Robby on Rails: Request for Rails Debugging Tools

Request for Rails Debugging Tools

Robby Russell — Mon, 09 Jan 2006 20:30:00 -0600

Howdy partners!

I hereby have a proposition for you all. Besides using breakpoint for debugging your Rails applications what other tools do you use? When I say debugging... I mean… tracking down problems and issues in your application that your tests just aren’t identifying.

Inquiring minds want to know. :-)

Debugging RoundUp!

Post comments with information and links… and I’ll roundup responses and see if I can review a few options in another blog entry.

Thanks in advance!

YeeHaw!

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"Request for Rails Debugging Tools" by Marc Tremblay

Fri, 13 Jan 2006 06:42:23 -0600

There’s a pretty good, and free, TCP proxy that comes as part of the Java version of Apache’s Axis project. I’ve used it for years and it works quite well.

"Request for Rails Debugging Tools" by RyanA

Thu, 12 Jan 2006 16:08:52 -0600

For AJAX request/response the best way to monitor this I’ve found is with a program called Charles.

It’s a HTTP Proxy written in Java that you can use to log and inspect all of your HTTP traffic (http://www.xk72.com/charles).

I discovered it back in my Macromedia Flash days… shudder

It’s good debugging! It’s not free though, $50 USD :(

Worth the money though if you spend 2 hours tracking down a problem that you could have worked out in a few minutes!

"Request for Rails Debugging Tools" by Robby Russell

Tue, 10 Jan 2006 09:05:28 -0600

Thanks guys! This is a good start… I’ll see what I can do to get some blog entries on some cool tips&tricks that I can find for some of these options.

"Request for Rails Debugging Tools" by Marc Tremblay

Tue, 10 Jan 2006 07:10:42 -0600

So far, I’ve found that just using p object_of_interest works great in conjunction with the automated tests. No need to grep anything as it’s not burried in a log.

If you don’t have a test to demonstrate a bug, then there is no bug. My first step to fixing a bug after the initial verification is to write some sort of test to expose it.

"Request for Rails Debugging Tools" by Steven A Bristol

Tue, 10 Jan 2006 05:19:50 -0600

I use Arachno Ruby for development and debugging. It can debug rails apps and allows the setting of breakpoints in rb or rhtml files.

http://www.ruby-ide.com

"Request for Rails Debugging Tools" by Jean

Mon, 09 Jan 2006 23:16:19 -0600

RDT (ruby plugin for eclipse) offers a debugger service based on debug.rb.

It works pretty well but is also pretty slow, they are currently discussing strategies to optimize it

"Request for Rails Debugging Tools" by Jeremy Voorhis

Mon, 09 Jan 2006 22:44:37 -0600

First, write good unit tests for your models and libraries. Once you feel confident in those tests, you may write functional tests. Write as many of these as you feel motivated to, even for trivial things. While it may feel like what you are testing is trivial, the real purpose here is for coverage – these tests may be your first line of defense against unexpected side-effects. In some cases, it makes sense to separate your tests for GET and POST.

When you fix a bug, be sure to write a test first. This should help you prevent it from cropping up again.

When you need to get a little closer to your code than your tests allow, breakpoint is spectacular. Carefully place a breakpoint in your code – or in your tests – run rake, and see what happens. If you are feeling intrepid, you may place one in an ERb template as well.

tail -f log/development.log is invaluable, especially when SQL may be at fault.

Peat is really smart. Take his logger and grep advice.

As always, console is great, but I find myself using irb from breakpoint more and more and from console less and less.

"Request for Rails Debugging Tools" by brasten

Mon, 09 Jan 2006 22:40:44 -0600

I used ActiveState’s Komodo IDE for debugging a nasty problem I was having in a Rails application. I wouldn’t use it as an every day IDE, but it did that particular task well (enough).

"Request for Rails Debugging Tools" by Tom Lockney

Mon, 09 Jan 2006 21:47:18 -0600

Three words: simplify, simplify, simplify.

Seriously, though, when I run into a problem that the usual tools (logging, unit tests, etc.) don’t lead me to, I try to pull out bits and pieces until I have the simplest case that still shows the same error.

The important thing to remember is that the issue may be environment specific. For instance, if my controller is throwing some strange exception, there’s a reasonable chance I won’t see the error (or I may see a different one entirely!) if I try running the code in script/console.

"Request for Rails Debugging Tools" by Julias Shaw

Mon, 09 Jan 2006 21:04:02 -0600

ummm, more tests :)

Sometimes TestUnit, sometimes JSUnit, sometimes, Selenium, and once in a while Watir, but always more automated tests.

Otherwise the problem may pop up again and I could miss it.

"Request for Rails Debugging Tools" by jr

Mon, 09 Jan 2006 20:59:09 -0600

ummm, more tests :)

"Request for Rails Debugging Tools" by rick

Mon, 09 Jan 2006 20:57:15 -0600

Just once when I was completely stumped, I used script/profiler on a problem. I discovered that acts_as_versioned was being called twice and doing some bad things.

script/profiler ‘Foo.new’

That shows you all the methods being called to instantiate that object, leaving out all the rails initialization stuff.

"Request for Rails Debugging Tools" by Peat

Mon, 09 Jan 2006 20:38:11 -0600

raise ... pretty darned handy, especially if used like:

raise my_foo.inspect

logger.debug ... although it’s good to do something like:

logger.debug '### blah blah'

... so that I can:

tail -f log/development.log | grep '###'

And, of course, there’s always the marvelous:

./script/console

... for when I need something a little more interactive.