Add this variable to trigger-based templates (#72437)

add this variables to trigger-based templates

follow-up for https://github.com/home-assistant/core/issues/70359

homeassistant/components/template/trigger_entity.py

@@ -147,25 +147,32 @@ class TriggerEntity(CoordinatorEntity[TriggerUpdateCoordinator]):
     @callback
     def _process_data(self) -> None:
         """Process new data."""
+
+        this = None
+        if state := self.hass.states.get(self.entity_id):
+            this = state.as_dict()
+        run_variables = self.coordinator.data["run_variables"]
+        variables = {"this": this, **(run_variables or {})}
+
         try:
             rendered = dict(self._static_rendered)
 
             for key in self._to_render_simple:
                 rendered[key] = self._config[key].async_render(
-                    self.coordinator.data["run_variables"],
+                    variables,
                     parse_result=key in self._parse_result,
                 )
 
             for key in self._to_render_complex:
                 rendered[key] = template.render_complex(
                     self._config[key],
-                    self.coordinator.data["run_variables"],
+                    variables,
                 )
 
             if CONF_ATTRIBUTES in self._config:
                 rendered[CONF_ATTRIBUTES] = template.render_complex(
                     self._config[CONF_ATTRIBUTES],
-                    self.coordinator.data["run_variables"],
+                    variables,
                 )
 
             self._rendered = rendered

tests/components/template/test_sensor.py

@@ -624,20 +624,32 @@ async def test_sun_renders_once_per_sensor(hass, start_ha):
     }
 
 
-@pytest.mark.parametrize("count,domain", [(1, sensor.DOMAIN)])
+@pytest.mark.parametrize("count,domain", [(1, "template")])
 @pytest.mark.parametrize(
     "config",
     [
         {
+            "template": {
                 "sensor": {
-                "platform": "template",
+                    "name": "test_template_sensor",
-                "sensors": {
+                    "state": "{{ this.attributes.test }}: {{ this.entity_id }}",
-                    "test_template_sensor": {
+                    "attributes": {"test": "It {{ states.sensor.test_state.state }}"},
-                        "value_template": "{{ this.attributes.test }}: {{ this.entity_id }}",
-                        "attribute_templates": {
-                            "test": "It {{ states.sensor.test_state.state }}"
                 },
-                    }
+            },
+        },
+        {
+            "template": {
+                "trigger": {
+                    "platform": "state",
+                    "entity_id": [
+                        "sensor.test_state",
+                        "sensor.test_template_sensor",
+                    ],
+                },
+                "sensor": {
+                    "name": "test_template_sensor",
+                    "state": "{{ this.attributes.test }}: {{ this.entity_id }}",
+                    "attributes": {"test": "It {{ states.sensor.test_state.state }}"},
                 },
             },
         },