+ validates :body, :presence => true
+ validates :diary_entry, :user, :associated => true
+
+ after_save :spam_check
+
+ def body
+ RichText.new(self[:body_format], self[:body])
+ end
+
+ def digest
+ md5 = Digest::MD5.new
+ md5 << diary_entry_id.to_s
+ md5 << user_id.to_s
+ md5 << created_at.xmlschema
+ md5 << body
+ md5.hexdigest
+ end
+
+ private
+
+ def spam_check
+ user.spam_check
+ end