feat: Model is now optional for initializing a BaseService

Author: Hongbin Huang

easy/domain/orm.py

@@ -12,19 +12,20 @@
 
 
 class DjangoOrmModel(CrudModel):
-    def __init__(self, model: Type[models.Model]):
+    def __init__(self, model: Optional[Type[models.Model]] = None) -> None:
         self.model = model
-        config = ModelMetaConfig()
-        exclude_list = config.get_final_excluded_list(self.model())
-        self.m2m_fields_list: List = list(
-            _field
-            for _field in self.model._meta.get_fields(include_hidden=True)
-            if (
-                isinstance(_field, models.ManyToManyField)
-                and ((_field not in exclude_list) if exclude_list else True)
+        if self.model:
+            config = ModelMetaConfig()
+            exclude_list = config.get_final_excluded_list(self.model())
+            self.m2m_fields_list: List = list(
+                _field
+                for _field in self.model._meta.get_fields(include_hidden=True)
+                if (
+                    isinstance(_field, models.ManyToManyField)
+                    and ((_field not in exclude_list) if exclude_list else True)
+                )
             )
-        )
-        super().__init__(self.model)
+            super().__init__(self.model)
 
     def _separate_payload(self, payload: Dict) -> Tuple[Dict, Dict]:
         m2m_fields = {}

easy/services/base.py

@@ -1,5 +1,5 @@
 import logging
-from typing import Type
+from typing import Optional, Type
 
 from django.db import models
 
@@ -10,9 +10,6 @@
 
 
 class BaseService(CrudService, PermissionService):
-    def __init__(
-        self,
-        model: Type[models.Model],
-    ):
+    def __init__(self, model: Optional[Type[models.Model]] = None):
         self.model = model
         super().__init__(model=self.model)

easy/services/crud.py

@@ -1,5 +1,5 @@
 import logging
-from typing import Any, Type
+from typing import Any, Optional, Type
 
 from asgiref.sync import sync_to_async
 from django.db import models
@@ -10,7 +10,7 @@
 
 
 class CrudService(DjangoOrmModel):
-    def __init__(self, model: Type[models.Model]):
+    def __init__(self, model: Optional[Type[models.Model]] = None):
         super().__init__(model)
         self.model = model