From: Christian Heller <c.heller@plomlompom.de>
Date: Wed, 1 May 2024 15:26:59 +0000 (+0200)
Subject: Improve __eq__ of BaseModel to compare all saved attributes; plus minor refactorings.
X-Git-Url: https://plomlompom.com/repos/%22https:/validator.w3.org/%7B%7Bprefix%7D%7D/foo.html?a=commitdiff_plain;h=704c00a101fc1922158a3a71a043562d34b696ad;p=plomtask

Improve __eq__ of BaseModel to compare all saved attributes; plus minor refactorings.
---

diff --git a/plomtask/days.py b/plomtask/days.py
index 78340e2..9f3aa69 100644
--- a/plomtask/days.py
+++ b/plomtask/days.py
@@ -30,14 +30,11 @@ class Day(BaseModel[str]):
     to_save = ['comment']
 
     def __init__(self, date: str, comment: str = '') -> None:
-        super().__init__(date)
-        self.id_: str = valid_date(date)
+        id_ = valid_date(date)
+        super().__init__(id_)
         self.datetime = datetime.strptime(self.date, DATE_FORMAT)
         self.comment = comment
 
-    def __eq__(self, other: object) -> bool:
-        return isinstance(other, self.__class__) and self.date == other.date
-
     def __lt__(self, other: Day) -> bool:
         return self.date < other.date
 
@@ -69,6 +66,7 @@ class Day(BaseModel[str]):
     @property
     def date(self) -> str:
         """Return self.id_ under the assumption it's a date string."""
+        assert isinstance(self.id_, str)
         return self.id_
 
     @property
@@ -90,4 +88,4 @@ class Day(BaseModel[str]):
 
     def save(self, db_conn: DatabaseConnection) -> None:
         """Add (or re-write) self to DB and cache."""
-        self.save_core(db_conn, update_with_lastrowid=False)
+        self.save_core(db_conn)
diff --git a/plomtask/db.py b/plomtask/db.py
index deeb748..34b5887 100644
--- a/plomtask/db.py
+++ b/plomtask/db.py
@@ -223,16 +223,34 @@ class BaseModel(Generic[BaseModelId]):
                 items[item.id_] = item
         return list(items.values())
 
-    def save_core(self, db_conn: DatabaseConnection,
-                  update_with_lastrowid: bool = True) -> None:
-        """Write bare-bones self (sans connected items), ensuring self.id_."""
+    def __eq__(self, other: object) -> bool:
+        if not isinstance(other, self.__class__):
+            msg = 'cannot compare to object of different class'
+            raise HandledException(msg)
+        to_hash_me = tuple([self.id_] +
+                           [getattr(self, name) for name in self.to_save])
+        to_hash_other = tuple([other.id_] +
+                              [getattr(other, name) for name in other.to_save])
+        return hash(to_hash_me) == hash(to_hash_other)
+
+    def save_core(self, db_conn: DatabaseConnection) -> None:
+        """Write bare-bones self (sans connected items), ensuring self.id_.
+
+        Write both to DB, and to cache. To DB, write .id_ and attributes
+        listed in cls.to_save.
+
+        Ensure self.id_ by setting it to what the DB command returns as the
+        last saved row's ID (cursor.lastrowid), EXCEPT if self.id_ already
+        exists as a 'str', which implies we do our own ID creation (so far
+        only the case with the Day class, where it's to be a date string.
+        """
         values = tuple([self.id_] + [getattr(self, key)
                                      for key in self.to_save])
         q_marks = DatabaseConnection.q_marks_from_values(values)
         table_name = self.table_name
         cursor = db_conn.exec(f'REPLACE INTO {table_name} VALUES {q_marks}',
                               values)
-        if update_with_lastrowid:
+        if not isinstance(self.id_, str):
             self.id_ = cursor.lastrowid  # type: ignore[assignment]
         self.cache()
 
diff --git a/plomtask/todos.py b/plomtask/todos.py
index d53674b..ecdd599 100644
--- a/plomtask/todos.py
+++ b/plomtask/todos.py
@@ -177,11 +177,11 @@ class Todo(BaseModel[int], ConditionsRelations):
                 potentially_enabled = set()
                 for child in step.children:
                     for condition in child.enables:
-                        potentially_enabled.add(condition)
+                        potentially_enabled.add(condition.id_)
                     children += [make_node(child)]
                 for condition in [c for c in step.conditions
                                   if (not c.is_active)
-                                  and (c not in potentially_enabled)]:
+                                  and (c.id_ not in potentially_enabled)]:
                     children += [make_node(condition)]
             else:
                 seen = step.id_ in seen_conditions