/** * Specify $elemMatch criteria for the current field. * * You can create a new expression using the {@link Builder::expr()} method. * * @see Expr::elemMatch() * @see http://docs.mongodb.org/manual/reference/operator/elemMatch/ * @param array|Expr $expression * @return self */ public function elemMatch($expression) { $this->expr->elemMatch($expression); return $this; }