Setting Class Variables with Class Method

Hey guys,
I was wondering how to set class variables using a class method, for

class Foo
@@this_works = ‘hello’
@@this_does_not = self.goodbye

def self.goodbye
return ‘goodbye’

Is there an equivalent to initialize but for loading class variables? I
was able to get something above to work by adding a method:

def self.this_does_not=()
@@this_does_not = var

and than calling:

Foo.this_does_not = Foo.goodbye

but this would force me to use public methods and in terms of
organization, I like to define class methods at the top.

On Wed, Oct 20, 2010 at 6:04 PM, Thijs De vries [email protected]


You can’t call a method before defining it. The call to self.goodbye
is executed at that point, but the method goodbye doesn’t exist yet.
Try this:

irb(main):001:0> class Foo
irb(main):002:1> def self.goodbye
irb(main):003:2> “goodbye”
irb(main):004:2> end
irb(main):005:1> @@this_works = ‘hello’
irb(main):006:1> @@this_does_not = self.goodbye
irb(main):007:1> end
=> “goodbye”
irb(main):011:0> Foo.send(:class_variable_get, “@@this_does_not”)
=> “goodbye”

With all the caveats around being sure that you really need class
variables and not class instance variables, and so on…

Hope this helps,


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