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collection_accessor_methods(reflection, association_proxy_class) private

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# File activerecord/lib/active_record/associations.rb, line 890
        def collection_accessor_methods(reflection, association_proxy_class)
          collection_reader_method(reflection, association_proxy_class)

          define_method("#{reflection.name}=") do |new_value|
            association = instance_variable_get("@#{reflection.name}")
            unless association.respond_to?(:loaded?)
              association = association_proxy_class.new(self, reflection)
              instance_variable_set("@#{reflection.name}", association)
            end
            association.replace(new_value)
            association
          end

          define_method("#{reflection.name.to_s.singularize}_ids=") do |new_value|
            send("#{reflection.name}=", reflection.class_name.constantize.find(new_value))
          end
        end
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