CODEWITHSUNDEEP
rubyclassobject
J.Doe
J.Doe

Reputation: 3

Scope of module's methods and extension of inner classes

I ran this script:

module Ma
  class CLogic; end

  def execute
    "Module Ma executes."
  end
end

include Ma
CLogic.execute # => "Module Ma executes."

It executes Ma#execute. I expected something like Undefined method 'execute' for class A.. I want to understand why. Is class CLogic extended by the module because of the include?

Upvotes: 0

Views: 38

Answers (2)

Stefan
Stefan

Reputation: 114138

Including a module at top-level makes its instance methods available to all objects, not just CLogic:

include Ma
123.execute    #=> "Module Ma executes."
:foo.execute   #=> "Module Ma executes."
Array.execute  #=> "Module Ma executes."
CLogic.execute #=> "Module Ma executes."

It's basically like:

class Object
  include Ma
end

Upvotes: 3

sawa
sawa

Reputation: 168081

You defined Ma#execute, which was included in the main environment. That brings the definition into Object. Since CLogic is an instance of Object, CLogic.execute would be callable.

Upvotes: 2

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