Question

Alright so I have a simple has_many :through relationship in Rails 3.1

class Event < ActiveRecord::Base
  has_many :invites

  [...]
end

class Account < ActiveRecord::Base
  has_many :invites
  has_many :events, :through => :invites

  [...]
end

class Invite < ActiveRecord::Base
  belongs_to :account
  belongs_to :event

  [...]
end

To get all of user’s events I do

@events = current_account.events

How can I get the record that joined the two tables (ie. the invite row) without running a query for each event? Or at least one column from the Invite record I need to reference?

Using :include => :invites includes ALL invites for each event. I just need the one the join was done on. I scoured Google and couldn’t find anything. I feel like this should be a pretty straightforward thing to do. What am I missing?

Answer 1

Just fetch them from the other side:

Event
  .includes ( :invites => :account )
  .where    ( :invites => {:accounts => {:id => current_account.id }} )

Be careful, in the where clause the symbols must be plural (table names) whereas in the includes clause the symbols refer to associations (plural if has_many, singular if belongs_to). BTW, your Invites model should be singular (Invite) according to rails conventions.