association_accessor_methods

# File activerecord/lib/active_record/associations.rb, line 1012
        def association_accessor_methods(reflection, association_proxy_class)
          ivar = "@#{reflection.name}"

          define_method(reflection.name) do |*params|
            force_reload = params.first unless params.empty?

            association = instance_variable_get(ivar) if instance_variable_defined?(ivar)

            if association.nil? || force_reload
              association = association_proxy_class.new(self, reflection)
              retval = association.reload
              if retval.nil? and association_proxy_class == BelongsToAssociation
                instance_variable_set(ivar, nil)
                return nil
              end
              instance_variable_set(ivar, association)
            end

            association.target.nil? ? nil : association
          end

          define_method("#{reflection.name}=") do |new_value|
            association = instance_variable_get(ivar) if instance_variable_defined?(ivar)

            if association.nil? || association.target != new_value
              association = association_proxy_class.new(self, reflection)
            end

            association.replace(new_value)

            instance_variable_set(ivar, new_value.nil? ? nil : association)
          end

          define_method("set_#{reflection.name}_target") do |target|
            return if target.nil? and association_proxy_class == BelongsToAssociation
            association = association_proxy_class.new(self, reflection)
            association.target = target
            instance_variable_set(ivar, association)
          end
        end