ActiveRecord, Find by value of nested attribute

Question

I have a Phone model nested in the Message model. How to find all messages by a given number, given that the number attribute is inside the Phone model, and not in Message ?

This is what I got now

 class Message < ActiveRecord::Base attr_accessible :phone_id belong_to :phone end class Phone < ActiveRecord::Base attr_accessible :phone has_many :messages end 

Answer 1

 Message.joins(:phone).where("phones.phone = ?","123-456-7890").all 

Answer 2

 Message.joins(:phone).where(phones: { phone: '555-555-5555' })