Expose constants to all sub-modules in Rails

Question

I have a Rails nested module as follow:

lib
 - Parent
   - Child1.rb
   - Child2.rb

In Child1.rb I define:

module Parent
  module Child1
  end
end

Child2 module is defined similarly.

In my model, I call:

model MyModel
   include Parent::Child1
   include Parent::Child2
end

I have a few constants to be shared between Child1 and Child2. How should I go about implementing it?

Vimsha · Answer 1 · 2013-06-07 16:55:18Z

Create a file called parent.rb in lib to define the parent module and put the constants in there

module Parent
  CONSTANT1 = "1"
  CONSTANT2 = "2"
end

both constants will now be available in your child modules

Structure will look like

lib
 - Parent
   - child1.rb
   - child2.rb
 - parent.rb

1 Answer