plomlompom.com Git - plomtask/blob - plomtask/conditions.py

   1 """Non-doable elements of ProcessStep/Todo chains."""
   2 from __future__ import annotations
   3 from typing import Any
   4 from sqlite3 import Row
   5 from plomtask.db import DatabaseConnection, BaseModel
   6 from plomtask.versioned_attributes import VersionedAttribute
   7 from plomtask.exceptions import HandledException
   8
   9
  10 class Condition(BaseModel[int]):
  11     """Non-Process dependency for ProcessSteps and Todos."""
  12     table_name = 'conditions'
  13     to_save = ['is_active']
  14
  15     def __init__(self, id_: int | None, is_active: bool = False) -> None:
  16         super().__init__(id_)
  17         self.is_active = is_active
  18         self.title = VersionedAttribute(self, 'condition_titles', 'UNNAMED')
  19         self.description = VersionedAttribute(self, 'condition_descriptions',
  20                                               '')
  21
  22     @classmethod
  23     def from_table_row(cls, db_conn: DatabaseConnection,
  24                        row: Row | list[Any]) -> Condition:
  25         """Build condition from row, including VersionedAttributes."""
  26         condition = super().from_table_row(db_conn, row)
  27         for name in ('title', 'description'):
  28             table_name = f'condition_{name}s'
  29             for row_ in db_conn.row_where(table_name, 'parent', row[0]):
  30                 getattr(condition, name).history_from_row(row_)
  31         return condition
  32
  33     def save(self, db_conn: DatabaseConnection) -> None:
  34         """Save self and its VersionedAttributes to DB and cache."""
  35         self.save_core(db_conn)
  36         self.title.save(db_conn)
  37         self.description.save(db_conn)
  38
  39     def remove(self, db_conn: DatabaseConnection) -> None:
  40         """Remove from DB, with VersionedAttributes.
  41
  42         Checks for Todos and Processes that depend on Condition, prohibits
  43         deletion if found.
  44         """
  45         if self.id_ is None:
  46             raise HandledException('cannot remove unsaved item')
  47         for item in ('process', 'todo'):
  48             for attr in ('conditions', 'enables', 'disables'):
  49                 table_name = f'{item}_{attr}'
  50                 for _ in db_conn.row_where(table_name, 'condition', self.id_):
  51                     raise HandledException('cannot remove Condition in use')
  52         db_conn.delete_where('condition_titles', 'parent', self.id_)
  53         db_conn.delete_where('condition_descriptions', 'parent', self.id_)
  54         super().remove(db_conn)
  55
  56
  57 class ConditionsRelations:
  58     """Methods for handling relations to Conditions, for Todo and Process."""
  59
  60     def set_conditions(self, db_conn: DatabaseConnection, ids: list[int],
  61                        target: str = 'conditions') -> None:
  62         """Set self.[target] to Conditions identified by ids."""
  63         target_list = getattr(self, target)
  64         while len(target_list) > 0:
  65             target_list.pop()
  66         for id_ in ids:
  67             target_list += [Condition.by_id(db_conn, id_)]
  68
  69     def set_enables(self, db_conn: DatabaseConnection,
  70                     ids: list[int]) -> None:
  71         """Set self.enables to Conditions identified by ids."""
  72         self.set_conditions(db_conn, ids, 'enables')
  73
  74     def set_disables(self, db_conn: DatabaseConnection,
  75                      ids: list[int]) -> None:
  76         """Set self.disables to Conditions identified by ids."""
  77         self.set_conditions(db_conn, ids, 'disables')