:order => "diary_comments.id"
validates_presence_of :title, :body
+ validates_length_of :title, :within => 1..255
+ validates_length_of :language, :within => 2..3, :allow_nil => true
validates_numericality_of :latitude, :allow_nil => true
validates_numericality_of :longitude, :allow_nil => true
validates_associated :user