Ben Vishny wrote:> Hi all!
>
> In my application I''m trying to create a model (Groups), which
will
> allow me to save groups of objects from various tables under a common
> name. For example, one record in this table could refer to a group of
> users. Another could refer to a group of photos. How should I do this?
> When I use has_many_through I have to specify the group_id as well as
> the id for whatever object I am referring to. But if the other id could
> refer to a photo, or a user, or another model, how do I setup this kind
> of inheritance? Do I have multiple foreign key fields in the table that
> links the two together? EX: group_id, user_id, photo_id etc. and leave
> the fields not being used blank. Or does this cause an error because
> they are indexes?
>
> Best,
> Ben
1. You should name the model like Group, not Groups
2. You should look for :polymorphic => true, somewhere like this:
http://railscasts.com/episodes/154-polymorphic-association
http://guides.rubyonrails.org/association_basics.html#polymorphic-associations
or just type in Google "polymorphic association Rails", like this
http://www.google.com.ua/search?hl=uk&client=firefox-a&rls=org.mozilla:en-US:official&hs=8kT&ei=z9lFSsb0MMG1sgby4MEM&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=polymorphic+association+Rails&spell=1
--
Posted via http://www.ruby-forum.com/.