Override value_from_object method to ensure its value is properly coerced.

Author: rtibbles

morango/models/fields/uuids.py

@@ -32,6 +32,15 @@ def to_python(self, value):
         value = super(UUIDField, self).to_python(value)
         return value.hex if isinstance(value, uuid.UUID) else value
 
+    def get_default(self):
+        default = super(UUIDField, self).get_default()
+        if isinstance(default, uuid.UUID):
+            return default.hex
+        return default
+
+    def value_from_object(self, obj):
+        return self.to_python(super(UUIDField, self).value_from_object(obj))
+
 
 class UUIDModelMixin(models.Model):
     """