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

   1 """Non-doable elements of ProcessStep/Todo chains."""
   2 from __future__ import annotations
   3 from plomtask.db import DatabaseConnection, BaseModel
   4 from plomtask.versioned_attributes import VersionedAttribute
   5 from plomtask.exceptions import HandledException
   6
   7
   8 class Condition(BaseModel[int]):
   9     """Non-Process dependency for ProcessSteps and Todos."""
  10     table_name = 'conditions'
  11     to_save = ['is_active']
  12     to_save_versioned = ['title', 'description']
  13     to_search = ['title.newest', 'description.newest']
  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     def remove(self, db_conn: DatabaseConnection) -> None:
  23         """Remove from DB, with VersionedAttributes.
  24
  25         Checks for Todos and Processes that depend on Condition, prohibits
  26         deletion if found.
  27         """
  28         if self.id_ is None:
  29             raise HandledException('cannot remove unsaved item')
  30         for item in ('process', 'todo'):
  31             for attr in ('conditions', 'blockers', 'enables', 'disables'):
  32                 table_name = f'{item}_{attr}'
  33                 for _ in db_conn.row_where(table_name, 'condition', self.id_):
  34                     raise HandledException('cannot remove Condition in use')
  35         super().remove(db_conn)
  36
  37
  38 class ConditionsRelations:
  39     """Methods for handling relations to Conditions, for Todo and Process."""
  40
  41     def __init__(self) -> None:
  42         self.conditions: list[Condition] = []
  43         self.blockers: list[Condition] = []
  44         self.enables: list[Condition] = []
  45         self.disables: list[Condition] = []
  46
  47     def set_conditions(self, db_conn: DatabaseConnection, ids: list[int],
  48                        target: str = 'conditions') -> None:
  49         """Set self.[target] to Conditions identified by ids."""
  50         target_list = getattr(self, target)
  51         while len(target_list) > 0:
  52             target_list.pop()
  53         for id_ in ids:
  54             target_list += [Condition.by_id(db_conn, id_)]
  55
  56     def set_blockers(self, db_conn: DatabaseConnection,
  57                      ids: list[int]) -> None:
  58         """Set self.enables to Conditions identified by ids."""
  59         self.set_conditions(db_conn, ids, 'blockers')
  60
  61     def set_enables(self, db_conn: DatabaseConnection,
  62                     ids: list[int]) -> None:
  63         """Set self.enables to Conditions identified by ids."""
  64         self.set_conditions(db_conn, ids, 'enables')
  65
  66     def set_disables(self, db_conn: DatabaseConnection,
  67                      ids: list[int]) -> None:
  68         """Set self.disables to Conditions identified by ids."""
  69         self.set_conditions(db_conn, ids, 'disables')