X-Git-Url: https://plomlompom.com/repos/%7B%7Bdb.prefix%7D%7D/todo?a=blobdiff_plain;f=plomtask%2Fprocesses.py;h=c4ccfa8fd3926491bf1a52fc3c2c36d6d271cd63;hb=10af8a54a17047a4554d4b8d051a238271c74906;hp=0a9b95b3f5faf89fd5a4a9a0991c7bb9a70ca9c5;hpb=6ec09c59e388711c43d9eba787c65ff8f60b9ce1;p=plomtask

diff --git a/plomtask/processes.py b/plomtask/processes.py
index 0a9b95b..c4ccfa8 100644
--- a/plomtask/processes.py
+++ b/plomtask/processes.py
@@ -4,9 +4,10 @@ from dataclasses import dataclass
 from typing import Set, Any
 from sqlite3 import Row
 from plomtask.db import DatabaseConnection, BaseModel
-from plomtask.misc import VersionedAttribute
+from plomtask.versioned_attributes import VersionedAttribute
 from plomtask.conditions import Condition, ConditionsRelations
-from plomtask.exceptions import NotFoundException, BadFormatException
+from plomtask.exceptions import (NotFoundException, BadFormatException,
+                                 HandledException)
 
 
 @dataclass
@@ -170,8 +171,15 @@ class Process(BaseModel[int], ConditionsRelations):
             step.save(db_conn)
 
     def remove(self, db_conn: DatabaseConnection) -> None:
-        """Remove from DB, with dependencies."""
+        """Remove from DB, with dependencies.
+
+        Guard against removal of Processes in use.
+        """
         assert isinstance(self.id_, int)
+        for _ in db_conn.row_where('process_steps', 'step_process', self.id_):
+            raise HandledException('cannot remove Process in use')
+        for _ in db_conn.row_where('todos', 'process', self.id_):
+            raise HandledException('cannot remove Process in use')
         db_conn.delete_where('process_conditions', 'process', self.id_)
         db_conn.delete_where('process_enables', 'process', self.id_)
         db_conn.delete_where('process_disables', 'process', self.id_)