Update get_or_create method and its tests

ormar/queryset/queryset.py

@@ -998,10 +998,8 @@ class QuerySet(Generic[T]):
         try:
             return await self.get(*args, **kwargs), False
         except NoMatch:
-            if _defaults is None:
-                return await self.create(**kwargs), True
-            else:
-                return await self.create(**kwargs, **_defaults), True
+            _defaults = _defaults or {}
+            return await self.create(**{**kwargs, **_defaults}), True
 
     async def update_or_create(self, **kwargs: Any) -> "T":
         """

ormar/relations/querysetproxy.py

@@ -507,10 +507,8 @@ class QuerysetProxy(Generic[T]):
         try:
             return await self.get(*args, **kwargs), False
         except NoMatch:
-            if _defaults is None:
-                return await self.create(**kwargs), True
-            else:
-                return await self.create(**kwargs, **_defaults), True
+            _defaults = _defaults or {}
+            return await self.create(**{**kwargs, **_defaults}), True
 
     async def update_or_create(self, **kwargs: Any) -> "T":
         """

tests/test_queries/test_queryset_level_methods.py

@@ -210,6 +210,20 @@ async def test_get_or_create_with_defaults():
         assert book2.genre == "Historic"
         assert await Book.objects.count() == 1
 
+        book, created = await Book.objects.get_or_create(
+            title="doesn't exist", 
+            _defaults={"title": "overwritten", "author": "Mojix", "genre": "Historic"},
+        )
+        assert created is True
+        assert book.title == "overwritten"
+
+        book2, created = await Book.objects.get_or_create(
+            title="overwritten", _defaults={"title": "doesn't work"}
+        )
+        assert created is False
+        assert book2.title == "overwritten"
+        assert book2 == book
+
 
 @pytest.mark.asyncio
 async def test_update_or_create():