use default value when value is missing

Author: WaVEV

django_mongodb/compiler.py

@@ -1,6 +1,6 @@
 from django.core.exceptions import EmptyResultSet, FullResultSet
 from django.db import DatabaseError, IntegrityError, NotSupportedError
-from django.db.models import NOT_PROVIDED, Count, Expression
+from django.db.models import Count, Expression
 from django.db.models.aggregates import Aggregate
 from django.db.models.constants import LOOKUP_SEP
 from django.db.models.sql import compiler
@@ -73,6 +73,7 @@ def _make_result(self, entity, columns):
         """
         result = []
         for name, col in columns:
+            field = col.field
             column_alias = getattr(col, "alias", None)
             obj = (
                 # Use the related object...
@@ -81,7 +82,8 @@ def _make_result(self, entity, columns):
                 if column_alias is not None and column_alias != self.collection_name
                 else entity
             )
-            result.append(obj.get(name, NOT_PROVIDED))
+            value = obj.get(name, field.get_default())
+            result.append(value)
         return result
 
     def check_query(self):