On 22 Feb 2009, at 00:20, Evan wrote:
> > I've confused myself. > > I have three objects: level, product, part. Together they classify a > repair type. > > - Replacing a part in a product has a level of difficulty associated > with it. > - The same part replaced in a different product has a different level > of difficulty. > > How can I model an association among these? > > I have created a join model, "Repair class," and connected all three > using :has_many through. However, this does not prevent multiple > records where the part and product stay the same, but the level > changes. In other words, I end up with multiple levels assigned to the > same part/product combination which does not happen in the real world. > You might want to describe exactly what join model you have created Personally my instinct would be to have a unique index on the join table enforcing that there is only one entry for each part/product pair Fred > What's the best way to proceed? > > Evan > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
