Yeah that's true, thanks. Steve
On Tue, Oct 13, 2009 at 9:17 AM, Marnen Laibow-Koser < [email protected]> wrote: > > 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 -~----------~----~----~----~------~----~------~--~---
