Forum: Ruby on Rails has_many :through

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Kyle M. (Guest)
on 2006-01-19 17:08
(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.

Kyle
Cody F. (Guest)
on 2006-01-19 18:51
(Received via mailing list)
Kyle,

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
end

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

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

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

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

Also check out Rick O.'s tip:
http://rails.techno-weenie.net/tip/2005/12/23/teac...



Cody


On 1/19/06, Kyle M. <removed_email_address@domain.invalid> wrote:
>
--
http://www.codyfauser.com
Kyle M. (Guest)
on 2006-01-19 22:28
(Received via mailing list)
Thanks for the great response, that's just what I was looking for.

- Kyle
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