method

configure_dependency_for_has_many

v2.3.8 - Show latest stable - 0 notes - Class: ActiveRecord::Associations::ClassMethods

1.0.0
1.1.6 (0)
1.2.6 (0)
2.0.3 (6)
2.1.0 (0)
2.2.1 (15)
2.3.8 (0)
3.0.0 (18)
3.0.9 (-1)
3.1.0
3.2.1
3.2.8
3.2.13
4.0.2
4.1.8
4.2.1
4.2.7
4.2.9
5.0.0.1
5.1.7
5.2.3
6.0.0
6.1.3.1
6.1.7.7
7.0.0
7.1.3.2
7.1.3.4
What's this?

configure_dependency_for_has_many(reflection, extra_conditions = nil) private

Creates before_destroy callback methods that nullify, delete or destroy has_many associated objects, according to the defined :dependent rule.

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

The extra_conditions parameter, which is not used within the main Active Record codebase, is meant to allow plugins to define extra finder conditions.

Show source

# File activerecord/lib/active_record/associations.rb, line 1417
        def configure_dependency_for_has_many(reflection, extra_conditions = nil)
          if reflection.options.include?(:dependent)
            case reflection.options[:dependent]
              when :destroy
                method_name = "has_many_dependent_destroy_for_#{reflection.name}".to_sym
                define_method(method_name) do
                  send(reflection.name).each do |o|
                    # No point in executing the counter update since we're going to destroy the parent anyway
                    counter_method = ('belongs_to_counter_cache_before_destroy_for_' + self.class.name.downcase).to_sym
                    if(o.respond_to? counter_method) then
                      class << o
                        self
                      end.send(:define_method, counter_method, Proc.new {})
                    end
                    o.destroy
                  end
                end
                before_destroy method_name
              when :delete_all
                before_destroy do |record|
                  record.class.send(:delete_all_has_many_dependencies,
                  record,
                  reflection.name,
                  reflection.klass,
                  reflection.dependent_conditions(record, record.class, extra_conditions))
                end
              when :nullify
                before_destroy do |record|
                  record.class.send(:nullify_has_many_dependencies,
                  record,
                  reflection.name,
                  reflection.klass,
                  reflection.primary_key_name,
                  reflection.dependent_conditions(record, record.class, extra_conditions))
                end
              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

Related methods