[email protected] wrote: > Hello > > I have the three database models: "seller", "client" and "account". A > seller may have many clients and many accounts, but I would like to > add the constraint that given a seller and a client, only one account > may exist between them. > > Is there a way to express this contraint using ActiveRecord relations?
Yes -- validates_uniqueness_of will do the trick -- but never rely solely on ActiveRecord constraints. You need a unique index (and foreign key constraints) on the DB side too. > > Thanks in advance, > Andre 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.
