orjson test and doc

docs/models/inheritance.md

@@ -570,4 +570,38 @@ class Category(CreateDateFieldsModel, AuditCreateModel):
     code: int = ormar.Integer()
 ```
 
-That way you can inherit from both create and update classes if needed, and only one of them otherwise.
+That way you can inherit from both create and update classes if needed, and only one of them otherwise.
+
+## __queryset_cls__
+
+You can define your own queryset_class(extends the `Queryset`) in your model class, default is `QuerySet`
+
+```python
+import ormar
+from ormar.queryset.queryset import QuerySet
+from fastapi import HTTPException
+
+
+class MyQuerySetClass(QuerySet):
+    
+    async def first_or_404(self, *args, **kwargs):
+        entity = await self.get_or_none(*args, **kwargs) 
+        if entity is None:
+            # in fastapi or starlette
+            raise HTTPException(404)
+
+class Book(ormar.Model):
+    class Meta:
+        metadata = metadata
+        database = database
+        tablename = "book"
+    
+        __queryset_cls__ = MyQuerySetClass
+    
+    id: int = ormar.Integer(primary_key=True)
+    name: str = ormar.String(max_length=32)
+
+    # when book not found, raise `404` in your view.
+    book = await Book.objects.first_or_404(name="123")
+
+```

tests/test_queries/test_utils.py

@@ -1,3 +1,4 @@
+import orjson
 import json
 
 from ormar.queryset.utils import to_str
@@ -5,6 +6,9 @@ from ormar.queryset.utils import to_str
 
 def test_to_str():
     expected_str = "[]"
+    val = orjson.dumps([])
+    assert expected_str == to_str(val)
+
     val = json.dumps([])
     assert expected_str == to_str(val)