fix(access): entity field entity_type is an auto field

ref: #847

app/access/models/entity.py

@@ -70,7 +70,7 @@ class Entity(
 
 
 
-    def clean(self):
+    def clean_fields(self, exclude = None ):
 
         related_model = self.get_related_model()
 
@@ -82,6 +82,8 @@ class Entity(
 
             self.entity_type = str(related_model._meta.verbose_name).lower().replace(' ', '_')
 
+        super().clean_fields( exclude = exclude )
+
 
 
     def get_related_field_name(self) -> str: