类名的哪一部分是模块？

Question

In a rails project I have the class:

class Police::Office 
end

Now I create an Interactor in the same namespace:

class Police::Office::ConstructInteractor 
end 

Is it a class in a module like:

module Police::Office
  class ConstructInteractor 
  end
end 

Or a class in a class?

class Police::Office
  class ConstructInteractor 
  end
end

Answer 1

Of course it is allowed. Classes are allowed to contain constants. (BTW: it would have taken you only a couple of seconds to try it out yourself.)

I have no idea what that means, but again, you can easily test it out yourself by just copy&pasting the code you posted and run it.

Is it a class in a module like:

 module Police::Office class ConstructInteractor end end 

Of course not. You defined Police::Office to be a class earlier, so it obviously is a class.

Or a class in a class?

 class Police::Office class ConstructInteractor end end 

Yes. But note that this is not a "class in a class". This is a constant in a class. In Ruby, classes don't nest like they do in Beta, gBeta, Newspeak, or Scala (not even like in Java). There is no relationship whatsoever between the class referenced by the constant Police::Office::ConstructInteractor and the class referenced by the constant Police::Office .