validate many is None for run_many usage

kgforge/specializations/models/demo_model.py

@@ -94,11 +94,15 @@ def _validate_one(self, resource: Resource, type_: str, inference: str) -> None:
         If the resource is not typed, AttributeError is raised
         """
         type_expanded = self.service.expand(type_)
+
         schema = self.service.schema(type_expanded)
         result, reason = self.service.check(resource, schema)
         if reason is not None:
             raise ValidationError(reason)
 
+    _validate_many = None
+
+
     # Utils.
 
     @staticmethod
@@ -124,13 +128,6 @@ def _generate_context(self) -> Dict:
     def schema_id(self, type: str) -> str:
         raise not_supported()
 
-    def _validate_many(
-        self, resources: List[Resource], type_: str, inference: str
-    ) -> None:
-
-        for resource in resources:
-            self._validate_one(resource, type_, inference)
-
 
 class ModelLibrary:
     """Simulate a third-party library handling interactions with the data used by the model."""