Update modified_at datetime on storage collection changes (home-assis…

…tant#125218)

homeassistant/helpers/collection.py

@@ -7,6 +7,7 @@
 from collections.abc import Awaitable, Callable, Coroutine, Iterable
 from dataclasses import dataclass
 from functools import partial
+from hashlib import md5
 from itertools import groupby
 import logging
 from operator import attrgetter
@@ -25,6 +26,7 @@
 from . import entity_registry
 from .entity import Entity
 from .entity_component import EntityComponent
+from .json import json_bytes
 from .storage import Store
 from .typing import ConfigType, VolDictType
 
@@ -50,6 +52,7 @@ class CollectionChange:
     change_type: str
     item_id: str
     item: Any
+    item_hash: str | None = None
 
 
 type ChangeListener = Callable[
@@ -273,7 +276,9 @@ async def async_load(self) -> None:
 
         await self.notify_changes(
             [
-                CollectionChange(CHANGE_ADDED, item[CONF_ID], item)
+                CollectionChange(
+                    CHANGE_ADDED, item[CONF_ID], item, self._hash_item(item)
+                )
                 for item in raw_storage["items"]
             ]
         )
@@ -313,7 +318,16 @@ async def async_create_item(self, data: dict) -> _ItemT:
         item = self._create_item(item_id, validated_data)
         self.data[item_id] = item
         self._async_schedule_save()
-        await self.notify_changes([CollectionChange(CHANGE_ADDED, item_id, item)])
+        await self.notify_changes(
+            [
+                CollectionChange(
+                    CHANGE_ADDED,
+                    item_id,
+                    item,
+                    self._hash_item(self._serialize_item(item_id, item)),
+                )
+            ]
+        )
         return item
 
     async def async_update_item(self, item_id: str, updates: dict) -> _ItemT:
@@ -331,7 +345,16 @@ async def async_update_item(self, item_id: str, updates: dict) -> _ItemT:
         self.data[item_id] = updated
         self._async_schedule_save()
 
-        await self.notify_changes([CollectionChange(CHANGE_UPDATED, item_id, updated)])
+        await self.notify_changes(
+            [
+                CollectionChange(
+                    CHANGE_UPDATED,
+                    item_id,
+                    updated,
+                    self._hash_item(self._serialize_item(item_id, updated)),
+                )
+            ]
+        )
 
         return self.data[item_id]
 
@@ -365,6 +388,10 @@ def _base_data_to_save(self) -> SerializedStorageCollection:
     def _data_to_save(self) -> _StoreT:
         """Return JSON-compatible date for storing to file."""
 
+    def _hash_item(self, item: dict) -> str:
+        """Return a hash of the item."""
+        return md5(json_bytes(item)).hexdigest()
+
 
 class DictStorageCollection(StorageCollection[dict, SerializedStorageCollection]):
     """A specialized StorageCollection where the items are untyped dicts."""
@@ -464,6 +491,10 @@ async def _remove_entity(self, change_set: CollectionChange) -> None:
 
     async def _update_entity(self, change_set: CollectionChange) -> None:
         if entity := self.entities.get(change_set.item_id):
+            if change_set.item_hash:
+                self.ent_reg.async_update_entity_options(
+                    entity.entity_id, "collection", {"hash": change_set.item_hash}
+                )
             await entity.async_update_config(change_set.item)
 
     async def _collection_changed(self, change_set: Iterable[CollectionChange]) -> None:

tests/helpers/test_collection.py

@@ -2,8 +2,10 @@
 
 from __future__ import annotations
 
+from datetime import timedelta
 import logging
 
+from freezegun.api import FrozenDateTimeFactory
 import pytest
 import voluptuous as vol
 
@@ -15,6 +17,7 @@
     storage,
 )
 from homeassistant.helpers.typing import ConfigType
+from homeassistant.util.dt import utcnow
 
 from tests.common import flush_store
 from tests.typing import WebSocketGenerator
@@ -254,6 +257,84 @@ async def test_storage_collection(hass: HomeAssistant) -> None:
     }
 
 
+async def test_storage_collection_update_modifiet_at(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    freezer: FrozenDateTimeFactory,
+) -> None:
+    """Test that updating a storage collection will update the modified_at datetime in the entity registry."""
+
+    entities: dict[str, TestEntity] = {}
+
+    class TestEntity(MockEntity):
+        """Entity that is config based."""
+
+        def __init__(self, config: ConfigType) -> None:
+            """Initialize entity."""
+            super().__init__(config)
+            self._state = "initial"
+
+        @classmethod
+        def from_storage(cls, config: ConfigType) -> TestEntity:
+            """Create instance from storage."""
+            obj = super().from_storage(config)
+            entities[obj.unique_id] = obj
+            return obj
+
+        @property
+        def state(self) -> str:
+            """Return state of entity."""
+            return self._state
+
+        def set_state(self, value: str) -> None:
+            """Set value."""
+            self._state = value
+            self.async_write_ha_state()
+
+    store = storage.Store(hass, 1, "test-data")
+    data = {"id": "mock-1", "name": "Mock 1", "data": 1}
+    await store.async_save(
+        {
+            "items": [
+                data,
+            ]
+        }
+    )
+    id_manager = collection.IDManager()
+    ent_comp = entity_component.EntityComponent(_LOGGER, "test", hass)
+    await ent_comp.async_setup({})
+    coll = MockStorageCollection(store, id_manager)
+    collection.sync_entity_lifecycle(hass, "test", "test", ent_comp, coll, TestEntity)
+    changes = track_changes(coll)
+
+    await coll.async_load()
+    assert id_manager.has_id("mock-1")
+    assert len(changes) == 1
+    assert changes[0] == (collection.CHANGE_ADDED, "mock-1", data)
+
+    modified_1 = entity_registry.async_get("test.mock_1").modified_at
+    assert modified_1 == utcnow()
+
+    freezer.tick(timedelta(minutes=1))
+
+    updated_item = await coll.async_update_item("mock-1", {"data": 2})
+    assert id_manager.has_id("mock-1")
+    assert updated_item == {"id": "mock-1", "name": "Mock 1", "data": 2}
+    assert len(changes) == 2
+    assert changes[1] == (collection.CHANGE_UPDATED, "mock-1", updated_item)
+
+    modified_2 = entity_registry.async_get("test.mock_1").modified_at
+    assert modified_2 > modified_1
+    assert modified_2 == utcnow()
+
+    freezer.tick(timedelta(minutes=1))
+
+    entities["mock-1"].set_state("second")
+
+    modified_3 = entity_registry.async_get("test.mock_1").modified_at
+    assert modified_3 == modified_2
+
+
 async def test_attach_entity_component_collection(hass: HomeAssistant) -> None:
     """Test attaching collection to entity component."""
     ent_comp = entity_component.EntityComponent(_LOGGER, "test", hass)