instance method `instance_method_already_implemented?`

Ruby on Rails 3.0.20

Since v2.2.3

Available in: v2.2.3 v2.3.18 v3.0.20 v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

instance_method_already_implemented?(method_name)

Checks whether the method is defined in the model or any of its subclasses that also derive from Active Record. Raises DangerousAttributeError if the method is defined by Active Record though.

Parameters

method_name req

Source

# File activerecord/lib/active_record/attribute_methods.rb, line 19
      def instance_method_already_implemented?(method_name)
        method_name = method_name.to_s
        @_defined_class_methods         ||= ancestors.first(ancestors.index(ActiveRecord::Base)).sum([]) { |m| m.public_instance_methods(false) | m.private_instance_methods(false) | m.protected_instance_methods(false) }.map {|m| m.to_s }.to_set
        @@_defined_activerecord_methods ||= defined_activerecord_methods
        raise DangerousAttributeError, "#{method_name} is defined by ActiveRecord" if @@_defined_activerecord_methods.include?(method_name)
        @_defined_class_methods.include?(method_name)
      end

Defined in activerecord/lib/active_record/attribute_methods.rb line 19 · View on GitHub · Improve this page · Find usages on GitHub

Defined in ActiveRecord::AttributeMethods::ClassMethods

Signature

Parameters