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collection_reader_method(reflection, association_proxy_class) private

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# File activerecord/lib/active_record/associations.rb, line 1053
        def collection_reader_method(reflection, association_proxy_class)
          define_method(reflection.name) do |*params|
            ivar = "@#{reflection.name}"

            force_reload = params.first unless params.empty?
            association = instance_variable_get(ivar) if instance_variable_defined?(ivar)

            unless association.respond_to?(:loaded?)
              association = association_proxy_class.new(self, reflection)
              instance_variable_set(ivar, association)
            end

            association.reload if force_reload

            association
          end

          define_method("#{reflection.name.to_s.singularize}_ids") do
            send(reflection.name).map(&:id)
          end
        end
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