Inventory_Presser_Plugin::modify_query_for_max_price( object $query )

	public function modify_query_for_max_price( $query ) {
		// Do not mess with the query if it's not the main one and our CPT.
		if ( ! $query->is_main_query()
			|| empty( $query->query_vars['post_type'] )
			|| INVP::POST_TYPE !== $query->query_vars['post_type']
		) {
			return;
		}

		// Get original meta query.
		$meta_query = $query->get( 'meta_query' );
		if ( ! is_array( $meta_query ) ) {
			$meta_query = array();
		}

		if ( isset( $_GET['max_price'] ) ) {
			$meta_query['relation'] = 'AND';
			$meta_query             = self::maybe_add_meta_query(
				$meta_query,
				apply_filters( 'invp_prefix_meta_key', 'price' ),
				(int) $_GET['max_price'],
				'<=',
				'numeric'
			);
			$query->set( 'meta_query', $meta_query );
		}
	}