Fixed queries without serializers again.

It was working only with `.first()`.

Support `.values()`.
Support empty results.

Author: iurisilvio

django_qserializer/serialization.py

@@ -106,8 +106,13 @@ def to_serialize(self, serializer=None):
 
     def _fetch_all(self):
         super()._fetch_all()
-        if self._serializer:
-            self._serializer._prepare_objects(self._result_cache)
+        if not self._result_cache:
+            return
+
+        serializer = self.serializer
+
+        if serializer and isinstance(self._result_cache[0], models.Model):
+            serializer._prepare_objects(self._result_cache)
 
     def _clone(self):
         c = super()._clone()

django_qserializer/tests/test_serializer.py

@@ -148,7 +148,7 @@ class S(BaseSerializer):
 
         def prepare_objects(self, objs):
             for obj in objs:
-                assert obj._prefetched_objects_cache
+                assert obj._prefetched_objects_cache['travels']
 
         def serialize_object(self, obj):
             return {
@@ -164,3 +164,19 @@ def test_query_without_serializer(bus_fixture):
     Regression test. Query without serializer failed.
     """
     Bus.objects.first()
+    list(Bus.objects.all())
+
+
+def test_values(bus_fixture):
+    """
+    Regression test.
+    """
+    qs = Bus.objects \
+        .to_serialize(BaseSerializer) \
+        .values('plate')
+    plate = list(qs)[0]
+    assert {'plate': 'BUSER'} == plate
+
+
+def test_empty_result(db):
+    Bus.objects.to_serialize(BaseSerializer).first()

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = django_qserializer
-version = 0.2.6
+version = 0.2.7
 url = https://github.com/buserbrasil/django-qserializer
 license = MIT
 author = Iuri de Silvio