Add function get_value for FSMContext

aiogram/fsm/context.py

@@ -20,6 +20,9 @@ class FSMContext:
     async def get_data(self) -> Dict[str, Any]:
         return await self.storage.get_data(key=self.key)
 
+    async def get_value(self, key: str) -> Any:
+        return await self.storage.get_value(key=self.key, data_key=key)
+
     async def update_data(
         self, data: Optional[Dict[str, Any]] = None, **kwargs: Any
     ) -> Dict[str, Any]:

aiogram/fsm/storage/base.py

@@ -64,6 +64,17 @@ class BaseStorage(ABC):
         """
         pass
 
+    async def get_value(self, key: StorageKey, data_key: str) -> Any:
+        """
+        Get selected value by key in current data
+
+        :param key: storage key
+        :param data_key: key of selected data
+        :return: value of current data by key
+        """
+        current_data = await self.get_data(key=key)
+        return current_data[data_key]
+
     async def update_data(self, key: StorageKey, data: Dict[str, Any]) -> Dict[str, Any]:
         """
         Update date in the storage for key (like dict.update)