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Return Array of Overridden Methods in Ruby Subclasses

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  1. # thanks to the answer here:
  2. # http://stackoverflow.com/questions/3488203/how-do-i-see-where-in-the-class-hierarchy-a-method-was-defined-and-overridden-in
  3. class Object
  4.   def self.overridden_methods(parent_class = Object, within_tree = true)
  5.     if within_tree
  6.       defined_methods = ancestors[0..ancestors.index(parent_class) - 1].map { |object| object.instance_methods(false) }.flatten.uniq
  7.       parent_methods = superclass.instance_methods
  8.     else
  9.       defined_methods = instance_methods(false)
  10.       parent_methods = parent_class.instance_methods
  11.     end
  12.     defined_methods & parent_methods
  13.   end
  14.  
  15.   def overridden_methods(parent_class = Object, within_tree = true)
  16.     self.class.overridden_methods(parent_class, within_tree)
  17.   end
  18.  
  19.   def self.overrides?(method, parent_class = Object, within_tree = true)
  20.     overridden_methods(parent_class, within_tree).include?(method.to_s)
  21.   end
  22.  
  23.   def overrides?(method, parent_class = Object, within_tree = true)
  24.     self.class.overrides?(method, parent_class, within_tree)
  25.   end
  26. end
  27.  
  28. class ParentModel < Object
  29.   def save; end
  30. end
  31.  
  32. class ChildModel < ParentModel
  33.   def save; end
  34.   def create; end
  35.   def to_s; end
  36. end
  37.  
  38. class AnotherChildModel < ParentModel
  39.   def save; end
  40. end
  41.  
  42. class GrandChildModel < ChildModel
  43.   def create; end
  44. end
  45.  
  46. # what have you overridden from the base `Object` class
  47. p ParentModel.overridden_methods(Object)
  48. #=> []
  49. p ParentModel.overridden_methods(Object, false)
  50. #=> []
  51. p ChildModel.overridden_methods(Object)
  52. #=> ["to_s", "save"]
  53. p ChildModel.overridden_methods(Object, false)
  54. #=> ["to_s"]
  55. p ChildModel.overridden_methods(ParentModel)
  56. #=> ["to_s", "save"]
  57. p ChildModel.overridden_methods(ParentModel, false)
  58. #=> ["to_s", "save"]
  59. p AnotherChildModel.overridden_methods(Object)
  60. #=> ["save"]
  61. p AnotherChildModel.overridden_methods(Object, false)
  62. #=> []
  63. p AnotherChildModel.overridden_methods(ParentModel)
  64. #=> ["save"]
  65. p AnotherChildModel.overridden_methods(ParentModel, false)
  66. #=> ["save"]
  67. p GrandChildModel.overridden_methods(Object)
  68. #=> ["create", "to_s", "save"]
  69. p GrandChildModel.overridden_methods(Object, false)
  70. #=> []
  71. p GrandChildModel.overridden_methods(ParentModel)
  72. #=> ["create", "to_s", "save"]
  73. p GrandChildModel.overridden_methods(ParentModel, false)
  74. #=> []
  75. p GrandChildModel.overridden_methods(ChildModel)
  76. #=> ["create"]
  77. p GrandChildModel.overridden_methods(ChildModel, false)
  78. #=> ["create"]
  79.  
  80. # note, this probably won't work with modules overriding methods, it just needs to be tweaked a little more

URL: return-array-of-overridden-methods-in-ruby-subclasses

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