Deprecate template.attach (#124843)

homeassistant/helpers/template.py

@@ -81,6 +81,7 @@ from . import (
     label_registry,
     location as loc_helper,
 )
+from .deprecation import deprecated_function
 from .singleton import singleton
 from .translation import async_translate_state
 from .typing import TemplateVarsType
@@ -207,15 +208,24 @@ def async_setup(hass: HomeAssistant) -> bool:
 
 
 @bind_hass
+@deprecated_function(
+    "automatic setting of Template.hass introduced by HA Core PR #89242",
+    breaks_in_ha_version="2025.10",
+)
 def attach(hass: HomeAssistant, obj: Any) -> None:
+    """Recursively attach hass to all template instances in list and dict."""
+    return _attach(hass, obj)
+
+
+def _attach(hass: HomeAssistant, obj: Any) -> None:
     """Recursively attach hass to all template instances in list and dict."""
     if isinstance(obj, list):
         for child in obj:
-            attach(hass, child)
+            _attach(hass, child)
     elif isinstance(obj, collections.abc.Mapping):
         for child_key, child_value in obj.items():
-            attach(hass, child_key)
-            attach(hass, child_value)
+            _attach(hass, child_key)
+            _attach(hass, child_value)
     elif isinstance(obj, Template):
         obj.hass = hass
 

tests/components/script/test_blueprint.py

@@ -109,7 +109,6 @@ async def test_confirmable_notification(
     assert len(mock_call_action.mock_calls) == 1
     _hass, config, variables, _context = mock_call_action.mock_calls[0][1]
 
-    template.attach(hass, config)
     rendered_config = template.render_complex(config, variables)
 
     assert rendered_config == {

tests/helpers/test_service.py

@@ -39,7 +39,6 @@ from homeassistant.helpers import (
     device_registry as dr,
     entity_registry as er,
     service,
-    template,
 )
 import homeassistant.helpers.config_validation as cv
 from homeassistant.loader import async_get_integration
@@ -565,9 +564,6 @@ async def test_not_mutate_input(hass: HomeAssistant) -> None:
     config = cv.SERVICE_SCHEMA(config)
     orig = cv.SERVICE_SCHEMA(orig)
 
-    # Only change after call is each template getting hass attached
-    template.attach(hass, orig)
-
     await service.async_call_from_config(hass, config, validate_config=False)
     assert orig == config