diff --git a/README.md b/README.md
index 648f72b..82b3d31 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ Based on [Officially Supported Databases](https://docs.djangoproject.com/en/3.0/
 pip install casbin-django-orm-adapter
 ```
 
-Add `casbin_adapter.apps.CasbinAdapterConfig` to your `INSTALLED_APPS`
+Add `casbin_adapter` to your `INSTALLED_APPS`
 
 ```python
 # settings.py
@@ -36,7 +36,7 @@ BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 
 INSTALLED_APPS = [
     ...
-    'casbin_adapter.apps.CasbinAdapterConfig',
+    'casbin_adapter',
     ...
 ]
 
diff --git a/casbin_adapter/apps.py b/casbin_adapter/apps.py
index 2674874..28d3b75 100644
--- a/casbin_adapter/apps.py
+++ b/casbin_adapter/apps.py
@@ -6,7 +6,5 @@ class CasbinAdapterConfig(AppConfig):
     name = "casbin_adapter"
 
     def ready(self):
-        from .enforcer import initialize_enforcer
-
-        db_alias = getattr(settings, "CASBIN_DB_ALIAS", "default")
-        initialize_enforcer(db_alias)
+        from .enforcer import enforcer
+        enforcer.db_alias = getattr(settings, "CASBIN_DB_ALIAS", "default")
diff --git a/casbin_adapter/enforcer.py b/casbin_adapter/enforcer.py
index 70d2eaf..4e0d583 100644
--- a/casbin_adapter/enforcer.py
+++ b/casbin_adapter/enforcer.py
@@ -43,9 +43,9 @@ def _load(self):
                 self.set_role_manager(role_manager)
 
     def __getattribute__(self, name):
-        safe_methods = ["__init__", "_load", "_initialized"]
+        safe_methods = ["__init__", "__class__", "_load", "_initialized", "db_alias"]
         if not super().__getattribute__("_initialized") and name not in safe_methods:
-            initialize_enforcer(self.db_alias)
+            initialize_enforcer(super().__getattribute__("db_alias"))
             if not super().__getattribute__("_initialized"):
                 raise Exception(
                     (