has_many :through question

This isn't has_many :through, it's just a simple has_many association.

class User   has_many :sent_messages, :class_name => 'Message', :foreign_key => 'sender_id'   has_many :received_messages, :class_name => 'Message', :foreign_key => 'receiver_id' end

class Message   belongs_to :sender, :class_name => 'User'   belongs_to :receiver, :class_name => 'User' end