Another implementation of undo/redo

src/core/settings_management.py

@@ -98,10 +98,10 @@ class SettingsManager:
     user_id, user_email = self._get_user(session)
     return self._db_engine.save(user_id, user_email, entry, obj)
   
-  def load(self, session: dict, entry: str, default=NoDefault):
+  def load(self, session: dict, entry: str, digest=None, default=NoDefault):
     user_id, _ = self._get_user(session)
     try:
-      return self._db_engine.load(user_id, entry)
+      return self._db_engine.load(user_id, entry, digest)
     except DbException:
       return default
   
@@ -128,6 +128,14 @@ class SettingsManager:
     
     return self._db_engine.exists(user_id, entry)
   
+  def get_digest(self, session: dict, entry: str):
+    user_id, _ = self._get_user(session)
+    return self._db_engine.get_digest(user_id, entry)
+  
+  def history(self, session, entry, digest=None, max_items=1000):
+    user_id, _ = self._get_user(session)
+    return self._db_engine.history(user_id, entry, digest, max_items)
+  
   def get_db_engine(self):
     return self._db_engine
   
@@ -177,7 +185,7 @@ class GenericDbManager:
     if key.startswith("_"):
       super().__setattr__(key, value)
     
-    settings = self._settings_manager.load(self._session, self._obj_entry, self._obj_type())
+    settings = self._settings_manager.load(self._session, self._obj_entry, default=self._obj_type())
     if not (hasattr(settings, key)):
       raise AttributeError(f"Settings '{self._obj_entry}' has no attribute '{key}'.")
     
@@ -188,7 +196,7 @@ class GenericDbManager:
     if item.startswith("_"):
       return super().__getattribute__(item)
     
-    settings = self._settings_manager.load(self._session, self._obj_entry, self._obj_type())
+    settings = self._settings_manager.load(self._session, self._obj_entry, default=self._obj_type())
     if not (hasattr(settings, item)):
       raise AttributeError(f"Settings '{self._obj_entry}' has no attribute '{item}'.")
     
@@ -250,7 +258,7 @@ class NestedSettingsManager:
     self._settings_manager.save(self._session, self._obj_entry, settings)
   
   def _get_settings_and_object(self):
-    settings = self._settings_manager.load(self._session, self._obj_entry, self._obj_type())
+    settings = self._settings_manager.load(self._session, self._obj_entry, default=self._obj_type())
     if not hasattr(settings, self._obj_attribute):
       raise AttributeError(f"Settings '{self._obj_entry}' has no attribute '{self._obj_attribute}'.")