Matt Jones wrote in post #1109607: > On Saturday, 18 May 2013 11:14:35 UTC-4, Denny Mueller wrote: >>> belongs_to :user >> 1 0001 1 >> 2 0002 1 >> 3 0001 2 >> 4 0001 3 >> 5 0002 3 >> >> >> How can i approach this? Any hints what I have to look for? >> > > validates_uniqueness_of has a 'scope' option that will do exactly what > you're describing:
Also note that any use of validates_uniqueness_of should also be backed by unique constraints in the database to prevent race conditions from causing duplicates. For more details on race conditions related to uniqueness validations read the section under "Concurrency and integrity" here: http://api.rubyonrails.org/classes/ActiveRecord/Validations/ClassMethods.html#method-i-validates_uniqueness_of -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/46b921321ce9e4d0cb821f7270560fe9%40ruby-forum.com?hl=en-US. For more options, visit https://groups.google.com/groups/opt_out.
