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class Message < ActiveRecord::Base
default_scope order(:created_at)
belongs_to :discussion, :counter_cache => true, :touch => true
belongs_to :user
validates :user, :discussion, :body, :presence => true
after_save :mark_discussion_as_read
def visible_for? user
self.created_at.to_i >= self.discussion.user_invited_at(user).to_i
end
private
def mark_discussion_as_read
self.discussion.mark_as_read_for(self.user)
end
end
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