Dynamically add a class to a module in Ruby

Question

Let's say I create a module dynamically like so:

app = Object.const_set('CoolModule', Module.new)

Is there anyway to add a class to that module? Something like this maybe?

app << (class Application; end)

I'm basically trying to get the following going

module 'CoolModule'.turnThisIntoAModule
  class Application < Rails::Application
    config.blabla = 2
  end
end

Answer 1

You may add a class for dynamically named module like in the following example:

app = Object.const_set('CoolModule', Module.new)

Object.const_get('CoolModule').
  const_set('Application', Class.new(Rails::Application) do
    config.blabla = 2
  end)

If you have access to app object at point of call, it may replace Object.const_get('CoolModule') expression, of course.

Module.module_eval suggests itself but it unfortunately does not do scoped lookup in its block form. It does it in the string argument form, but I'd discourage use of evals on strings.

Answer 2

You just repeat the same thing.

CoolModule.const_set("SomeVeryDynamicName", Module.new do
  class Application < Rails::Application
    config.blabla = 2
  end
end)