/**
  * Only return messages that are sent from/to a specific player
  *
  * @param  Player $player The player related to the messages
  * @return self
  */
 public function forPlayer($player)
 {
     $this->extras .= '
         LEFT JOIN player_conversations ON player_conversations.conversation=conversations.id
     ';
     $this->column('player_conversations.player')->is($player);
     $this->column('conversations.status')->isOneOf(Conversation::getActiveStatuses());
     return $this;
 }