delete

# File activerecord/lib/active_record/associations/has_one_association.rb, line 26
      def delete(method = options[:dependent])
        if load_target
          case method
          when :delete
            target.delete
          when :destroy
            target.destroyed_by_association = reflection
            target.destroy
            throw(:abort) unless target.destroyed?
          when :nullify
            target.update_columns(nullified_owner_attributes) if target.persisted?
          end
        end
      end