An amount refunded should be numeric, I was receiving pHP notices that a non numeric value was encountered. Seems this is something potentially new as of PHP 7.1? Is there any reason we should **not** return a float here? Any null or empty response from the SQL query would be 0, which would still be accurate for the total that was refunded for that order.
```2018/01/27 16:50:50 [error] 46797#0: *2930 FastCGI sent in stderr: "PHP message: PHP Warning: A non-numeric value encountered in /wp-content/plugins/woocommerce/includes/admin/meta-boxes/views/html-order-items.php on line 212
PHP message: PHP Stack trace:
PHP message: PHP 1. include() /cms/wp-admin/post.php:174
PHP message: PHP 2. do_meta_boxes() /cms/wp-admin/edit-form-advanced.php:714
PHP message: PHP 3. WC_Meta_Box_Order_Items::output() /cms/wp-admin/includes/template.php:1063
PHP message: PHP 4. include() /wp-content/plugins/woocommerce/includes/admin/meta-boxes/class-wc-meta-box-order-items.php:41```
This commit fixes a bug in WC_Customer_Download_Data_Store::get_downloads() that made impossible to change the order in which the query returned the results. This method accepts the arguments `order_by` and `order` but it was ignoring them and always using the default values ('permission_id' and 'ASC' respectively).
One of the assertions of the WC_Customer_Download_Data_Store::get_downloads() test method was modified to make sure the code now works.
This bug was introduced by commit a443419.
This commit improves WC_Customer_Download_Data_Store::get_downloads() performance by changing the way the SQL query is built. Before this change, this method would get all table fields even when just the permission_id field is returned. Now the method will get from the database only the fields that will be returned. The fields retrieved from the database can be controlled using the parameter `$args['return']`:
- 'objects' (default): all fields are retrieved from the database and an array of WC_Customer_Download objects is returned.
- 'ids': gets and return only permision_ids
- comma separated list of fields (new option added by this commit): gets and return only the required fields. Examples: 'user_email,download_id,order_id' or 'order_id,download_count'.
Mike Jolley
Rodrigo Primo
Claudio Sanches
Patrick Garman
Peter Westwood
Claudiu Lodromanean
Fulvio Notarstefano
Arif Widianto