Disallow deletion of Processes in use.

diff --git a/plomtask/processes.py b/plomtask/processes.py
index 0a9b95b3f5faf89fd5a4a9a0991c7bb9a70ca9c5..375a0bee622081fd8690cc0e6c1a8ae5241685e1 100644 (file)
--- a/plomtask/processes.py
+++ b/plomtask/processes.py
@@ -6,7 +6,8 @@ from sqlite3 import Row
 from plomtask.db import DatabaseConnection, BaseModel
 from plomtask.misc import VersionedAttribute
 from plomtask.conditions import Condition, ConditionsRelations
-from plomtask.exceptions import NotFoundException, BadFormatException
+from plomtask.exceptions import (NotFoundException, BadFormatException,
+                                 HandledException)
 
 
 @dataclass
@@ -172,6 +173,10 @@ class Process(BaseModel[int], ConditionsRelations):
     def remove(self, db_conn: DatabaseConnection) -> None:
         """Remove from DB, with dependencies."""
         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_)

diff --git a/tests/processes.py b/tests/processes.py
index 2ac8cf4cf7787be287792b583a7402c6ed013855..c6f49265f9fdd8a9fc1d0930e36584a1a3285f59 100644 (file)
--- a/tests/processes.py
+++ b/tests/processes.py
@@ -3,6 +3,7 @@ from unittest import TestCase
 from tests.utils import TestCaseWithDB, TestCaseWithServer
 from plomtask.processes import Process, ProcessStep, ProcessStepsNode
 from plomtask.conditions import Condition
+from plomtask.todos import Todo
 from plomtask.exceptions import NotFoundException, HandledException
 
 
@@ -158,12 +159,14 @@ class TestsWithDB(TestCaseWithDB):
         self.assertEqual(self.proc1.title.history, p_loaded.title.history)
 
     def test_Process_removal(self) -> None:
-        """Test removal of Processes."""
+        """Test removal of Processes and ProcessSteps."""
         assert isinstance(self.proc3.id_, int)
         self.proc1.remove(self.db_conn)
         self.assertEqual({self.proc2.id_, self.proc3.id_},
                          set(p.id_ for p in Process.all(self.db_conn)))
         self.proc2.set_steps(self.db_conn, [(None, self.proc3.id_, None)])
+        with self.assertRaises(HandledException):
+            self.proc3.remove(self.db_conn)
         self.proc2.explicit_steps[0].remove(self.db_conn)
         retrieved = Process.by_id(self.db_conn, self.proc2.id_)
         self.assertEqual(retrieved.explicit_steps, [])
@@ -172,6 +175,12 @@ class TestsWithDB(TestCaseWithDB):
         self.proc2.remove(self.db_conn)
         with self.assertRaises(NotFoundException):
             ProcessStep.by_id(self.db_conn, step.id_)
+        todo = Todo(None, self.proc3, False, '2024-01-01')
+        todo.save(self.db_conn)
+        with self.assertRaises(HandledException):
+            self.proc3.remove(self.db_conn)
+        todo.remove(self.db_conn)
+        self.proc3.remove(self.db_conn)
 
 
 class TestsWithServer(TestCaseWithServer):