method

configure_dependency_for_has_many

v2.0.3 - Show latest stable - 0 notes - Class: ActiveRecord::Associations::ClassMethods

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What's this?

configure_dependency_for_has_many(reflection) private

See HasManyAssociation#delete_records. Dependent associations delete children, otherwise foreign key is set to NULL.

# File activerecord/lib/active_record/associations.rb, line 1173
        def configure_dependency_for_has_many(reflection)
          if reflection.options.include?(:dependent)
            # Add polymorphic type if the :as option is present
            dependent_conditions = []
            dependent_conditions << "#{reflection.primary_key_name} = \#{record.quoted_id}"
            dependent_conditions << "#{reflection.options[:as]}_type = '#{base_class.name}'" if reflection.options[:as]
            dependent_conditions << sanitize_sql(reflection.options[:conditions]) if reflection.options[:conditions]
            dependent_conditions = dependent_conditions.collect {|where| "(#{where})" }.join(" AND ")

            case reflection.options[:dependent]
              when :destroy
                module_eval "before_destroy '#{reflection.name}.each { |o| o.destroy }'"
              when :delete_all
                module_eval "before_destroy { |record| #{reflection.class_name}.delete_all(%(#{dependent_conditions})) }"
              when :nullify
                module_eval "before_destroy { |record| #{reflection.class_name}.update_all(%(#{reflection.primary_key_name} = NULL),  %(#{dependent_conditions})) }"
              else
                raise ArgumentError, "The :dependent option expects either :destroy, :delete_all, or :nullify (#{reflection.options[:dependent].inspect})"
            end
          end
        end

configure_dependency_for_has_many

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