diff --git a/mongow/mixins/base.py b/mongow/mixins/base.py
index 20106e9..d0b8237 100644
--- a/mongow/mixins/base.py
+++ b/mongow/mixins/base.py
@@ -1,10 +1,13 @@
 from typing import (
+    Any,
     Generic,
+    Optional,
     TypeVar,
     Union
 )
 
 import pymongo
+from bson import ObjectId
 from pydantic import (
     BaseModel,
     Field
@@ -14,13 +17,11 @@
 from ..utils import (
     Direction,
     Indice,
-    ObjectId,
     PyObjectId
 )
 
 T = TypeVar("T", bound="BaseMixin")
 
-
 class BaseMixin(
     BaseModel,
     Generic[T]
@@ -37,7 +38,7 @@ class Config:
             ObjectId: str
         }
 
-    def __new__(cls):
+    def __new__(cls, *_, **__):
         self_dict = __class__.Config.__dict__
         subclass_dict = cls.Config.__dict__
         for key in self_dict:
@@ -73,14 +74,10 @@ async def create_indices(cls):
     def build_indice(cls, data: Union[Indice, tuple]) -> Indice:
         if isinstance(data, tuple):
             data = Indice(
-                keys=[(data[0], data[1])],
-                name=data[2] if len(data) > 2 else None,
-                unique=data[3] if len(data) > 3 else None,
-                background=data[4] if len(data) > 4 else None,
-                sparse=data[5] if len(data) > 5 else None,
-                bucket_size=data[6] if len(data) > 6 else None,
-                min=data[7] if len(data) > 7 else None,
-                max=data[8] if len(data) > 8 else None
+                keys=[(
+                    data[0], 
+                    data[1] if len(data) > 1 else Direction.ASCENDING
+                )]
             )
 
         if not isinstance(data, Indice):
@@ -116,3 +113,14 @@ def build_pymongo_index(indice: Indice) -> pymongo.IndexModel:
             kwargs["name"] = "_".join([key[0] for key in indice.keys]) + "_index"
 
         return pymongo.IndexModel(**kwargs)
+
+    @classmethod
+    def instantiate_obj(cls, key: str, value: Union[str, Any]) -> tuple[str, Any]:
+        if isinstance(value, str):
+            if key == "_id":
+                return key, ObjectId(value)
+            # TODO: get attr name by alias name
+            # assume it is an _id and pop off its underscore
+            # cls.schema(by_alias=True).get("properties").keys()
+            # return key, typing.get_type_hints(cls)[search_key](value)
+        return key, value
\ No newline at end of file
diff --git a/mongow/mixins/model.py b/mongow/mixins/model.py
index 748e9cf..ec7ff39 100644
--- a/mongow/mixins/model.py
+++ b/mongow/mixins/model.py
@@ -5,7 +5,8 @@
     List,
     Optional,
     Tuple,
-    Union
+    Type,
+    Union,
 )
 
 from bson import ObjectId
@@ -19,19 +20,10 @@
 
 class ModelMixin(BaseMixin):
 
-    @classmethod
-    def instantiate_obj(cls, key: str, value: Union[str, Any]) -> tuple[str, Any]:
-        if isinstance(value, str):
-            if key == "_id":
-                return key, ObjectId(value)
-            # TODO: get attr name by alias name
-            # assume it is an _id and pop off its underscore
-            # cls.schema(by_alias=True).get("properties").keys()
-            # return key, typing.get_type_hints(cls)[search_key](value)
-        return key, value
-
     @classmethod
     async def create(cls, data: T) -> ObjectId:
+        if not data.id:
+           data.id = ObjectId() 
         result = await database.database[cls.__collection__].insert_one(
             data.dict(by_alias=True)
         )
@@ -39,19 +31,19 @@ async def create(cls, data: T) -> ObjectId:
 
     @classmethod
     async def read(
-            cls,
-            fields: Iterable[str] = tuple(),
-            order: Optional[Tuple[str, bool]] = None,
-            offset: int = 0,
-            limit: int = 100,
-            filters: Optional[Union[T, dict]] = None,
-            construct_object: bool = False
+        cls: Type[T],
+        fields: Iterable[str] = tuple(),
+        order: Optional[Tuple[str, bool]] = None,
+        offset: int = 0,
+        limit: int = 100,
+        filters: Optional[Union[T, dict]] = None,
+        construct_object: bool = False
     ) -> List[T]:
         if filters is None:
             filters = {}
         elif isinstance(filters, cls):
             filters = filters.dict(exclude_unset=True, by_alias=True)
-        else:
+        elif isinstance(filters, dict):
             filters = dict(starmap(cls.instantiate_obj, filters.items()))
 
         cursor = database.database[cls.__collection__].find(
@@ -78,10 +70,10 @@ async def aggregate(cls, pipeline, construct_object: bool = False) -> Any:
 
     @classmethod
     async def update(
-            cls,
-            data: T,
-            filters: Union[T, dict],
-            operator: str = "$set"
+        cls,
+        data: T,
+        filters: Union[T, dict],
+        operator: str = "$set"
     ) -> int:
         if not isinstance(filters, dict):
             filters = filters.dict(
@@ -119,8 +111,7 @@ async def upsert(cls, data: T, filters: Union[T, dict]) -> int:
         result = await database.database[cls.__collection__].update_one(
             filters,
             {"$set": dict_data},
-            upsert=True,
-            return_document=True
+            upsert=True
         )
         return result.modified_count
 
diff --git a/tests/func/test_aliasing.py b/tests/func/test_aliasing.py
index 2d00c34..f482d10 100644
--- a/tests/func/test_aliasing.py
+++ b/tests/func/test_aliasing.py
@@ -1,4 +1,5 @@
 from bson import ObjectId
+from pymongo import errors
 import pytest
 
 from tests.schemas import Fruit
@@ -8,7 +9,8 @@
 async def oid():
     f = Fruit(name="Banana", taste="sweet")
     oid = await Fruit.create(f)
-    return oid
+    yield oid
+    await Fruit.delete(filters={})
 
 
 class TestRetrieveAndInstantiate:
@@ -23,11 +25,13 @@ async def test_alias_str(self, oid: ObjectId):
 
     async def test_name_oid(self, oid: ObjectId):
         filters = dict(id=oid)
-        await self.check_response(filters)
+        with pytest.raises(AssertionError):
+            await self.check_response(filters)
 
     async def test_name_str(self, oid: ObjectId):
         filters = dict(id=str(oid))
-        await self.check_response(filters)
+        with pytest.raises(AssertionError):
+            await self.check_response(filters)
 
     @staticmethod
     async def check_response(filters):
diff --git a/tests/func/test_object_creation.py b/tests/func/test_object_creation.py
index 22b0624..3b1dc3d 100644
--- a/tests/func/test_object_creation.py
+++ b/tests/func/test_object_creation.py
@@ -9,3 +9,4 @@ async def test_create_obj(db):
     oid = await Fruit.create(f)
     assert oid is not None
     assert isinstance(oid, ObjectId)
+    await Fruit.delete(filters={})
diff --git a/tests/func/test_update.py b/tests/func/test_update.py
index d4ecb85..311bf1a 100644
--- a/tests/func/test_update.py
+++ b/tests/func/test_update.py
@@ -10,20 +10,20 @@ async def oids() -> list[ObjectId]:  # type: ignore
         Fruit(name="Banana", taste="sweet"),
         Fruit(name="Strawberry", taste="bitter"),
     ]
-    oids = await Fruit.create_many(fruits)
+    oids = await Fruit.batch_create(fruits)
     yield oids
     await Fruit.delete(filters={})
 
 
 class TestUpdateMany:
     async def test_update_many(self, oids):
-        data = dict(density=666)
+        data = Fruit(density=666)
         filters = {"_id": {"$in": oids}}
         fruits_updated = await Fruit.batch_update(data=data, filters=filters)
         assert fruits_updated == 2
 
     async def test_upsert_single(self, oids):
-        data = dict(density=666)
+        data = Fruit(density=666)
         for oid in oids:
             filters = {"_id": oid}
             upserted_count = await Fruit.upsert(data=data, filters=filters)
diff --git a/tests/schemas.py b/tests/schemas.py
index 15baa51..4ed0ecf 100644
--- a/tests/schemas.py
+++ b/tests/schemas.py
@@ -1,10 +1,10 @@
 from typing import Literal
 
-import mongow
 import pydantic
 
+import mongow
 
-class Fruit(mongow.BaseMixin):
+class Fruit(mongow.DocumentMixin):
     density: float = 1.0
     name: str
     needs_peeling: bool = pydantic.Field(