Why doesn't Module.method_defined?(:method) work correctly?

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I'm trying to check if a method is defined in a module using Module.method_defined?(:method) and it is returning false it should be returing true.

module Something
  def self.another

Something.methods has 'another' listed but Something.method_defined?(:another) returns false.

Is this maybe not working because the method is defined on self? If this is the case is there another way to check if the method is defined on the module other than using method_defined??

To know whether the module has a module method, you can use respond_to? on the module:

=> true

method_defined? will tell you whether INSTANCES of the class with the module included responds to the given method.

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Modules methods are defined in its metaclass. So you can also check for method inclusion with:

k = class << Something; self; end # Retrieves the metaclass
k.method_defined?(:another)  #=> true

You can read more about it in Understanding Ruby Metaclasses.

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I'm adding my version of the answer

Using the singleton_methods method:

module Something
  def self.another

Something.singleton_methods.include?(:another) #=> true, with all parent modules
Something.singleton_methods(false).include?(:another) #=> true, will check only in the Something module

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  • Perhaps I am reading this wrong, but shouldn't it be Something.respond_to?(:another) so another is a symbol. Otherwise wouldn't another cause an undefined error?
  • The diagram on that site is confusing to say the least. What does it mean by the instance 'inheriting' the methods from the class? seems like wrong terminology to me. Also what does it mean by the arrow labeled instance_eval pointing to the metaclass? instance_eval evaluation does not happen on the metaclass, it happens on the instance - the only exception being the behaviour of def in an instance_eval which instead defines methods on the metaclass.
  • Thank you! Not sure why the other answer go the checkmark. This is the way to actually do it.