/**
  * Copy all messages from source to this object
  * @param Issues $issues
  */
 public function import(Issues $issues)
 {
     foreach ($issues->types() as $type) {
         $source = $issues->messages($type);
         $destination = $this->messages($type);
         foreach ($source as $message) {
             $destination->add($message);
         }
     }
 }