Crazy polymorphic multiple has_many association

Message.rb

class Message < ActiveRecord::Base

  belongs_to :recipient, :polymorphic => true
  belongs_to :sender, :polymorphic => true

end

User.rb

class User < ActiveRecord::Base
  
  has_many :messages_as_received, -> { where("recipient_type = 'User'") },
                        :foreign_key => "recipient_id", :class_name => "Message"
  has_many :received_messages, :through => :messages_as_received, :source => :recipient, :source_type => "User"

  has_many :messages_as_sent, -> { where("sender_typ = 'User'") },
                        :foreign_key => "sender_id", :class_name => "Message"
  has_many :sent_messages, :through => :messages_as_sent, :source => :sender, :source_type => "User"
  
end

Since User can send and receive messages using

 has_many :messages, :as => :recipient
 has_many :messages, :as => :sender

Doesn't work on the model. So I had to alias the j has_many.

This all looks like what I was expecting. Good job.