List PO/SO/BO by reference in API (#4083)

* API: Add filter by reference to SO, PO. Add filtering by customer to SO list

* API: Add filtering by reference to Build order list

* Add test for changes

* Increment API version

* Add test for BO reference

* Add missing description of API version

InvenTree/build/api.py

@@ -65,6 +65,13 @@ class BuildFilter(rest_filters.FilterSet):
 
         return queryset
 
+    # Exact match for reference
+    reference = rest_filters.CharFilter(
+        label='Filter by exact reference',
+        field_name='reference',
+        lookup_expr="iexact"
+    )
+
 
 class BuildList(APIDownloadMixin, ListCreateAPI):
     """API endpoint for accessing a list of Build objects.

InvenTree/build/test_api.py

@@ -63,6 +63,14 @@ class TestBuildAPI(InvenTreeAPITestCase):
         response = self.client.get(url, {'part': 99999}, format='json')
         self.assertEqual(len(response.data), 0)
 
+        # Get a certain reference
+        response = self.client.get(url, {'reference': 'BO-0001'}, format='json')
+        self.assertEqual(len(response.data), 1)
+
+        # Get a certain reference
+        response = self.client.get(url, {'reference': 'BO-9999XX'}, format='json')
+        self.assertEqual(len(response.data), 0)
+
     def test_get_build_item_list(self):
         """Test that we can retrieve list of BuildItem objects."""
         url = reverse('api-build-item-list')