delete

# File activerecord/lib/active_record/associations/has_one_association.rb, line 53
      def delete(method = options[:dependent])
        if load_target
          case method
            when :delete
              target.delete
            when :destroy
              target.destroy
            when :nullify
              target.update_columns(reflection.foreign_key => nil)
          end
        end
      end