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 1 end end
Something.methods has 'another' listed but
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
To know whether the module has a module method, you can use respond_to? on the module:
Something.respond_to?(another) => 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 end end 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
anotheris a symbol. Otherwise wouldn't
anothercause 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_evalpointing to the metaclass?
instance_evalevaluation does not happen on the metaclass, it happens on the instance - the only exception being the behaviour of
instance_evalwhich 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.