Refactor from_table_row methods of core DB models.

[plomtask] / plomtask / db.py

diff --git a/plomtask/db.py b/plomtask/db.py
index dfb388b7ec6ed9317f19a788336025a96e4c745e..2cc1d64d54576a46a0b9c7edb513abaa28d4008e 100644 (file)
--- a/plomtask/db.py
+++ b/plomtask/db.py
@@ -1,7 +1,7 @@
 """Database management."""
 from os.path import isfile
 from difflib import Differ
-from sqlite3 import connect as sql_connect, Cursor
+from sqlite3 import connect as sql_connect, Cursor, Row
 from typing import Any, Dict
 from plomtask.exceptions import HandledException
 
@@ -73,6 +73,16 @@ class BaseModel:
     table_name = ''
     to_save: list[str] = []
     id_: None | int | str
+    id_type: type[Any] = int
+
+    @classmethod
+    def from_table_row(cls, db_conn: DatabaseConnection, row: Row) -> Any:
+        """Make from DB row, write to DB cache."""
+        obj = cls(*row)
+        assert isinstance(obj.id_, cls.id_type)
+        cache = getattr(db_conn, f'cached_{cls.table_name}')
+        cache[obj.id_] = obj
+        return obj
 
     def set_int_id(self, id_: int | None) -> None:
         """Set id_ if >= 1 or None, else fail."""