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
How would I do this? Thanks. Steve