[Rails] Re: mattr_accessor inside a class

[7stud --]

John Merlino wrote in post #1075232:
> Rails extends Ruby with mattr_accessor (Module accessor). As Ruby's
> attr_accessor generates getter/setter methods for instances,
> mattr_accessor provide getter/setter methods at the module level. In
> below example, you see that mattr_accessor declared in the class
> context of LookupContext. It's declared in class, not module.

A class is a module.


> However,
> modules are defined in LookupContext, for example, the module
> ViewPaths, which makes use of the accessor. So is it safe to say that
> if a module accessor is declared in class, then it can only be
> available to modules of that class?
>

What is 'it'?

class LookupContext
  def LookupContext.fallbacks
    @@fallbacks
  end

  def LookupContext.fallbacks=(arr)
    @@fallbacks = arr
  end

  module ViewPaths
    def ViewPaths.greet
      p LookupContext.fallbacks
    end
  end
end

class Dog
  def bark
    p LookupContext.fallbacks
  end
end

LookupContext.fallbacks = [10, 20, 30]
p LookupContext.fallbacks

LookupContext::ViewPaths.greet
Dog.new.bark



In this code:

module ViewPaths
      self.class.fallbacks.each do |resolver|

...self is the module LookupContext::ViewPaths, and self.class is 
Module, and Module has no method 'fallbacks':

lass LookupContext
  def LookupContext.fallbacks
    @@fallbacks
  end

  def LookupContext.fallbacks=(arr)
    @@fallbacks = arr
  end

  module ViewPaths
    puts self
    puts
    puts self.class
    puts
    puts self.class.fallbacks
  end
end

--output:--
LookupContext::ViewPaths

Module

1.rb:60:in `<module:ViewPaths>': undefined method `fallbacks' for 
Module:Class (NoMethodError)
  from 1.rb:57:in `<class:LookupContext>'
  from 1.rb:48:in `<main>'

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