Forum: Ruby on Rails Validating the uniqueness of the combination of two fields

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macarthy (Guest)
on 2007-02-20 21:21
(Received via mailing list)
Is there a built-in method to validate that two fields in combination
are unique?

e.g. if my table is :

------------------------------
username  | password
------------------------------
user1        | pass1


the following happens

MyObject.new(username=>"user1",password=>"pass2")  => ok
MyObject.new(username=>"user2",password=>"pass1")  => ok
MyObject.new(username=>"user1",password=>"pass1")  => not ok


Thanks
Kim (Guest)
on 2007-02-21 02:56
(Received via mailing list)
I am interested in this too.  Does anybody have any ideas?
bandito (Guest)
on 2007-02-21 03:14
(Received via mailing list)
validates_uniqueness_of :username, :scope => :password

http://api.rubyonrails.org/classes/ActiveRecord/Va...

(this is an extra query. You could write a unique index and rescue the
exception).
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