+ def matching(cls: type[BaseModelInstance], db_conn: DatabaseConnection,
+ pattern: str) -> list[BaseModelInstance]:
+ """Return all objects whose .to_search match pattern."""
+ items = cls.all(db_conn)
+ if pattern:
+ filtered = []
+ for item in items:
+ for attr_name in cls.to_search:
+ toks = attr_name.split('.')
+ parent = item
+ for tok in toks:
+ attr = getattr(parent, tok)
+ parent = attr
+ if pattern in attr:
+ filtered += [item]
+ break
+ return filtered
+ return items
+
+ def save(self, db_conn: DatabaseConnection) -> None:
+ """Write self to DB and cache and ensure .id_.
+
+ Write both to DB, and to cache. To DB, write .id_ and attributes
+ listed in cls.to_save[_versioned|_relations].
+
+ Ensure self.id_ by setting it to what the DB command returns as the
+ last saved row's ID (cursor.lastrowid), EXCEPT if self.id_ already
+ exists as a 'str', which implies we do our own ID creation (so far
+ only the case with the Day class, where it's to be a date string.
+ """
+ values = tuple([self.id_] + [getattr(self, key)
+ for key in self.to_save])
+ q_marks = DatabaseConnection.q_marks_from_values(values)
+ table_name = self.table_name
+ cursor = db_conn.exec(f'REPLACE INTO {table_name} VALUES {q_marks}',
+ values)
+ if not isinstance(self.id_, str):
+ self.id_ = cursor.lastrowid # type: ignore[assignment]
+ self.cache()
+ for attr_name in self.to_save_versioned:
+ getattr(self, attr_name).save(db_conn)
+ for table, column, attr_name in self.to_save_relations:
+ assert isinstance(self.id_, (int, str))
+ db_conn.rewrite_relations(table, column, self.id_,
+ [[i.id_] for i
+ in getattr(self, attr_name)])
+
+ def remove(self, db_conn: DatabaseConnection) -> None:
+ """Remove from DB and cache, including dependencies."""
+ if self.id_ is None or self.__class__.get_cached(self.id_) is None:
+ raise HandledException('cannot remove unsaved item')
+ for attr_name in self.to_save_versioned:
+ getattr(self, attr_name).remove(db_conn)
+ for table, column, attr_name in self.to_save_relations:
+ db_conn.delete_where(table, column, self.id_)
+ self.uncache()
+ db_conn.delete_where(self.table_name, 'id', self.id_)