Ruby Uninitialized Constant Error (Mental Note)

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Monday, April 14, 2008

The reason I always get initialized constant errors occurring in Ruby is accidentally naming models the plural form of the database table name and not letting Rails automatically create the pluralisations.

script/generate scaffold contact_skill contact_id:integer skill_id:integer description:string
not
script/generate scaffold contact_skills ...

(This reason is one I constantly forget, and Google never helps me. Now I will not forget)

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edit: I’ve had a LOAD of google hits from this search query in the last few days, if this helps you or doesn’t please leave a comment to make this article more complete.

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Posted in learning, meaningful labor, rails | 4 Comments »

  • rsmith@diablodigital.com

    Thanks for that David, saved me a few hours of heartache. Not suprised you have a lot of hits on this page, nether the books or site mention this rather important fact.

    To help others that have this problem, I discovered the command to removing unwanted scaffolding …

    “script/destroy scaffold contact_skills”

    This cleans up the project nicely.

    Best of luck with Ruby, am having long nights myself trying to get a decent site up and running with it, I think it’s worth it though having come from a .Net background and that really is painful.

  • ryanjm

    A) Thanks for the reminder, this was a huge help. The comment about script/destroy is very helpful too.

    B) If you want more comments, I would suggest changing your settings to make it easier for people to leave a post rather than creating an account. If you want to monitor that fine, that works, but WP has a pretty good system for getting rid of spam.

  • http://www.davidlowry.co.uk David

    Thanks for the comments guys. Ryan, I’ve enabled FFA comments.. see how that goes! :)

    I see I’m top of (my) google search for “Ruby Uninitialized Constant Error” … nice!

  • Andy

    Hi David,

    You just saved me a helluva long debugging time :P I could not beleive I was getting an error this early after scaffolding :P

    big up to rsmith for the command to rollback a scaffold :D

    thx guys