Hello! I'm trying to figure out how to make two columns unique regardless of order. If order mattered, I could scope the validates_uniqueness_of, like this: http://stackoverflow.com/questions/1633297/how-do-i-validate-two-fields-for-uniqueness
But that's only one way. What if I have two columns, called "sender" and "receiver" and it doesn't really matter who is the sender and who is the receiver as long as that "grouping" doesn't exist previously. For example, assume I have this already in the database: Sender = 1, Receiver = 2 Then, the following should occur: Sender = 1, Receiver = 3 # => PASS Sender = 1, Receiver = 2 # => FAIL Sender = 2, Receiver = 1 # => FAIL Sender = 3, Receiver = 1 # => FAIL (if the first one that passed already happened) I tried this: validates_uniqueness_of :sender_id, :scope => :receiver_id validates_uniqueness_of :receiver_id, :scope => :sender_id But that doesn't quite do it because they aren't tied together. I can custom-validate this but I was wondering if this pattern has already been accounted for somehow. Any pointers/references? Thanks! -Danimal -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com. To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
