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class Message < ActiveRecord::Base
belongs_to :user_sender, class_name: "User", foreign_key: "user_sender_id"
belongs_to :user_target, class_name: "User", foreign_key: "user_target_id"
validates_presence_of :user_sender, :user_target, :text, on: :create
def sender
@sender ||= if self.user_sender.present?
user_sender
else
User.first
end
end
def target
# can be nil
@target ||= user_target
end
end
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