Fetch all objects to include in one query to improve performance massively

Author: Cotix

flask_restless/views/base.py

@@ -1413,7 +1413,7 @@ def get_all_inclusions(self, instance_or_instances):
         # one instance. Otherwise, collect the resources to include for
         # each instance in `instances`.
         if isinstance(instance_or_instances, Query):
-            instances = instance_or_instances
+            instances = instance_or_instances.all()
             to_include = set(chain(map(self.resources_to_include, instances)))
         else:
             instance = instance_or_instances