-
- @classmethod
- def get_cached(cls: type[BaseModelInstance],
- id_: BaseModelId) -> BaseModelInstance | None:
- """Get object of id_ from class's cache, or None if not found."""
- # pylint: disable=consider-iterating-dictionary
- cache = cls.get_cache()
- if id_ in cache.keys():
- obj = cache[id_]
- assert isinstance(obj, cls)
- return obj
- return None
-
- def cache(self) -> None:
- """Update object in class's cache."""
- if self.id_ is None:
- raise HandledException('Cannot cache object without ID.')
- cache = self.__class__.get_cache()
- cache[self.id_] = self
-
- def uncache(self) -> None:
- """Remove self from cache."""
- if self.id_ is None:
- raise HandledException('Cannot un-cache object without ID.')
- cache = self.__class__.get_cache()
- del cache[self.id_]
-
- @classmethod
- def empty_cache(cls) -> None:
- """Empty class's cache."""
- cls.cache_ = {}
-
- @classmethod
- def all(cls: type[BaseModelInstance],
- db_conn: DatabaseConnection) -> list[BaseModelInstance]:
- """Collect all objects of class."""
- items: dict[BaseModelId, BaseModelInstance] = {}
- for k, v in cls.get_cache().items():
- assert isinstance(v, cls)
- items[k] = v
- already_recorded = items.keys()
- for id_ in db_conn.column_all(cls.table_name, 'id'):
- if id_ not in already_recorded:
- # pylint: disable=no-member
- item = cls.by_id(db_conn, id_) # type: ignore[attr-defined]
- items[item.id_] = item
- return list(items.values())
-
- @classmethod
- def get_cache(cls: type[BaseModelInstance]) -> dict[Any, BaseModel[Any]]:
- """Get cache dictionary, create it if not yet existing."""
- if not hasattr(cls, 'cache_'):
- d: dict[Any, BaseModel[Any]] = {}
- cls.cache_ = d
- return cls.cache_