如何抑制Rails控制台/ irb输出

Question

我遇到了一个非常奇怪的问题.

我在Rails控制台的生产服务器中测试了一些数据库条目,其中几乎所有的命令都产生了大量的o/p行,因此ssh通道被挂起了:(

有没有办法抑制控制台/ irb屏幕？

谢谢

Answer 1

你可以追加; 没有你的所有命令/声明.

例:

users = User.all; nil

实际上,irb打印最后执行的语句的(返回)值.因此,在这种情况下,它将只打印nil,因为nil是最后执行的有效语句:)

Answer 2

为了寻找如何使irb/console输出静音的解决方案,我也在austinruby.com找到了答案:

沉默irb:

conf.return_format = ""

默认输出:

conf.return_format = "=> %s\n"

限制为例如512个字符:

conf.return_format = "=> limited output\n %.512s\n"

Answer 3

Here, add this to your ~/.irbrc:

require 'ctx'
require 'awesome_print'

module IRB
  class Irb    
    ctx :ap do
      def output_value()
        ap(@context.last_value)
      end
    end
    ctx :puts do
      def output_value()
        puts(@context.last_value)
      end
    end
    ctx :p do
      def output_value()
        p(@context.last_value)
      end
    end
    ctx :quiet do
      def output_value()
      end
    end
  end
end

def irb_mode(mode)
  ctx(mode) { irb }
end

(Note: You must install the ctx gem first, though awesome_print is optional, of course.)

Now when you are on any console that uses irb, you can do the following:

Normal mode:

irb(main):001:0> { this:'is a complex object', that:[ { will:'probably'}, { be:'good to read' } ], in:{ some:{ formatted:'way'} } }

=> {:this=>"is a complex object", :that=>[{:will=>"probably"}, {:be=>"good to read"}], :in=>{:some=>{:formatted=>"way"}}}

...yep, just what you expect.

awesome_print mode:

irb(main):002:0> irb_mode(:ap)
irb#1(main):001:0> { this:'is a complex object', that:[ { will:'probably'}, { be:'good to read' } ], in:{ some:{ formatted:'way'} } }

=> {
    :this => "is a complex object",
    :that => [
        [0] {
            :will => "probably"
        },
        [1] {
            :be => "good to read"
        }
    ],
      :in => {
        :some => {
            :formatted => "way"
        }
    }
}

...wow, now everything is printing out awesomely! :)

Quiet mode:

irb#1(main):002:0> irb_mode(:quiet)
irb#1(main):001:0> { this:'is a complex object', that:[ { will:'probably'}, { be:'good to read' } ], in:{ some:{ formatted:'way'} } }
irb#1(main):002:0>

... whoah, no output at all? Nice.

无论如何,您可以添加您喜欢的任何模式,当您完成该模式时,只需exit输出或它,您将回到之前的模式.

希望有用!:)

Answer 4

irb --simple-prompt --noecho

• --simple-prompt- 使用简单的提示 - 只需>>
• --noecho- 抑制运算结果

Answer 5

在 irb 中运行以下命令对我有用：

irb_context.echo = false

Answer 6

一般来说,抑制输出

另外,根据您的需要,一般来看看使用quietly或silence_stream抑制输出,而不仅仅是在irb/console中:

silence_stream(STDOUT) do
  users = User.all
end

注意:quietly将在Ruby 2.2.0中弃用,最终将被删除. (谢谢BenMorganIO!)

更多信息可以在这里找到.