On 21 May 2010 15:49, [email protected] <[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?
Does Client belongs_to seller, and Account belongs_to seller? If so then you could put client and account together in one table. Alternatively have Client has_one account and Account belongs_to client, or the other way round. This doesn't work if you have HABTM relationship of course. 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.
