Forum: Ruby on Rails has_many :through

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5dd60445347fc3dec62474cc732fef0d?d=identicon&s=25 Kyle Mathews (Guest)
on 2006-01-19 16:08
(Received via mailing list)
Has anyone had much experience using the new has_many :though options
that are currently in Edge Rails? I'm looking at using it in my
project but haven't found much about it.

2ccb2f7699267d258faaafce4ee997df?d=identicon&s=25 Cody Fauser (Guest)
on 2006-01-19 17:51
(Received via mailing list)

The :through option is the new support for join models.  This allows you
to do:

class Person < ActiveRecord::Base
  has_many :memberships
  has_many :organizations, :through => :memberships

class Membership < ActiveRecord::Base
  belongs_to :person
  belongs_to :organization

class Organization < ActiveRecord::Base
  has_many :memberships
  has_many :members, :class_name => 'Person', :through => :memberships

now you can do:
p = Person.find(:first)

or the opposite:
o = Organization.find(:first)

Also check out Rick Olson's tip:


On 1/19/06, Kyle Mathews <> wrote:
5dd60445347fc3dec62474cc732fef0d?d=identicon&s=25 Kyle Mathews (Guest)
on 2006-01-19 21:28
(Received via mailing list)
Thanks for the great response, that's just what I was looking for.

- Kyle
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