On Feb 21, 11:34 pm, Frederick Cheung <[email protected]>
wrote:
> On Feb 21, 9:39 pm, Jo Jo <[email protected]> wrote:
>
> > 2 tables Items and Categories
>
> > Categories (id, name)
> > Items (id, name, category_id)
>
> > Category_id can be null, and there are Categories that has not an Item.
>
> Well you may not realise it yet, but the fact that having a
> category_id on the items table and no other columns on the categories
> table works for you means that you have already solved this problem:
> the belongs_to always lives on the table with the foreign key and the
> has_many or has_one on the other side.
>
Oops, forgot to add that
http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html
and http://guides.rails.info/association_basics.html cover this sort
of stuff.
Fred
> Fred
>
> > --
> > Posted viahttp://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
-~----------~----~----~----~------~----~------~--~---
