datamapper-relationship-union-bug.rb

class Message
  include DataMapper::Resource

  property :id, Serial

  belongs_to :user
  belongs_to :recipient, 'User', :child_key => [:recipient_id]
end

class User
  include DataMapper::Resource

  property :id, Serial

  has n, :sent_messages,     'Message', :child_key => [:user_id]
  has n, :received_messages, 'Message', :child_key => [:recipient_id]

  def messages
    sent_messages + received_messages
  end
end

user1 = User.create
user2 = User.create

Message.create(:user => user1, :recipient => user2)
Message.create(:user => user2, :recipient => user1)

user1.sent_messages #=> correct
user1.received_messages #=> correct

user1.messages #=> wrong... the user_id and the recipient_id get set to the *same* value on all records??