On 13 September 2011 22:17, Randy Regnier <rbregn...@gmail.com> wrote: > On 09/13/2011 03:34 PM, Jesse wrote: >> >> On 9/13/11 1:22 PM, Randy Regnier wrote: >>> >>> I have a question about how best to model a pair of properties/attributes >>> in Rails3. The generic "models" are: >>> >>> class Foo < ActiveRecord::Base >>> end >>> class Bar < ActiveRecord::Base >>> end >>> >>> I want Foo to have two associations with Bar, along the lines of >>> 'has_one' for each association, where I can work with each, as in bar1 and >>> bar2. 'has_many' would work, but it would be extra work to have to fish the >>> correct one out of the array, and isn't as elegant a way to model the >>> relationships. >>> >>> Thanks >>> >>> Randy >>> >> I suppose that it could be done with a has_one relationship repeated as >> such >> class Foo < AR::B >> belongs_to :bar1, class_name => "Bar", :foreign_key => "bar1_id" >> belongs_to :bar2, class_name => "Bar", :foreign_key => "bar2_id" >> end >> >> Mind you this is not a very elegant way of doing it, but it is adhering to >> KiSS principles. >> >> On the Bar end of things, how should the relationship play out? Should it >> only be able to be associated to one Foo? >> >> Also are do bar 1 and bar 2 behave differently or have any characteristic >> that distinguish them. In other words, are all bar1's always going to be >> bar1's? if so you can do a normal has many relationship with a limit of 2 >> children and then scopes on the bar model to make up the difference. >> >> Jesse >> > > Thanks. > > On the Bar end, it would only be associated with the one Foo, yes. > > bar1 and bar2 would have different values for their respective properties, > but that is about all. Well, I guess if a Foo got removed, then so should > both of its Bars, but I think I've seen how to do that part.
Looking at a Bar can you tell whether it is a bar1 or a bar2 just from the records contents? 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 rubyonrails-talk@googlegroups.com. To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
