tidy(mm): remove update method from ModelConfigBase

It's only used in the soon-to-be-removed model merge logic

invokeai/backend/model_manager/config.py

@@ -129,7 +129,6 @@ class ModelConfigBase(BaseModel):
     key: str = Field(description="unique key for model", default="<NOKEY>")
     hash: Optional[str] = Field(description="original fasthash of model contents", default=None)
     description: Optional[str] = Field(description="human readable description of the model", default=None)
-    source: Optional[str] = Field(description="model original source (path, URL or repo_id)", default=None)
 
     @staticmethod
     def json_schema_extra(schema: dict[str, Any], model_class: Type[BaseModel]) -> None:
@@ -141,11 +140,6 @@ class ModelConfigBase(BaseModel):
         json_schema_extra=json_schema_extra,
     )
 
-    def update(self, attributes: Dict[str, Any]) -> None:
-        """Update the object with fields in dict."""
-        for key, value in attributes.items():
-            setattr(self, key, value)  # may raise a validation error
-
 
 class CheckpointConfigBase(ModelConfigBase):
     """Model config for checkpoint-style models."""

invokeai/backend/model_manager/merge.py

@@ -163,12 +163,8 @@ class ModelMerger(object):
 
         # update model's config
         model_config = self._installer.record_store.get_model(key)
-        model_config.update(
-            {
-                "name": merged_model_name,
-                "description": f"Merge of models {', '.join(model_names)}",
-                "vae": vae,
-            }
-        )
+        model_config.name = merged_model_name
+        model_config.description = f"Merge of models {', '.join(model_names)}"
+
         self._installer.record_store.update_model(key, model_config)
         return model_config