fix: order manager caching (#821)

* Fix order cache

The existing cache key does not take into account all parameters, leading to caching errors when e.g. loading page two (you will get a hit on the cache for the first page that was viewed and therefore cached).

This change automatically uses the entire args array to create the key, ensuring uniqueness.

* Update Manager.php

* Update Manager.php

includes/Order/Manager.php

@@ -30,9 +30,12 @@ public function all( $args = [] ) {
 
         $args = wp_parse_args( $args, $default );
 
-        $offset       = ( $args['paged'] - 1 ) * $args['limit'];
+        $offset      = ( $args['paged'] - 1 ) * $args['limit'];
         $cache_group = 'dokan_seller_data_'.$args['seller_id'];
-        $cache_key   = 'dokan-seller-orders-' . $args['status'] . '-' . $args['seller_id'];
+
+        // Use all arguments to create a hash used as cache key
+        $cache_key   = 'dokan_seller_orders-' . md5(json_encode($args));
+
         $orders      = wp_cache_get( $cache_key, $cache_group );
 
         $join        = $args['customer_id'] ? "LEFT JOIN $wpdb->postmeta pm ON p.ID = pm.post_id" : '';