activerecord find through association

Question

I am trying to retrieve an activerecord object from my db. My models are

class User < ActiveRecord::Base
   belongs_to :account
   has_many :domains, :thr         


        

Answer 1

The following piece of code did the trick:

User.joins(:account).joins('INNER JOIN "domains" ON "accounts"."id" = \
"domains"."account_id"').where(:users => {"username" => "Paul"}).
where(:domains => {"name" => "paul-domain"})

Sorry about the formatting of this long line of code

Answer 2

If you're using Rails 3.x, the following code would get the query result:

User.where(:username => "Paul").includes(:domains).where("domains.name" => "paul-domain").limit(1)

To inspect what happen, you can append .to_sql to above code.

If you're using Rails 2.x, you'd better write the raw sql query.