Comments on: Debugging techniques in Elixir /2016/04/debugging-techniques-in-elixir-lang/ Plataformatec's place to talk about Ruby, Ruby on Rails, Elixir, and software engineering Wed, 27 Apr 2016 20:04:00 +0000 hourly 1 https://wordpress.org/?v=6.4.2 By: Luke Imhoff /2016/04/debugging-techniques-in-elixir-lang/comment-page-1/#comment-1599 Wed, 27 Apr 2016 20:04:00 +0000 /?p=5280#comment-1599 How do you evaluate expressions in the evaluator window after attaching to the process? I have variable names listed like `resource@1`, but that’s not a valid Erlang variable name, so I can’t do `resource@1#{relationships}` to get the `relationships` value out of the `resource@1` map. I seem to only be able to evaluate variables by clicking on their name. Is there someway to refer to Elixir variables, so the Erlang evaluator can parse them?

]]> By: scott hamilton /2016/04/debugging-techniques-in-elixir-lang/comment-page-1/#comment-1597 Fri, 22 Apr 2016 15:15:00 +0000 /?p=5280#comment-1597 In reply to Erich Kist.

THANKS!!! I figured it was possible. Just wanted to see if there was any advice on the subject. Thanks, I’ll take a stab at it over the weekend.

]]> By: Erich Kist /2016/04/debugging-techniques-in-elixir-lang/comment-page-1/#comment-1594 Wed, 20 Apr 2016 14:17:00 +0000 /?p=5280#comment-1594 In reply to scott hamilton.

HI Scott, you can use debugger with docker.

Probably, the debugger will not run in the docker. So, my suggestion is to start a locally shell and connect with your node in docker and then use the debugger. Our next post will cover this strategy. Stay tuned for more details.

]]> By: Bryan Hunt /2016/04/debugging-techniques-in-elixir-lang/comment-page-1/#comment-1593 Wed, 20 Apr 2016 10:30:00 +0000 /?p=5280#comment-1593 I’ve written a convenience script to make patching the beam file easier (tested on OS-X)- you can grab it from here : https://gist.github.com/ef1830f3f7ce2fcdbda2cf9aa781b68f

]]> By: davidcotter /2016/04/debugging-techniques-in-elixir-lang/comment-page-1/#comment-1592 Mon, 18 Apr 2016 16:15:00 +0000 /?p=5280#comment-1592 Great article.
I got it working on Windows with the int.erl compile and the –werl. I tried debugging a Phoenix app and it worked but I don’t quit know what I am doing. To debug the Phoenix app:

c:devhello_phoenix> iex –werl -S mix phoenix.server
iex(1)> :debugger.start()
iex(2)> :int.ni(HelloPhoenix.PageController)
iex(3)> :int.break(HelloPhoenix.PageController, 5)

Refresh browser and it breaks at the controller. The “:int.ni” interprets the module for debugging purposes. Does this mean that I need to call ni and break for every module I want to step through – I guess so. Do you know if it is possible “Step over” – I can’t see any difference between “Next” and “Step” in the debugger. Am I doing it right?

I had no idea this was possible with elixir/phoenix so it’s great for tracking down elusive issues.

]]> By: scott hamilton /2016/04/debugging-techniques-in-elixir-lang/comment-page-1/#comment-1591 Mon, 18 Apr 2016 14:17:00 +0000 /?p=5280#comment-1591 I’m a big docker fan for dev. Does anybody know if you can get the debugger to work with docker?

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