junction table question

Mickey Cowden
Tue, 09 Aug 2011 18:25:40 -0000

I''m looking into how to implement a relationship between some models,
and I think I need to use a junction table.  From the documentation
I''ve
read, a junction table doesn''t require a model.  But from my
controller,
I''m not sure how to get the data I need.  Here''s a description
of my
models and what I need in my controller:

Models
1. Event
2. Site
3. Participant

Relationships:
1. An event can have multiple sites (example video conferencing)
2. A site can have multiple events
3. Participant goes to an event at a location

Database Tables:
1. event_sites (:id, :event_id, :site_id)
2. participants (:id, :event_site_id, ...)

And in my participant controller, I need to get the sites available for
a particular event the participant is signing up for (new action).  Any
thoughts on how I can get that data from the junction table, or a better
approach in general?  Thanks.

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