andywww>
which is making it follow the links as expected
<RickHull>
you might have a more composable API if you return the request without running it
<Guest72603>
does lrth drill core oo concepts?
<Guest72603>
s/lrth/LRTHW/
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<RickHull>
Look Rob That's a Heavy Walrus?
<Guest72603>
RickHull: you read my mind ;)
<RickHull>
Learn Ruby The Hard Way
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<RickHull>
in learning ruby, I've rejected many core oo concepts
<RickHull>
depending on your definition of core oo concepts
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<RickHull>
basically: don't hide private state so much as minimize it
<RickHull>
it's very easy to get cute with instance methods that spaghettify the data flow
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<Guest72603>
RickHull: thanks. I'll keep those things in mind for sure.
<RickHull>
haven't read LRTWH though :)
<Guest72603>
:)
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<Guest72603>
i did the codecademy course three times in three two years, finally took notes the last time. then i just started doing projects in ruby. i want to write good ruby though. so i'm going to work through some of the recommended books; i could stand to get some more practice using the oo paradigm
<Guest72603>
but tbh i'm more interested in the reflective and functional parts
<matthewd>
The only thing I know about LRTHW is that it teaches """foo""" as a special string syntax -- that's also all I feel I need to know :|
<elomatreb>
btw, you'll find that many Ruby styleguides discourage the use of the that particular style, most recommend using Kernel#format as it's probably the most clear
<RickHull>
>> "a b c d %s %s %s" % ['e', 'f', 'g']
<cagomez>
what does this regex do? "124-324".strip =~ /\A\d+-\Z/
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<RickHull>
elomatreb: interesting, I haven't looked at Kernel#format
<elomatreb>
It's just an alternative name for sprintf, same method
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<elomatreb>
As "sprintf" is a non-obvious C-ism
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<RickHull>
i do agree, the % syntax is impenetrable
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<waveprop>
i avoided it until i learned c
<elomatreb>
cagomez: \A and \Z anchor to the beginning and the end of the string respectively, \d+ means "one or more digits [0-9], and the - is a literal dash used like that
<waveprop>
but then it was the easy part, lol
<RickHull>
waveprop: I don't mean the format strings
<waveprop>
oh, my bad.
<RickHull>
i mean str % var
<elomatreb>
FWIW that's the idiomatic way to do string formatting in Python, afaik
<RickHull>
versus format(str, var1, var2 ...)
<waveprop>
i see now
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<waveprop>
can hashes be used with set operatiors
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<RickHull>
more or less. ruby's Set is implemented with a hash, I believe
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<RickHull>
a ruby Set is effectively just the key portion of a Hash
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<elomatreb>
One thing you should know is that much of what we tend to call operators aren't actually operators, they're just methods on the "operands". Like `a + b` is equivalent to `a.+(b)` in Ruby
<RickHull>
havenwood: what's the point about set.class ?
<RickHull>
er, Set.class
<elomatreb>
E.g. the "Set operators" do something completely different on numbers, for example.
<havenwood>
RickHull: To show with code that it's a Class not Module.
<RickHull>
oh, it's a class, not a module :)
<havenwood>
yup!
<waveprop>
Nice. that's interesting a.+(b)
<RickHull>
array assignments like `ary[5] = 3` are defined like `def []=(val)`
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<RickHull>
er, def []= (idx, val) # ?
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<waveprop>
I did notice that i was getting 'no method error: []' at ane point
<waveprop>
and i realized ruby has been very thoughtfully designed
<ahurst>
Hey all, total ruby newb here, trying to install some software that requires a bunch of gems being installed using bundler, and I realized after installation I need to reinstall one of them with different compile flags. Is this something that's easy to do?
<RickHull>
make install # not heroin
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<waveprop>
haha
<ahurst>
It's installing in deployment mode, so not at a system level
<ahurst>
I know how to add the compile flags with bundler already, I just don't know how to tell it to reinstall one of the gems
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<RickHull>
ahurst: do you have an example showing the install with different compiler flags? e.g. `gem install foo ...`
<RickHull>
ahurst: oh, in that case, add the compile flags and something like bundler install or update should take care of it
<ahurst>
ahh update, I'll try that
<ahurst>
thanks!
<RickHull>
i'm just sort of guessing
<RickHull>
i haven't used bundler in a while
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<waveprop>
where do i start with unit testing
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<waveprop>
rspec? minitest?
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<waveprop>
a book on tdd?
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<RickHull>
I'm partial to minitest and minitest/spec over rspec
<RickHull>
but rspec has a lot of mindshare
<waveprop>
okay
<elomatreb>
RSpec and Minitest are just two concrete frameworks/environments for testing, you'll want to understand the more abstract concepts of testing. But I don't have a good resource either
<waveprop>
okay elomatreb, i'll stfw for broad concepts
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<RickHull>
I like the idea of TDD but generally write a code spike (prototype) first, then tests, then refactor
<waveprop>
RickHull: is minitest more, i don't know, minimalist? than rspec
<RickHull>
yes
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<waveprop>
rad, i'll probably like it then
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<waveprop>
i watched some videos about using the ruby debugger and also that static analyzer.. i think it's called invade? nah, i dont remember, but its a repl which allows you to probe the state of objects at a given point with no stepping
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<waveprop>
thanks RickHull i'll take a look there
<RickHull>
irb is the standard repl; look at pry for a much nicer repl
<waveprop>
pry is the one
<waveprop>
thx
<waveprop>
i do love irb
<SeepingN>
there's wirb/wirble
<SeepingN>
not as powerful as pry
<waveprop>
but someone mentioned a gem which lets you switch between pry and ruby debugger, i think it was called pry-dubug or similar
<elomatreb>
RickHull: Personally I don't like the monkey-patched test method (a.must_equal b), IMO the expect(a).to eq b syntax is much cleaner, if we're talking about Minitest/RSpec
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<waveprop>
SeepingN: i'll look at it, thanks
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<RickHull>
elomatreb: I see your point, and I think minitest/spec had a much bigger win over prior versions of rspec
<RickHull>
but I prefer the minitest tradeoff here
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<RickHull>
i think the downside is only in pure theory, not practice
<elomatreb>
It's definitely noticeable in the speed, I use RSpec due to getting used to it before I got used to Minitest, and it tends to get very slow very quickly
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<matthewd>
Yeah, it's not terribly fair to blame minitest/spec for the syntax it copied from rspec (I think) largely to make a point :P
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<RickHull>
having to learn and grok the rspec DSL, given minitest/spec, is more of a burden, aside from performance or purity
<RickHull>
and rspec itself was a huge win imho over test/unit or whatever
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<waveprop>
so ancestry is test/unit > rspec > minitest/spec, with the last two feeding back
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<RickHull>
minitest became the implementation of test/unit in ruby 1.9 IIRC
<RickHull>
(before minitest/spec)
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<RickHull>
then rspec came around and the DSL appealed to lots of people, rails in particular IIRC
<RickHull>
then minitest/spec did 80% of rspec in 20% of the code (or something)
<waveprop>
woah
<RickHull>
and much less processing overhead
<RickHull>
and it pushed a lot of improvement from rspec
<elomatreb>
The "conventional" style with the test_* methods was borrowed from and is the norm in many other lanugages
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<waveprop>
elomatreb: okay good to know
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<RickHull>
nunit, junit, etc
<waveprop>
i have always stopped after writing nearly each function and tested it out, in shell scripts. isnt that the general idea with unit testing, except you write code to automate the test for each thing you add
<waveprop>
i see
<RickHull>
yep, just a formalization that leads to easy automation
<RickHull>
a big win
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<waveprop>
thats a great idea
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<elomatreb>
And once you are testing individual methods like that, you can move on to test groups of methods/functionality pathways, "integration testing"
<RickHull>
you can then do a code coverage measurement
<RickHull>
see if you have any untested branches
<waveprop>
this is really cool you guys
<waveprop>
do these frameworks have the functionality to do integration and branch / coverage testing as well?
<RickHull>
no, that's generally a separate package, e.g. simplecov gem
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<waveprop>
okay nice
<RickHull>
once you have automated tests, then you can enable e.g. Travis CI
<waveprop>
there is a lot of cross over here with fuzzing etc
<RickHull>
and every push to github triggers a test run
<elomatreb>
You don't *need* any of this hosted stuff though, a simpler, free alternative would just be running the tests in a git pre-commit/pre-push hook
<elomatreb>
(Locally of course)
<atmosx>
waveprop: pry-byebug?
<waveprop>
RickHull: thats really cool! i'll mess with travis
<cagomez>
is there an easy way to check if an array is flat?
<waveprop>
elomatreb: i use a local git server, now i have a reason to learn about pre-commit hooks
<RickHull>
ary.all? { |i| !i.is_a?(Enumerable) } # the hard way
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<RickHull>
something like that. you could test if ary.flatten == ary i guess
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<cagomez>
say I do foo + bar and bar may be an array of arrays. is the final array flat?
<waveprop>
atmosx: sorry, i'm not sure of the gem's name. it was mentioned in passing by someone in the audience at a con-talk in a youtube video i saw
<elomatreb>
ary.grep(Enumerable).none?
<matthewd>
`ary.grep(Array).empty?` is more accurate
<atmosx>
k
<matthewd>
Flatten only flattens arrays, not all enumerables
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<elomatreb>
And flatten is recursive and will finish the entire array, if you just want a yes/no answer you can return false upon hitting the first non-flat element
<RickHull>
cagomez: the resulting array will not be flat, I believe
<RickHull>
cagomez: but irb or pry is a great way to TIAS
<RickHull>
it's better to investigate on your own before looking up the answer in the back of the book ;)
<waveprop>
elomatreb: what do you use for integration testing
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<elomatreb>
You don't need any special software for integration testing (as an abstract concept), it just means testing entire high-level groups of functionality in addition to testing the individual methods
<waveprop>
okay thanks
<elomatreb>
In the context of web applications (e.g. Rails) you do see things like headless browsers being used though, basically simulating a user interacting with the application to test at a high level if everything is working
<waveprop>
elomatreb: okay cool. yes i do that with curl
<baweaver>
flat_map ?
* baweaver
needs to read more context
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