Friday, April 22, 2016
Hey!
I think it'd be helpful if you provide us with a little bit of context. What are you trying to achieve?
Basically, you have two lines of defense: the app and the database. Like Colin said, if uniqueness is an essential constraint in your domain then you should enforce it at the database level. You can also use Active Record uniquness validator to display a nice error message (but this w/o the database-level constraint is not enough). If there's a race condition Active Record will raise RecordNotUnique.
If you tell us a bit more we might be able to give you more specific advice.
Best regards
-- Greg Navis
I help small tech companies to scale Heroku-hosted Rails apps.
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