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<zUriel_>
when you change a class variable @@v in a child class, it seems to also change @@v in the parent and in other child classes. Is that the expected behaviour ?
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<jhass>
Yes and the reason many people avoid class variables in ruby
<centrx>
zUriel_, Yes, that is why using class variables is discouraged
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<zUriel_>
Ok. quite unexpected...
<centrx>
zUriel_, Use class instance variables
<centrx>
zUriel_, Those are not shared among the class hierarchy/inheritance tree
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<Mon_Ouie>
I still find it weird that this issue seems to be specific to Ruby
<zUriel_>
Well, I use a class that is generic (for webservices), and the class variable contains the string that is used for Json validation. So a class variable sound the best option. No instanciation was really needed
<centrx>
I think it's more of a naming thing. If @class_instance_variables were called "class variables" and @@class_variables were called "goofy variables" no one would get confused
<centrx>
zUriel_, That sounds more like a constant? Those are declared like MY_CONSTANT = 5 in the class definition
<Mon_Ouie>
But in Java and C++ both static variables behave like Ruby's class variables and they don't even have class instance variables as far as I can tell
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<zUriel_>
centrx: I used constants at first but I ran into another problem : child classes call super() for validation, and the parent class used the parent JSON validation string, not the child validation string.
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<Mon_Ouie>
Why not use a (regular, instance) method to specify which validation string to use? Or pass it as an argument to the parent's initialize method?
<centrx>
zUriel_, That sounds like you want a method defined on the child that returns a different value
<zUriel_>
Mon_Ouie: I may end up doing this, yes.
<zUriel_>
centrx: ok, I was thinking about this. I looked not natural to me to use a method to store a quite static string, but why not...
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<zUriel_>
Shouldn't it be a class method, btw ?
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<Mon_Ouie>
It could be actually, I don't think there's much of a reason to make it one though
<Mon_Ouie>
Putting it in a method just means letting the object describe how it is to be validated. If you make it a class method you ask the class how to validate its instances.
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<zUriel_>
Thanks, I'll try that. this @@v behaviour seems a bit odd, that said, I found it counter-intuitive, at least.
<zUriel_>
Thanks for your help, Mon_Ouie & centrx
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<cfkoch>
Anybody play around with mruby much?
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<|jemc|>
zUriel_: you should probably know that because classes are all instances of Class, they can hold @instance_variables of their own
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<|jemc|>
which might be a bit more like what you were envisioning
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<macsplean1>
what is the best way to learn the version of ruby that a gem version depends on?
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<|jemc|>
gem dependency the_gem_name
<macsplean1>
|jemc| that doesn't show the ruby version
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<centrx>
macsplean1, Best way is to look at the README/website/source control repository
<centrx>
macsplean1, I'm not sure many gems specify a version of Ruby in their dependencies, especially now that 1.8 is mostly gone
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<macsplean1>
centrx, thanks, i just decided to use the latest version of the gem even though the tutorial uses something different ant look at the changelog to see differences
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