Orders API: Add item and variation filters

doc/api/resources/orders.rst

@@ -128,6 +128,10 @@ last_modified                         datetime                   Last modificati
 
    The ``custom_followup_at`` attribute has been added.
 
+.. versionchanged:: 4.4
+
+   The ``item`` and ``variation`` query parameters have been added.
+
 
 .. _order-position-resource:
 
@@ -415,6 +419,8 @@ List of all orders
    :query string code: Only return orders that match the given order code
    :query string status: Only return orders in the given order status (see above)
    :query string search: Only return orders matching a given search query
+   :query integer item: Only return orders with a position that contains this item ID. *Warning:* Result will also include orders if they contain mixed items, and it will even return orders where the item is only contained in a canceled position.
+   :query integer variation: Only return orders with a position that contains this variation ID. *Warning:* Result will also include orders if they contain mixed items and variations, and it will even return orders where the variation is only contained in a canceled position.
    :query boolean testmode: Only return orders with ``testmode`` set to ``true`` or ``false``
    :query boolean require_approval: If set to ``true`` or ``false``, only categories with this value for the field
                                     ``require_approval`` will be returned.

src/pretix/api/views/order.py

@@ -92,6 +92,8 @@ with scopes_disabled():
         subevent_after = django_filters.IsoDateTimeFilter(method='subevent_after_qs')
         subevent_before = django_filters.IsoDateTimeFilter(method='subevent_before_qs')
         search = django_filters.CharFilter(method='search_qs')
+        item = django_filters.CharFilter(field_name='all_positions', lookup_expr='item_id')
+        variation = django_filters.CharFilter(field_name='all_positions', lookup_expr='variation_id')
 
         class Meta:
             model = Order