diff --git a/.coverage b/.coverage
index f3e5faf..ed0ddb4 100644
Binary files a/.coverage and b/.coverage differ
diff --git a/ormar/fields/foreign_key.py b/ormar/fields/foreign_key.py
index 679830a..2448fde 100644
--- a/ormar/fields/foreign_key.py
+++ b/ormar/fields/foreign_key.py
@@ -87,6 +87,8 @@ class ForeignKeyField(BaseField):
 
     @classmethod
     def _construct_model_from_dict(cls, value: dict, child: "Model") -> "Model":
+        if len(value.keys()) == 1 and list(value.keys())[0] == cls.to.Meta.pkname:
+            value["__pk_only__"] = True
         model = cls.to(**value)
         cls.register_relation(model, child)
         return model
diff --git a/tests/test_foreign_keys.py b/tests/test_foreign_keys.py
index f1bd7fa..6463eb6 100644
--- a/tests/test_foreign_keys.py
+++ b/tests/test_foreign_keys.py
@@ -133,6 +133,8 @@ async def test_model_crud():
         assert album1.pk == 1
         assert album1.tracks is None
 
+        await Track.objects.create(album={"id": track.album.pk}, title="The Bird2", position=4)
+
 
 @pytest.mark.asyncio
 async def test_select_related():
diff --git a/tests/test_more_reallife_fastapi.py b/tests/test_more_reallife_fastapi.py
index 02233e6..31e31b9 100644
--- a/tests/test_more_reallife_fastapi.py
+++ b/tests/test_more_reallife_fastapi.py
@@ -61,13 +61,13 @@ def create_test_database():
 @app.get("/items/", response_model=List[Item])
 async def get_items():
     items = await Item.objects.select_related("category").all()
-    return [item.dict() for item in items]
+    return items
 
 
 @app.post("/items/", response_model=Item)
 async def create_item(item: Item):
-    item = await Item.objects.create(**item.dict())
-    return item.dict()
+    await item.save()
+    return item
 
 
 @app.post("/categories/", response_model=Category)