On cache emptying, also ._disappear() any objects held in it.

[plomtask] / plomtask / db.py

diff --git a/plomtask/db.py b/plomtask/db.py
index 99998a6ab29f760ba0d62f90395739dad4b521ff..385e79855286c45087537b3b63b8b024fd553ca0 100644 (file)
--- a/plomtask/db.py
+++ b/plomtask/db.py
@@ -271,6 +271,26 @@ class BaseModel(Generic[BaseModelId]):
         assert isinstance(other.id_, int)
         return self.id_ < other.id_
 
+    @property
+    def as_dict(self) -> dict[str, object]:
+        """Return self as (json.dumps-coompatible) dict."""
+        d: dict[str, object] = {'id': self.id_}
+        if len(self.to_save_versioned) > 0:
+            d['_versioned'] = {}
+        for k in self.to_save:
+            attr = getattr(self, k)
+            if hasattr(attr, 'as_dict'):
+                d[k] = attr.as_dict
+            d[k] = attr
+        for k in self.to_save_versioned:
+            attr = getattr(self, k)
+            assert isinstance(d['_versioned'], dict)
+            d['_versioned'][k] = attr.history
+        for r in self.to_save_relations:
+            attr_name = r[2]
+            d[attr_name] = [x.as_dict for x in getattr(self, attr_name)]
+        return d
+
     # cache management
     # (we primarily use the cache to ensure we work on the same object in
     # memory no matter where and how we retrieve it, e.g. we don't want
@@ -295,7 +315,13 @@ class BaseModel(Generic[BaseModelId]):
 
     @classmethod
     def empty_cache(cls) -> None:
-        """Empty class's cache."""
+        """Empty class's cache, and disappear all former inhabitants."""
+        # pylint: disable=protected-access
+        # (cause we remain within the class)
+        if hasattr(cls, 'cache_'):
+            to_disappear = list(cls.cache_.values())
+            for item in to_disappear:
+                item._disappear()
         cls.cache_ = {}
 
     @classmethod
@@ -349,8 +375,14 @@ class BaseModel(Generic[BaseModelId]):
                        # pylint: disable=unused-argument
                        db_conn: DatabaseConnection,
                        row: Row | list[Any]) -> BaseModelInstance:
-        """Make from DB row, update DB cache with it."""
+        """Make from DB row (sans relations), update DB cache with it."""
         obj = cls(*row)
+        assert obj.id_ is not None
+        for attr_name in cls.to_save_versioned:
+            attr = getattr(obj, attr_name)
+            table_name = attr.table_name
+            for row_ in db_conn.row_where(table_name, 'parent', obj.id_):
+                attr.history_from_row(row_)
         obj._cache()
         return obj