halting

# File activesupport/lib/active_support/callbacks.rb, line 162
        def self.halting(callback_sequence, user_callback, halted_lambda, filter)
          callback_sequence.before do |env|
            target = env.target
            value  = env.value
            halted = env.halted

            unless halted
              result_lambda = -> { user_callback.call target, value }
              env.halted = halted_lambda.call(target, result_lambda)

              if env.halted
                target.send :halted_callback_hook, filter
              end
            end

            env
          end
        end