Colin Law wrote: > 2009/10/13 steveb56 <[email protected]>: >> 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.
And if you really want to make this bulletproof, you can enforce id1 < id2 with a check constraint in the DB. > > Colin Best, -- Marnen Laibow-Koser http://www.marnen.org [email protected] -- 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 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 -~----------~----~----~----~------~----~------~--~---
