On Apr 3, 7:14 pm, Marcelo de Moraes Serpa <[email protected]> wrote: > > The first though I had was to use STI **but** somehow make AR instantiate > the object based on a type attribute in a different model/table (in this > case in the products_suppliers table) so as to make the type vary based on > the relationship between product and supplier (as a a supplier might be a > vendor for a product and/or maybe a manufacturer). > > The thing is, I tried to monkeypatch AR to add this support to STI, but the > thing is that I ended up by loosing too much time. I think that I will just > keep a type field in products_suppliers and save a string value there (maybe > coming from an enumeration) and define a method in the supplier model to get > its type (is_vendor?, is_manufacturer)... KIS[S] :) >
It wouldn't really be STI - it's a pretty basic that a given row in the database (ie object) has one type - feels like you;d be jumping through hoops to make AR believe you're doing STI. You might actually be able to sort of make this work if you did has_many :suppliers, :through => :product_suppliers, :select => 'suppliers.*, product_suppliers.type' but you might run into odd sideeffects. Fred > But of course, any suggestions appreciated! > > Thanks, > > Marcelo. > > On Thu, Apr 2, 2009 at 3:32 PM, Frederick Cheung <[email protected] > > > wrote: > > > On Apr 2, 7:05 pm, Marcelo de Moraes Serpa <[email protected]> > > wrote: > > > > What I would like to happen is, when a supplier is retrieved using the > > > following command: > > > > @suppliers = @product.suppliers.all > > > > Somehow hook up AR and look into the type attribute of the > > > products_suppliers association and for each record, instantiate the > > correct > > > class (either Vendor or Manufacturer). > > > So for any given row in product_suppliers, there's a supplier_id. > > Surely the row in the suppliers table with that id is either a > > Manufacturor or a Vendor ? > > > Fred > > > > It's STI, only that the type data is in another realm and is "variable" > > > (depending on the product). > > > > Is there a way to do that with the current STI implementation in Rails > > > 2.2.2? If not, how could I hook up AR to make it happen? Or do you > > suggest > > > something simpler? > > > > Any suggestions appreciated. > > > > Marcelo. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
