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class Topic < ActiveRecord::Base
has_many :replies, :foreign_key => "parent_id"
serialize :content
before_create :default_written_on
before_destroy :destroy_children #'self.class.delete_all "parent_id = #{id}"'
def parent
self.class.find(parent_id)
end
protected
def default_written_on
self.written_on = Time.now unless attribute_present?("written_on")
end
def destroy_children
self.class.delete_all "parent_id = #{id}"
end
end
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