How do I step out of a loop with Ruby Pry?

Question

I'm using Pry with my Rails application. I set binding.pry inside a loop in my model to try and debug a problem. For example:

(1..100).each do |i|
  binding.pry
  puts i
end

When I type quit, it goes to the next iteration and stops again. Is there a way to step out of the loop so I don't have to type quit 100 times?

Currently the only way I know how to get out of it is to use CTRL+C and restart the application.

score 482 · Accepted Answer · edited May 22 '19 at 14:05

482

To exit Pry unconditionally, type

exit-program

Edit from @Nick's comment: Also works:

!!!

edited May 22 '19 at 14:05

Qortex

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answered Jun 27 '12 at 13:42

Evandro

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Though you'll obviously hit the binding straight away, using just `exit` will allow the program to keep running. – AJP Aug 17 '12 at 07:32
1

This did not work for me when running `rspec`. But CTRL-C, twice, did. – Eric Walker Jul 25 '13 at 17:48
7

on Mac OSX, pressing `Ctrl + C` twice will kill the Pry session, but will also effectively kill that terminal window: subsequent output is glitched such that I need to close that terminal tab and move to a new one. However `!!!` does not have this aggravating effect. – Topher Hunt Apr 01 '15 at 23:08
@Evandro You have no idea how this saved me! – Sri Harsha Kappala Apr 20 '16 at 06:30
Warning: If used inside an rspec test it can cause the test to falsely go green. Use the answer by @stebooks instead: `disable-pry` – Adamantish Jul 20 '16 at 18:08
In case somebody struck with * icon shown on pry command with Mac terminal , do single ctrl + C to start using Pry again – vikramvi Mar 22 '17 at 11:55

score 124 · Answer 2 · answered Feb 12 '14 at 17:39

124

I use:

disable-pry

This will keep the program running, but will keep it from continuing to stop execution. This is especially helpful when you are debugging in the console.

answered Feb 12 '14 at 17:39

stebooks

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15

To re-enable (from the command line): ENV['DISABLE_PRY'] = nil – stebooks Jun 13 '14 at 13:33
2

i was not able to reenter pry after using disable-pry. Even after using ENV['DISABLE_PRY'] = nil – daslicious Oct 31 '14 at 18:06
2

To reenter pry, all you need to do is to set `ENV['DISABLE_PRY'] = nil` in your controller not in command line OR rails console. – Radix Jun 09 '15 at 05:56
This is the perfect one to use when you're using guard and just want it to stop running pry for that test run. It'll reset on the next test run. – BBonifield Aug 26 '15 at 19:33

score 41 · Answer 3 · edited Sep 11 '15 at 16:22

41

To exit everything, use:

exit!

This should ignore all proceeding bindings.

edited Sep 11 '15 at 16:22

the Tin Man

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answered Aug 14 '13 at 19:21

Blake

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This also kills the server at the same time. `exit-program` is still probably the best option if you don't want to restart the server. – Ryan Aug 14 '13 at 21:09
3

Just to clarify `exit-program` allows you to maintain your `rails server` session but seems to throw a `SystemExit` – Alan David Garcia Jan 14 '14 at 01:28

score 25 · Answer 4 · edited Sep 11 '15 at 16:20

25

Triple exclamation (!!!) would do that.

edited Sep 11 '15 at 16:20

the Tin Man

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answered Nov 17 '14 at 23:01

Hahn

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This was the solution for me on OSX 10.11.4 (El Capitan), I did not try the `disable-pry` + `ENV['DISABLE_PRY'] = nil` combo but I did try `exit-program` which gave me a systemExit. This one just works. (On **rails** 3.2.22.2, **pry** 0.10.3 and **ruby** 1.9.3) – SidOfc Apr 28 '16 at 08:58

score 19 · Answer 5 · edited Sep 11 '15 at 16:22

19

Use

disable-pry

To renable, add this to your controller

ENV['DISABLE_PRY'] = nil

edited Sep 11 '15 at 16:22

the Tin Man

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answered Jul 24 '14 at 23:12

Chet3x16

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score 14 · Answer 6 · edited Sep 11 '15 at 16:23

14

A binding.pry statement is exactly the same as a breakpoint in GDB. Such a breakpoint in GDB would be hit 100 times too.

If you only want the binding.pry to be hit once, for the first iteration of the loop, then use a conditional on the binding.pry like so:

(1..100).each do |i|
  binding.pry if i == 1
  puts i
end

You then exit the current session by just typing exit.

edited Sep 11 '15 at 16:23

the Tin Man

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answered Nov 04 '11 at 21:52

horseyguy

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score 2 · Answer 7 · answered Jun 15 '18 at 07:57

Based on the two previous answers above:

Thank you guys! Your advices have helped me really a lot!

I just want to share a simple stupid trick, that I personally use to don't worry about the DISABLE_PRY environment variable all the time. Add this callback to the base controller ApplicationController of your project permanently. It would automatically re-enable PRY every time the disable-pry is called:

# app/controllers/application_controller.rb
class ApplicationController < ActionController::Base
  before_action :reenable_pry

  private

  def reenable_pry
    ENV['DISABLE_PRY'] = nil
  end
end

score 2 · Answer 8 · answered Oct 07 '18 at 13:58

Using gem pry-moves you can step out of loop using f (finish command)

example:

    42: def test
    43:   3.times do |i|
 => 44:     binding.pry
    45:     puts i
    46:   end
    47:   puts :finish
    48: end

[1] pry(main)> f
0
1
2

Frame: 0/1 method
From: playground/sand.rb:47 main

    42: def test
    43:   3.times do |i|
    44:     binding.pry
    45:     puts i
    46:   end
 => 47:   puts :finish
    48: end

Heartless Vayne · Answer 9 · 2019-05-29T07:15:35.130

2

press 'q' and you will see just like this

[1] pry(#<AlbumsController>)>

type

exit

this one word will do, if not:

control + c

edited May 29 '19 at 07:15

answered May 29 '19 at 07:01

Heartless Vayne

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score 0 · Answer 10 · answered May 18 '21 at 13:28

0

If you just need to debug one iteration, you can just raise error, escape guarantee :

(1..100).each do |i|
  binding.pry
  raise
  puts i
end

Or with condition :

(1..100).each do |i|
  if i == 50
    binding.pry 
    raise
  end
  puts i
end

answered May 18 '21 at 13:28

Maxime Boué

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How do I step out of a loop with Ruby Pry?

10 Answers10

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