ensure defaults are set during deserialize

pynamodb · Sep 10, 2020 · 6a1b9e0 · 6a1b9e0
1 parent 93d4c28
commit 6a1b9e0
Showing 1 changed file with 6 additions and 3 deletions.
diff --git a/pynamodb/attributes.py b/pynamodb/attributes.py
@@ -317,10 +317,13 @@ def _deserialize(self, attribute_values: Dict[str, Dict[str, Any]]) -> None:
         """
         Sets attributes sent back from DynamoDB on this object
         """
+        self.attribute_values = {}
+        self._set_defaults(_user_instantiated=False)
         for name, attr in self.get_attributes().items():
-            attribute_value = attribute_values.get(attr.attr_name, {NULL: True})
-            value = None if NULL in attribute_value else attr.deserialize(attr.get_value(attribute_value))
-            setattr(self, name, value)
+            attribute_value = attribute_values.get(attr.attr_name)
+            if attribute_value and NULL not in attribute_value:
+                value = attr.deserialize(attr.get_value(attribute_value)
+                setattr(self, name, value)
 
     def __eq__(self, other: Any) -> bool:
         # This is required so that MapAttribute can call this method.