Flvorful Bloggage comments

"Rescuing Ruby" by jake

Tue, 14 Aug 2007 13:55:54 -0500

yes, most of you are correct. find_by_id would be much cleaner. I’m sorry, i should have used better examples. I was just trying to illustrate a use of inline rescues. I dont really use it for that, but i also didnt want to dig through lines of source code to find a realy example (sorry there’s just too many lines and not enough time :) )

—jake

"Rescuing Ruby" by Johnny P

Tue, 14 Aug 2007 13:48:15 -0500

Sorry for the multi comment. I thought it had been lost and I did not submit, now I know it was due to moderator approval. Thanks

"Rescuing Ruby" by Johnny P

Tue, 14 Aug 2007 13:47:13 -0500

Inline rescue is sweet chaining with no method missing magic!

send ARGV[1] rescue MyModule.send ARGV[1] unless ARGV[1].nil?

"Rescuing Ruby" by Johnny P

Tue, 14 Aug 2007 12:23:46 -0500

I have found using an inline rescue is a nice way to avoid implementing method_missing, polymorphism, or some complex conditional logic. So, for example you have a simple ruby script with behavior rapped up in some methods where your last statement is:

send ARGV[1]

Now you want to extend this to execute some behavior in a module, class, or object instance, so:

send ARGV[1] rescue MyModule.send ARGV[1] unless ARGV[1].nil?

It is short and to the point with the right hand condition keeping all in check.

"Rescuing Ruby" by Andy

Tue, 14 Aug 2007 08:43:50 -0500

I prefer find_by_id.

"Quick Zebra Striping in Rails" by herval

Tue, 14 Aug 2007 08:26:15 -0500

a new Rails discovery every day… :-)

"Quick Zebra Striping in Rails" by Roman Mackovcak

Tue, 14 Aug 2007 07:47:58 -0500

Nice piece of code. Thanks for the tip.

"Quick Zebra Striping in Rails" by rod

Tue, 14 Aug 2007 07:25:32 -0500

Sweet as it is! thanks!

"Rescuing Ruby" by Dan Kubb

Mon, 13 Aug 2007 23:55:18 -0500

Another approach is to use find_by_id instead of find:


@person = Person.find_by_id(params[:id])

If a person with this id isn’t found, no exception will be raised, and @person will be set to nil.

"Rescuing Ruby" by OJ

Mon, 13 Aug 2007 19:05:15 -0500

Why does this feel like the Ruby equivalent of VB’s “on error resume next”? :)

Personally I can’t see how you’d want to carry on when objects aren’t found, but if I ever do I’ll keep your advice in mind.

Thanks for the post.