2009/10/13 steveb56 <[email protected]>: > > I have a table that is modeling a friendship between two players. I'd > like it so that there can only be one record for this friendship in > the table. I have added an index to the table to make sure that a > record is unique like so ... > > id1 id2 > 1 2 > 1 2 # Error, record isn't unique > > add_index(:friendships, [:friend_id1, :friend_id2], :unique => true) > > I would also like to add an index to take care of the following > situation... > > id1 id2 > 1 2 > 2 1 # Error, since it's the same as the first record
Could you setup your code so that for a friendship record id1 is always less than id2? If there is no way in the code that id1=2 and id2=1 can occur then you do not need to protect against it. Colin --~--~---------~--~----~------------~-------~--~----~ 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 [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
