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<Cope>
Hi... I've not done any Ruby for 2.5+ yrs; new mac; new job: are chruby, ruby-install, rbenv etc still things? What's the current recommended way to install and manage Rubies on a mac?
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<dminuoso>
Cope: ruby-install/chruby
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<dminuoso>
Cope: You can skip the latter if you dont need multiple versions.
<dminuoso>
But you can also build it from source yourself, there's really not much to it.
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<dminuoso>
Cope: Though since high sierra you get a relatively new and recent version of Ruby that is fine.
<dminuoso>
So you dont have to if you dont want to.
<dminuoso>
It's some 2.3 version I think
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<dminuoso>
Though keep in mind that 2.4 introduced API breaking changes for basically every native extension out there.
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<dminuoso>
So that's a good reaason to not stick with the macOS supplied Ruby.
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<Cope>
yep the stuff I'm working on is 2.4
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<Cope>
ok great, thanks dminuoso
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<guardian>
I have text file in which I have "groups of lines separated by an empty line". Is there an idiomatic way of converting that into an array of arrays of strings?
<guardian>
I thought I messed the file name but File.exists?('dupes.txt') returns true
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<guardian>
thanks al2o3-cr and tbuehlmann, IO.foreach('dupes.txt', "\n\n") { |lines| lines.split } works for me. It gives me an array of strings at each top level iteration
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<al2o3-cr>
yw guardian
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<chridal>
I have a 'server' that I've implemented, that's basically a for loop polling AWS SQS. I want to be able to test this with RSpec. If I start my server by running the `server` method, though, I'm not really able to stop it without doing CTRL-c
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<chridal>
while loop **
<chridal>
So my question is; how should I go about controlling this? I probably need some sort of wrapper around the whole thing, that will allow me to stop and start the server or something? A new thread?
<chridal>
I will have to daemonize this at some point, and I really dont' want to mess too much with PID files etc.
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<bngsudheer>
Can I ask a question about installing ruby gem?
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<dminuoso>
bngsudheer: Yes.
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<leitz>
Beats asking a question about asking a question. We seem to be a questionable lot...
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<FrostCandy>
ya it seems to work but i'm trying to send it in an http::post which I guess can't seem to send the data field as an array
<FrostCandy>
request.set_form_data(d) fails i think
<FrostCandy>
i'l have to look into it
<chridal>
I'm trying to stub out a class (RestClient) in RSpec. Is it possible to 'replace' the RestClient for that file (which is deeply nested beneath this call), or do I have to do dependency injection?
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<chridal>
I'd rather not inject the dependency, because I'm doing an integration test, and the use of RestClient is 4-5 files away from my current call
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<hdb2>
hello - new to ruby, I am trying to open a file using whatever editor the user has set in their env. I came up with system("#{ENV['EDITOR']}, file) from google, but this throws an error. can someone point me in the right direction?
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<hdb2>
it appears that I can call the editor by name, e.g. system('vi', foo) but I'd like to generalize it
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<zmo>
hdb2 - you need to have the $EDITOR env variable set up before you run your script
<zmo>
it's often the case, but it's not always the case
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<elomatreb>
And it needs to be exported of course, try just debug printing ENV and see if it's there at all
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<hdb2>
zmo: understood. if I have that variable set (say, in my .bashrc), is system what I need to use to open the file with $EDITOR or something else?
* dminuoso
does some smalltalk with elomatreb
* dminuoso
sends elomatreb :hi
<elomatreb>
:hello
<dminuoso>
Oh goodie!
<zmo>
hdb2 - launch irb
* dminuoso
sends elomatreb :launch_nukes
<zmo>
and then run system(ENV['EDITOR'])
<zmo>
and you'll see
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<elomatreb>
dminuoso: :pew_pew
<hdb2>
zmo: I'll dig into that - thank you for the help!
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<zmo>
damn… rails is driving me crazy… I'm running it in docker-compose, I do docker-compose --build up -d, it's working fine, but if I do docker-compose run web rails generate migration fubar, shits hits the fan saying about one of my deps: 'Could not find kaminari-core-1.1.1 in any of the sources' but it's there and the code works, bloody !@#$
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<dminuoso>
zmo: That does not sound too surprising.
<alex``>
so node = new(identifier: hash[:identifier], value: hash[:value])
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<alex``>
havenwood: That slice!
<alex``>
Thanks
<alex``>
By the way, if I had to create helpers methods, like this one, where to put them?
<alex``>
I have a Node class in lib/node.rb
<alex``>
It is best to put at the bottom after `private`?
<alex``>
or a new file
<zmo>
dminuoso - why did you ask about the Dockerfile? any hint there?
<alex``>
and if a new file, how to organize the code
<alex``>
zmo: = guyzmo?
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<dminuoso>
zmo: Oh sorry didnt see you already posted it.
<zmo>
alex`` - indeed
<alex``>
:)
<zmo>
dminuoso - no problem :)
<zmo>
alex`` = alex` ? :)
<alex``>
\_o<
<havenwood>
alex``: Sure, you can always define a private method that acts as a function with the hash as the first argument. Other options include extracting it to a module with module_function, or using a refinement.
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<dminuoso>
zmo: You need an additional layer I think.
<havenwood>
alex``: Just avoid globally m̶o̶n̶k̶e̶y̶ freedom patching the core class of Hash.
<zmo>
dminuoso - what do you mean?
<dminuoso>
zmo: The topmost layer does not have the bundle installed.
<dminuoso>
Since that's your RUN command
<dminuoso>
Or.. Im not 100% sure about this. But I think it might not work.
<alex``>
havenwood: Yep I was tempted to do def Hash.pick or something
<dminuoso>
zmo: Nevermind, Im not quite clear headed.
<alex``>
but figured it was a bad idea as it can conflict with the code of other
<dminuoso>
zmo: So let me just ask this. Why are you trying to generate a migration inside the docker container at all?
<havenwood>
alex``: A refinement lets you safely limit the scope of such a change.
<dminuoso>
zmo: (The reason I got confused is because I thought you actually ran "bundle install" as your CMD since it was at the bottom. Then pure mimicry just repeated RUN.
<dminuoso>
Which confused me slightly.
<baweaver>
Refinements are weapons of a more civilized age
* dminuoso
hands baweaver his lightrefinement
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<dminuoso>
baweaver: Outside this channel Ive yet to see them anywhere.
<baweaver>
(honestly same here)
<dminuoso>
They are like flipflop. We all itch to use it but nobody seems to know what it is.
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<zmo>
dminuoso - well, it's all working fine, except when I run a rails command where it complains I don't have a dependency installed
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<zmo>
dminuoso - ah, missed your question
<dminuoso>
zmo: that means its not picking up the bundle. its possible the binstub might not work depending on the further details of your docker container
<dminuoso>
zmo: try running it through `bundle exec`
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<zmo>
dminuoso - well, TBH, it's because it's how I've been told how to do it
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<zmo>
and because I don't have the rails stuff configured configured the same locally
<dminuoso>
zmo: Just out of curiousity, try running `bundle exec rails ...` instead of raw `rails`
<dminuoso>
Somehow I expect that to work.
<zmo>
*AH*
<dminuoso>
zmo: If that works, add a "rehash" CMD.
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<dminuoso>
See if that allows the rails binstub to function
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<dminuoso>
Or just live with `bundle exec`
<zmo>
docker-compose exec web bundle rails generate migration
<dminuoso>
zmo: essentially when you run `rails` commands inside a bundler directory, the binstub detects it, and ends up doing something similar anyway.
<zmo>
you mean outside of the docker ?
<dminuoso>
well
<dminuoso>
docker-compose exec web bundle exec rails generate migration
<dminuoso>
you were missing the "exec" command for "bundler" there
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<zmo>
ah
<zmo>
double exec
<zmo>
my bad
<dminuoso>
One is for docker-compose, the other is for `bundler` ;)
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<zmo>
too many execs :)
<dminuoso>
zmo: That being said, is there a reason you generate migrations inside a docker container?
<zmo>
ok, with the too many execs, still same issue
<zmo>
it's because my local environment is not configured
<zmo>
and I'm not even running the same ruby outside of the docker than from within
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<zmo>
(maybe I should upgrade, though)
<dminuoso>
zmo: so what?
<dminuoso>
zmo: just generate the migration outside, and then rebuild from that layer
<zmo>
and it's also because it's how I've been told to do stuff, and it was working up until now
<havenwood>
alex``: That's an example of backporting Hash#slice with a refinement.
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<alex``>
havenwood: What is for back-porting?
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<dminuoso>
zmo: I wonder, what does your docker-compose.yml look like?
<havenwood>
alex``: Hash#slice was introduced in Ruby 2.5. If you'd like to implement it yourself, that's ^ an example of how to do it with refinements.
<alex``>
Oh oki
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<alex``>
Always use the Ruby head version :p
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<alex``>
havenwood: You know the Ruby equivalent of JavaScript to construct hash from variable names?
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<alex``>
In JS: a = 1; b = 2; { a, b }; # => { a: 1, b: 2 }
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<zmo>
WA9ACE - I'm coming from python+flask, so I totally hear you
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<WA9ACE>
I like Flask too
<havenwood>
<3 Roda
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<dminuoso>
zmo: Trailblazer is really great :)
<dminuoso>
zmo: Which of their libraries are you using?
<dminuoso>
WA9ACE: I found too much time in Rails is spend figuring magic DSL, filters, magic callbacks, more DSL - and then some more to accomplish goals
<dminuoso>
When instead you could have just written code to solve the problem.
<zmo>
dminuoso - I'm still discovering, so it's only the basics
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<dminuoso>
zmo: No I meant like, are you using cells? formular? operation? representable?
<WA9ACE>
dminuoso I don't disagree, however at the moment I'm bootstrapping a new rails app for work with devise and activeadmin
<zmo>
mostly the raw trailblazer stuff (step/success/failure) and the formal validation API (which I think is from DRY)
<WA9ACE>
took all of 30 minutes
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<zmo>
well, the tragedy in my code is that I inherited it as it was like 6kLOC, with a huge schema (about 13 tables) some with 5× n-ary associations
<zmo>
and NOT A SINGLE FSCKING BL**DY TEST !@#$
<WA9ACE>
I feel for you there
<zmo>
and I knew very little of ruby and rails
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<WA9ACE>
sometimes I feel like people started with rails and never learned how to normalize a schema
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<zmo>
so I spent like 4 months trying to stop the bleeding, and now I'm preparing for the future, which means rewriting everything through trailblazer
<zmo>
dminuoso - about trailblazer, I think it's only operations
* apeiros
drops "polymorphic association", waits for WA9ACE' reaction
<apeiros>
zmo: 13 tables isn't even close to huge. sorry.
<WA9ACE>
there's also that ^
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<WA9ACE>
last large product I worked on (Play framework/Scala) was 56 tables
<zmo>
it's all relative
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<zmo>
for a simple booking system it's huge
<zmo>
it should be half of that
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<apeiros>
"unnecessarily big/complex" then
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<apeiros>
and yes. rarely seen software which isn't.
<zmo>
apeiros - you're loosing the frustration of the exageration
<WA9ACE>
a smart man learns from his own mistakes, a wise man learns from the mistakes of others
<WA9ACE>
people using polymorphic associations will learn from the former
<apeiros>
and idiots think they make no mistakes
<WA9ACE>
^
<Yxhuvud>
56 tables? large? heh.
<apeiros>
of course, I'm the exception 🤪
<WA9ACE>
`rescue ApeirosEx => e`
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<apeiros>
what do you want to do with my Ex?
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<WA9ACE>
when people say "ace why don't you write tests?" I just tell them I don't write bugs
<WA9ACE>
only features
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<WA9ACE>
nice little bitey bug shaped features
<apeiros>
you're tame.
<WA9ACE>
just kidding, I write tests
<WA9ACE>
sometimes
<apeiros>
I push them against the wall, elbow in their throat: "WHAT?!? Are you saying my code was buggy?!?"
<WA9ACE>
I was going for the Bob Ross style
<zmo>
tests are for loosers
<WA9ACE>
we only make happy little bugs
<dminuoso>
tests are for people without type checkers.
<dminuoso>
oh wait..
* apeiros
writes far too few tests :(
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<WA9ACE>
ah yes, because we've never written bugs in statically typed languages
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<banisterfiend>
apeiros yo
<apeiros>
oy banisterfiend
<banisterfiend>
apeiros have you ever written tests for stuff that touches the file system? what's your approach?
<banisterfiend>
i'm struggling
<apeiros>
banisterfiend: actually I have
<apeiros>
2 approaches
<banisterfiend>
my approach has been rewriting the class so that it can deal with a super minimal number of files, writing those to a temp folder, and then explicitly checking the file system
<banisterfiend>
but those aren't strictly unit tests
<apeiros>
there's fakefs/mockfs (not sure about the name anymore)
<banisterfiend>
oh ok
<apeiros>
and the other approach was that I used a directory within the test-dir
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<apeiros>
but the latter only works if you can restrict your stuff to relative paths
<zmo>
anyway, calling it a day
<zmo>
thank you 🙌
* zmo
&
<banisterfiend>
apeiros nice
<banisterfiend>
apeiros how flakey is fakefs though?
<apeiros>
no idea
<apeiros>
been a while since I used it, and that wasn't much either
<banisterfiend>
i'm finding it kinda difficult, and *really* dont want to stub out FileUtils and the 'system' call, heh
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<ineb>
i used fakefs once but ended up with using tmpdirs for fs related tests
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<baweaver>
banisterfiend: I found binding_of_caller
<baweaver>
and I tried to do something very bad with it
<banisterfiend>
baweaver lol
<banisterfiend>
yeah it allows some very naughty stuff
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<garyserj>
is it true that in ruby, a class is a constant, or is that rubbish? somebody told me that a class is a constant. I also found a book on google books that says "in ruby, a class is an object. The name of a class is a constant that points to an object"
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<apeiros>
garyserj: a class is not a constant, it's an object. but almost all classes are referenced by a constant.
<apeiros>
garyserj: does that answer your question?
<garyserj>
i'll have to note down what you're saying and think about it, to fully understand it, but yes.
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<garyserj>
I can't see how a class can be a constant anyway so if you says it's not, that's fine!
<apeiros>
constants are a type of variable
<apeiros>
variables and objects don't mix. they are different categories of things.
<apeiros>
variables reference objects. they themselves aren't objects.
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<apeiros>
Constant, $global, @instance, @@class, local - those are the 5 types of variables ruby provides. all of them can reference objects.
<apeiros>
however, you don't need variables to have objects. take this code: `"hello".upcase` - no variable in there. the string "hello" is called a literal, because it's literally in the code.
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<garyserj>
is it possible that a class name is a constant?
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<garyserj>
i know you can't change a class name
<apeiros>
colloquially speaking, yes. i.e. if you mean by that "using a constant to reference a class". most classes are that way, and the `class Foo` syntax only works that way.
<apeiros>
being pedantic, I'd say the class name is a string, as that's what Class#name returns. and it may or may not be related to the constant used to reference the class.
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<apeiros>
e.g. `Array` is a constant referencing the core Array class.
<garyserj>
apeiros: ok so that's the case with Ruby, is it the case with other languages like C# or Java?
<apeiros>
other languages work differently.
<garyserj>
'cos i've never run into that in C# or Java.. it seems peculiar to Ruby.
<garyserj>
ok
<apeiros>
and I think neither in C# nor Java are classes objects
<garyserj>
that's right
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<apeiros>
classes being objects makes a lot of things pretty easy, though. it means you can pass them around like anything else.
<weaksauce>
can you monkeypatch in those languages?
<apeiros>
23:07 apeiros: constants are a type of variable
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<garyserj>
identifier is the general term. an identifier can be a constant or a variable.
<garyserj>
in computer science anyway, afaik.
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<apeiros>
identifier is a vague term meaning wildly different things to different people.
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<garyserj>
can you give me an example? i've never heard it used differently to how i've known it to be used.
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<apeiros>
tell me what kinds of identifiers you know in ruby
<garyserj>
I don't know ruby well enough but I could give you example in a language like c#
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<apeiros>
so there it starts already…
<garyserj>
what do you mean?
<garyserj>
even compilers use the term identifier. like "unknown identifier".
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<garyserj>
which i think pascal would say.
<apeiros>
ok. yes, constants are identifiers.
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<jeffreylevesque>
is `make` a ruby command?
<WA9ACE>
make a build tool
<WA9ACE>
not specific to ruby
<WA9ACE>
it's been around probably twice as long as ruby has
<jeffreylevesque>
what do i need to install to have `make build`
<WA9ACE>
what platform?
<jeffreylevesque>
windows
<jeffreylevesque>
but, i want to generalize it
<jeffreylevesque>
so it can be run on linux too
<jeffreylevesque>
i'm writing a script to install rancher-compose
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<garyserj>
What is the difference between the object Array, and the object Array.new ?
<WA9ACE>
sorry, last time I did Ruby on Windows that wasn't under the WSL it was absolute hell
<jeffreylevesque>
ah ok i think linux already has `make`?
<jeffreylevesque>
so, i just need a workaround for windows
<WA9ACE>
jeffreylevesque it depends
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<WA9ACE>
some debian platforms you'll need to do `sudo apt install build-essentials` or similar
<garyserj>
jeffreylevesque: cygwin would very likely have 'make'
<garyserj>
but you'd need linux and maybe 'c' skills to use make.
<WA9ACE>
with Fedora it's `sudo dnf groupinstall "C Development Tools and Libraries"
<garyserj>
linux=linux skills
<apeiros>
garyserj: Array is the class, Array.new is an instance of that class, an actual Array
<jeffreylevesque>
if install cygwin, so i have to use a special shell terminal window to use the command?
<garyserj>
jeffreylevesque: perhaps you won't have to. The vast majority of cygwin commands maybe all even, I can use from regular cmd
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<garyserj>
jeffreylevesque: If they have an EXE extension they work outside of cygwin. Very few commands you can run from the cygwin shell don't have an EXE extension
<garyserj>
for example ssh.exe can run from outside cygwin shell not just inside cygwin shell.. but a weird case, one of the view commands that only runs inside the cygwin shell and not outside of it, is ssh-copy-id which notably has no exe extension!
<garyserj>
view=few
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<jeffreylevesque>
i'm installing cygwin
<garyserj>
good move!
<jeffreylevesque>
i hope that doesn't mean i have to run their special shell window
<garyserj>
i told you it doesn't
<jeffreylevesque>
oh ok
<jeffreylevesque>
thanks!
<garyserj>
but if you do you'll have access to bash.
<garyserj>
of course, if you want to use their commands from cmd.exe then make sure c:\cygwin\bin and wherever it installs its commands, is in your path.
<garyserj>
apeiros: So a class is an object, and an instance of a class is an object?
<apeiros>
but classes are the only type of objects which can create instances. modules can have instances by proxy (via including them into a class, and instantiating that class)
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<garyserj>
So can is there some objectid that I can see within the Array class name?
<garyserj>
constants and variables, have a value, right?
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<garyserj>
and if that value is a reference to an object, then I want to see that reference.
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<garyserj>
also.. so ok, a class is an object. and the name of a class is a constant. Is it true that the name of a class, is not an object? And is it true that a constant is not an object?
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<dminuoso>
garyserj: Names of classes are not constants
<dminuoso>
garyserj: It's rather that a constant can hold an object (reference)
<dminuoso>
class Foo; end; is roughtly equivalent to: Foo = Class.new
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<dminuoso>
Which means you can place a class object into anything.
<dminuoso>
>> a = Class.new; p a
<ruby[bot]>
dminuoso: # => #<Class:0x41741c24> ...check link for more (https://eval.in/959844)
<weaksauce>
garyserj when you create a class with class Foo it's just running code to create an object that is the class template. you can attach methods to that class object with def or self.something. you can also call arbitrary code inside class(which is how rails works a lot of the magic.)
<dminuoso>
garyserj: and constants are indeed not objects
<dminuoso>
garyserj: As for the last question: Ruby maintains a constant table in each class/module object
<dminuoso>
they are basically like instance variables
<dminuoso>
but a bit more exposed
<dminuoso>
weaksauce: you cant attack methods to objects.
<dminuoso>
*attach
<weaksauce>
sure you can. singleton methods
<dminuoso>
weaksauce: they are still regular methods.
<dminuoso>
weaksauce: it's just that the class they are defined on is a different one.
<dminuoso>
def a.foo; ... end can basically be rewitten as: a.singleton_class.send(:define_method, :foo) { ... }
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<dminuoso>
weaksauce: Likewise `class <<` opens a singelton class for anything, and sets it as the default definee
<dminuoso>
which is why
<dminuoso>
class << a; def foo; end; end
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<dminuoso>
and
<dminuoso>
def a.foo; end;
<dminuoso>
are the same thing
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<garyserj>
dminuoso: well if a class name isn't a constant then there's no mystery there 'cos ruby is the same as c# in that regard
<garyserj>
so that's good
<dminuoso>
garyserj: its just that the class builder syntax `class Foo; ...; end` only functions with constants (and it adds slightly different semantics than what I wrote).
<garyserj>
apeiros did write "<apeiros> e.g. `Array` is a constant referencing the core Array class."
<dminuoso>
garyserj: Yup. It lies inside Object.
<dminuoso>
So Array is actually short for Object::Array
<dminuoso>
(Since if you remember, constants reside in modules/classes. all of them)
<dminuoso>
constants cant exist anywhere else.
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<garyserj>
So is 'Array' a constant, or a Class?
<duleja_>
hello
<dminuoso>
It's foremost a constant.
<garyserj>
So are you saying it's both?
<dminuoso>
garyserj: Whether it actually is a class depends on whether someone was naughty and redefined it.
<garyserj>
assuming they didn't redefine it then
<dminuoso>
00:12 garyserj | apeiros did write "<apeiros> e.g. `Array` is a constant referencing the core Array class."
<dminuoso>
^-
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<garyserj>
so it IS a constant
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<dminuoso>
Array is a constant that references the core Array class.
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<dminuoso>
But neither do classes have to be referred to constants, nor do all constants reference classes.
<guest_>
hi
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<dminuoso>
But neither do classes have to be referred to by constants, nor do all constants reference classes.
<dminuoso>
Hi guest_.
<garyserj>
If I say class Abc {......} Then is Abc a constant?
<guest_>
hi dminuoso can i ask simple question about ruby here? I tried to post 2 minutes ago as different name though
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<dminuoso>
guest_: Sure.
<guest_>
i would like to know how can i use only strings when initializing objects ini ruby. So lets say i create a custom class and i want to pass only strings in the initialize method so if a fixnum is passed i do not want this object to be created
<dminuoso>
garyserj: Yes.
<garyserj>
dminuoso: and is Abc a class name?
<guest_>
I am not sure how can i define what types initialize method will receive?
<dminuoso>
garyserj: Abc becomes a constant inside Object that happens to refer to a newly created class object.
<dminuoso>
guest_: And also Ruby baptizes the object, so that it happens to have the name :Abc
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<dminuoso>
* garyserj
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<garyserj>
dminuoso: OK but is Abc a class name if I do class Abc {}?
<dminuoso>
garyserj: Ruby has no concept of class names.
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<garyserj>
So is it wrong to say Abc is the name of a class?
<dminuoso>
garyserj: Depends on your perspective really.
<garyserj>
if i've done class Abc { }
<dminuoso>
garyserj: I dont like it because its technically irrelevant.
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<garyserj>
well, you said Names of classes are not constants.
<dminuoso>
garyserj: Abs is a constant that refers to a class that identifies itself as :Abs
<guest_>
thank you for the answer dminuoso but i am not sure that I am following you
<dminuoso>
guest_: Dont mind me, misttabbed
<guest_>
oh ok
<dminuoso>
guest_: usually dont you dont inspect types in ruby because.. well reasons.
<guest_>
yes i know
<guest_>
that is why i am here :)
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<dminuoso>
00:17 guest_ | I am not sure how can i define what types initialize method will receive?
<dminuoso>
Welcome to singly typed languages.
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<dminuoso>
There are some tricks you can do
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<guest_>
i wanted to see if there is a way to do this? So to just limit constructor to use strings?
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<guest_>
I would know how to do this in Java though...
<dminuoso>
guest_: Like I said, Ruby is singly typed.
<guest_>
yeah...
<dminuoso>
Testing for string explicitly is kind of a lie since strictly speaking anyone can violate it by monkey patching String, or they can fit it by satisfying your interface.
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<guest_>
i follow you
<guest_>
i just want to see if i can limit initialize to use certain types
<guest_>
but it seems that in ruby you can't do this
<dminuoso>
guest_: You can but its considered non idiomatic. Ruby folks are not big fans of types and decide to rigorously test type correctness in tests by testing every code path in their programs.
<guest_>
you can check before initialize method i guess but I wanted to know if i can just do this check in the initialize method itself
<dminuoso>
Or they forego tests and have brittle software.
<eam>
guest_: you can do any check you like and raise ArgumentError
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<guest_>
i just wish to check if lets say i do this User.new("something") that if "something" is not a string, do not create an object
<guest_>
can i do this check in initialize method in User class?
<dminuoso>
guest_: well you can simply raise an exception
<guest_>
but object will be created? no?
<dminuoso>
guest_: Yeah. you cant directly block the object creation though.
<dminuoso>
guest_: yes because by the time initialize is called the object has already been constructed on the heap
<eam>
you can raise before the object is returned to the caller
<dminuoso>
though mmm
<guest_>
hmmmmm
<eam>
I suspect this is what he's really after
<dminuoso>
oh yeah that should kill the object
<dminuoso>
eam: what he's really after is a sound type system
<dminuoso>
:P
<eam>
well :D
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<guest_>
sound type system?
<dminuoso>
sorry
<dminuoso>
*a type system
<eam>
class Audio
<dminuoso>
;)
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<guest_>
i am not sure how i can forbid object from creating if type is not string
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<dminuoso>
guest_: just throw in the initialize method
<guest_>
can you give some example of initialize method in this case?
<dminuoso>
and by throw I mean raise.
<dminuoso>
but I guess in the end they are the same thing.
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<dminuoso>
class ILoveEam; def to_str; raise "funny error"; end; end
<eam>
or raise ArgumentError.new("arg must be stringy")
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<dminuoso>
curiously no matter how much you restrict me - if need be Ill unpack fiddle to bypass all your checks!
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<dminuoso>
eam: tell me
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<guest_>
eam
<eam>
hey, input validation is a good idea limits notwithstanding
<dminuoso>
does baweaver do puns in reallife too all day long?
<guest_>
you rock sir
<eam>
dminuoso: oh god yes
<dminuoso>
eam: haha!
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<eam>
guest_: a distinction here is using duck typing (has :to_str) vs class inheritance since it's more ruby-ish. You're concerned if the object knows how to become a String more than if the object is actually a String
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<guest_>
why i just never thought to raise and exception?
<guest_>
so simple...
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<guest_>
I wish you guys all best! thanks for this
<guest_>
feeling shamed not to think something as easy as this by myself though... hah i must go to sleep
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* eam
glances at the clock, can't sleep yet ...
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<dminuoso>
eam: Although one doesnt have to exclude the other.
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<dminuoso>
If you test for .is_a? Enumerable, then thats a much stronger condition than testing for .responds_to? :each
<dminuoso>
Because responding to .each but not being Enumerable has a high chance of being unlawful
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<dminuoso>
Or doing somenthing really funky
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<eam>
true - but that's a bit different since Enumerable is a mixin and likely to be used for iterators. Most objects which know how to become String aren't inherited from String
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<eam>
a time and a place for every approach I suppose
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<eam>
I suppose to_s vs to_str complicates things, I'm mostly thinking of allowing to_s in that case
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