Rails debugging support

[deivid-rodriguez]

Ruby 2 has been out there for more than a year, and the debugger gem still doesn't provide support for it.

I think it's time we stop providing it in the default Gemfile. A lot of a debugger's users are beginners learning the language/framework. In my opinion, being "officially" recommended a software that doesn't work can be discouraging for them.

If this is agreed, there are a number of options:

• Don't recommend a default debugger at all in the Gemfile.
• Replace it with byebug, which seems to be de debugger of choice for ruby >= 2.0

In any case, specific code to support debugger (such as https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/kernel/debugger.rb or https://github.com/rails/rails/blob/master/railties/lib/rails/rack/debugger.rb) could be removed because byebug doesn't need it anymore.

Let me know if you would accept this change so I can get a Pull Request ready.

Cheers!

[rafaelfranca]

You are right, we need to change it. I think we may prefer to point to https://github.com/ko1/debugger2, but I really wish we could merge this project with the original debugger gem.

@ko1 is there something missing to merge your fork with the original debugger gem?

[rafaelfranca]

Other thing that we need to think about is how support Ruby 1.9 and Ruby 2.0 applications. We are not planning to remove support to 1.9 yet.

[deivid-rodriguez]

As far as I know, @ko1 recommends byebug for 2.0 debugging.

Regarding keeping support for Ruby 1.9, I think debugger monkeypatches should be moved to the debugger gem.

[schneems]

Can we use bundlers platform feature to include both debuggers in the default Gemfile?

[deivid-rodriguez]

I like that idea too

gem 'debugger', platform: :mri_19, group: [:development, :test]
gem 'byebug', platform: [:mri_20, :mri_21], group: [:development, :test]

[guilleiguaran]

We can detect the ruby version during the application creation and add the appropiate gem to Gemfile.

[ko1]

(2014/03/31 5:48), David Rodríguez wrote:

As far as I know, @ko1 https://github.com/ko1 recommends |byebug| for
2.0 debugging.

Yes.

// SASADA Koichi at atdot dot net

[arthurnn]

👍 for using byebug on 2.0+ . We are using it for a while already.

[rafaelfranca]

@ko1 thank you for replying.

@deivid-rodriguez please go ahead and open a PR 😄

[deivid-rodriguez]

@rafaelfranca Ok, I will. So we want to keep support for debugger gem, right? In that case I was thinking of adding some if RUBY_VERSION < '2.0.0' around. I ask because there are very few of them in rails code...

[rafaelfranca]

If we have a way to feature detect I'd prefer to do it. But if we don't it is fine to check the RUBY_VERSION

[deivid-rodriguez]

Ok, I'll work on this and get back to you. Cheers!

[rafaelfranca]

Implemented at #14646