Created
August 15, 2010 17:47
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# thanks to the answer here: | |
# http://stackoverflow.com/questions/3488203/how-do-i-see-where-in-the-class-hierarchy-a-method-was-defined-and-overridden-in | |
class Object | |
def self.overridden_methods(parent_class = Object, within_tree = true) | |
if within_tree | |
defined_methods = ancestors[0..ancestors.index(parent_class) - 1].map { |object| object.instance_methods(false) }.flatten.uniq | |
parent_methods = superclass.instance_methods | |
else | |
defined_methods = instance_methods(false) | |
parent_methods = parent_class.instance_methods | |
end | |
defined_methods & parent_methods | |
end | |
def overridden_methods(parent_class = Object, within_tree = true) | |
self.class.overridden_methods(parent_class, within_tree) | |
end | |
def self.overrides?(method, parent_class = Object, within_tree = true) | |
overridden_methods(parent_class, within_tree).include?(method.to_s) | |
end | |
def overrides?(method, parent_class = Object, within_tree = true) | |
self.class.overrides?(method, parent_class, within_tree) | |
end | |
end | |
class ParentModel < Object | |
def save; end | |
end | |
class ChildModel < ParentModel | |
def save; end | |
def create; end | |
def to_s; end | |
end | |
class AnotherChildModel < ParentModel | |
def save; end | |
end | |
class GrandChildModel < ChildModel | |
def create; end | |
end | |
# what have you overridden from the base `Object` class | |
p ParentModel.overridden_methods(Object) | |
#=> [] | |
p ParentModel.overridden_methods(Object, false) | |
#=> [] | |
p ChildModel.overridden_methods(Object) | |
#=> ["to_s", "save"] | |
p ChildModel.overridden_methods(Object, false) | |
#=> ["to_s"] | |
p ChildModel.overridden_methods(ParentModel) | |
#=> ["to_s", "save"] | |
p ChildModel.overridden_methods(ParentModel, false) | |
#=> ["to_s", "save"] | |
p AnotherChildModel.overridden_methods(Object) | |
#=> ["save"] | |
p AnotherChildModel.overridden_methods(Object, false) | |
#=> [] | |
p AnotherChildModel.overridden_methods(ParentModel) | |
#=> ["save"] | |
p AnotherChildModel.overridden_methods(ParentModel, false) | |
#=> ["save"] | |
p GrandChildModel.overridden_methods(Object) | |
#=> ["create", "to_s", "save"] | |
p GrandChildModel.overridden_methods(Object, false) | |
#=> [] | |
p GrandChildModel.overridden_methods(ParentModel) | |
#=> ["create", "to_s", "save"] | |
p GrandChildModel.overridden_methods(ParentModel, false) | |
#=> [] | |
p GrandChildModel.overridden_methods(ChildModel) | |
#=> ["create"] | |
p GrandChildModel.overridden_methods(ChildModel, false) | |
#=> ["create"] | |
# note, this probably won't work with modules overriding methods, it just needs to be tweaked a little more |
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