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<Psy-Q>
how can i lay out my rubygems-in-development so i can develop e.g. 2 gems in parallel and load the freshest lib/foobar.rb from disk from inside a gem that provides bin/foobar?
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<Psy-Q>
or maybe those are bad example names. bin/dosomething is in one gem and requires lib/foobar.rb from another
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<yew>
dminuoso: how do you replace class variables with class instance variables?
<dminuoso>
yew: you remove one @ ?
<dminuoso>
:-)
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<dminuoso>
yew: A class instance variable is just a plain instance variable. The trick is to understand that even a class is just an object, and as such can have instance variables.
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<yew>
dminuoso: but what happens if you want a class variable which is common across all the objects of the class?
<dminuoso>
yew: You use a class instance variable...
<dminuoso>
Let me demonstrate
<yew>
dminuoso: But you said not to use it
<dminuoso>
yew: I said not to use class variables!
<dminuoso>
This may be easier shown than explained. Give me a second.
<yew>
dminuoso: What is the point of class variables existing if they shouldn't be used?
<dminuoso>
yew: It's for the case where the inheritance behavior _is_ desirable.
<dminuoso>
I cant think of any right now. :-P
<yew>
dminuoso: Is it not possible to use class instance variables to simulate class variables?
<dminuoso>
yew: You just use @foo but from within the context of the class itself.
<dminuoso>
yew: Generally the rule of thumb is: If it's mutable: use a constant and freeze it, if it's not use a class instance variable.
<dminuoso>
Oh, other way around. But you get the idea.
<yew>
dminuoso: Yeah, but constants in Ruby aren't actually /constant/
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<dminuoso>
yew: Which is why you should freeze it too. ;-)
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<yew>
dminuoso: Freezing doesn't stop you from reassigning a constant
<dminuoso>
yew: No but Ruby will help you there. In strict mode it will blow up
<yew>
dminuoso: How do I enable strict mode?
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<dminuoso>
Errr. freeze does.
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<dminuoso>
Mmm. Weird.
<dminuoso>
I hate Ruby.
<dminuoso>
Bye
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<yew>
dminuoso: Bye?
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<yew>
Is it still acceptable to use class variables but to be disciplined in using them, kinda like how in Python all members of a class are public?
<dminuoso>
yew: It should not be.
<matthewd>
yew: It is of course acceptable to use them if they're what you need... they're just probably not what you actually need/want.
<yew>
Okay, thanks.
<dminuoso>
yew: The issue is that class variables leak implementation, and generally prevents your class from maintaining invariants.
<dminuoso>
Anyone can inherit from your class and then fiddle around with it.
<matthewd>
dminuoso: That's not a very compelling argument.. this is ruby, after all.
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<dminuoso>
matthewd: You are right, I should be freezing all my classes. :-)
<matthewd>
IMO it's less about "they allow tampering" and more about "they don't work how you think they do, and that will bite you"
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<dminuoso>
matthewd: Perhaps this is just my C++ showing here. Thinking about contracts and invariants has been burned into my mind..
<yew>
matthewd: I guess that is true since this works in ruby: ruby -e 'CONST=1; CONST=2; puts CONST'
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<matthewd>
Right. Ruby really doesn't do [enforced] contracts and invariants.. at best it does hurdles.
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<yew>
dminuoso, matthewd: Okay, thanks a lot
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<profsimm>
Collection methods bug me. Why is it "remove" when I remove one item and "clear" when I remove all of them? Why is it "set" when I set one item and "replace" when I set all of them?
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<dminuoso>
profsimm: What class are you talking about?
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<profsimm>
dminuoso: Hash for ex.
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<matthewd>
Words have meanings ¯\_(ツ)_/¯
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<dminuoso>
profsimm: Ruby was designed by Japanese folks. You should the names of some of the C functions.
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<profsimm>
dminuoso: sounds fun :/
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<dminuoso>
profsimm: Indeed. You randomly then get fun comments to help you make sense of it.
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<ResidentBiscuit>
I have an rspec stub that says `expect(user).to receive(:foo)`, but the code being tested is `user.try(:foo)`. When I run rspec, I get an error `received unexpected message :try with (:foo)` The code could change how exactly it calls that method, but the tests shouldn't break because of that. Is there something I need to enable to make this work? My google-fu hasn't found this issue out there.
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<rabajaj>
i am trying to add this code to the models file, strip function is working as it should
<rabajaj>
instead i am getting the entire string value that is present in search
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<rabajaj>
?
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<rabajaj>
^^
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<apeiros>
rabajaj: what?
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<apeiros>
rabajaj: ok, 30min no follow up. I guess it's not that important
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<havenwood>
rabajaj: If mind reading is what you're looking for, change `search =` (setting a local variable) to `self.search =` (using a setter method). That's my guess.
<rabajaj>
havenwood, apeiros sorry i was afk and dint see your messages :(
* havenwood
appreciates instance variables
<rabajaj>
havenwood, could you give an example of setter method ?
<havenwood>
rabajaj: Does it work as you intend with?: self.search_attr = search.strip
<havenwood>
rabajaj: #search_attr=
<havenwood>
you're not intending to set a local variable there, right? because that's what you're doing.
<rabajaj>
there a search variable which contains the value filled in the search field, eg " name = rahul". i want to strip that value using `before_save` callback method
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<havenwood>
rabajaj: You're trying to strip the :search field before you save?
<rabajaj>
yes
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<havenwood>
Nowaker: I'm sure a patch would be much appreciated.
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<graft>
so i'm doing an http request using net::http (actually net::http::persistent), and the response object i'm getting back says it has already been read (i.e., if i call response.read_body with a block it complains that it was already read)
<graft>
but i'm not reading it - who is? is this expected behavior, that the response from http.request will have already been read?
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<graft>
or a better question: what do you need to get an unread response (so i can read it in chunks)
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<bluesocksyellowt>
@graft afaik read_body is the way to do that. do you have code to share?
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<graft>
bluesocksyellowt: i'm using read_body, however read_body raises if it has already been called before, and i'm not sure why that's happening
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<bluesocksyellowt>
reduced example would help.
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<graft>
blerm. lemme make a gist
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<hays>
or is it better to define the hash first and then populate it outside the definition
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<Papierkorb>
hays: For this, I'd prefer to write it on a single line. If that's too hard to read, it's the sign that you should filter first and assign later
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<emers2n>
I want to decrement a string like so "hello" = ["ello", "llo", "lo", "o"]. Is there a built in function to do this?
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<emers2n>
@emers2n Looks like not - just need a for loop and a splice
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