Dataset sets management API endpoints

closes #1720 (closed)

requires !2264 (merged)

EDIT: contrary to what it says in the issue, the endpoints require contributor access to the dataset's corpus, excepted for DELETE which requires admin access.

TODO

• Update Dataset endpoints documentation (no more sets editing there)

arkindex/project/serializer_fields.py

@@ -284,9 +284,10 @@ class DatasetSetsCountField(serializers.DictField):
     def get_attribute(self, instance):
         if not self.context.get("sets_count", True):
             return None
-        elts_count = {k.name: 0 for k in instance.sets.all()}
+        dataset_sets = instance.sets.all()
+        elts_count = {k.name: 0 for k in dataset_sets}
         elts_count.update(
-            DatasetElement.objects.filter(set_id__in=instance.sets.values_list("id"))
+            DatasetElement.objects.filter(set_id__in=[ds.id for ds in dataset_sets])
             .values("set__name")
             .annotate(count=Count("id"))
             .values_list("set__name", "count")