Rails, select by nested items

Question

class Client < ActiveRecord::Base
 attr_accessible :name
 has_many :comments, :dependent => :destroy
end

class Comment < ActiveRecord::Base
 attr_accessible :title, :date
 belongs_to :client
end

How find all clients by comment date '2012-01-30'?

Answer 1

assuming date is a date type field

Client.joins(:comments).where(comments: { date: Date.new(2012,1,30) })