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notes on using states(xxx) vs states.xxx (#9687)

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* notes on using states(xxx) vs states.xxx 

as per this discussion - https://community.home-assistant.io/t/using-better-templates-with-state/122912/14

* ✏️ Moved content to warning message.

* ✏️ Tweak
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akasma74 2019-06-28 21:16:17 +01:00 committed by Franck Nijhof
parent 1defd6c2d0
commit 04ea9a1ebf
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8
source/_docs/configuration/templating.markdown
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@ -57,18 +57,24 @@ script:
Extensions allow templates to access all of the Home Assistant specific states and adds other convenience functions and filters.
### {% linkable_title States %}
- Iterating `states` will yield each state sorted alphabetically by entity ID.
- Iterating `states.domain` will yield each state of that domain sorted alphabetically by entity ID.
- `states.sensor.temperature` returns the state object for `sensor.temperature`.
- `states.sensor.temperature` returns the state object for `sensor.temperature` (avoid when possible, see note below).
- `states('device_tracker.paulus')` will return the state string (not the object) of the given entity or `unknown` if it doesn't exist.
- `is_state('device_tracker.paulus', 'home')` will test if the given entity is the specified state.
- `state_attr('device_tracker.paulus', 'battery')` will return the value of the attribute or None if it doesn't exist.
- `is_state_attr('device_tracker.paulus', 'battery', 40)` will test if the given entity attribute is the specified state (in this case, a numeric value).
<p class='note warning'>
Avoid using `states.sensor.temperature`, instead use `states('sensor.temperature')`. It is strongly advised to use the `states()`, `is_state()`, `state_attr()` and `is_state_attr()` as much as possible, to avoid errors and error message when the entity isn't ready yet (e.g., during Home Assistant startup).
</p>
Besides the normal [state object methods and properties](/topics/state_object/), `states.sensor.temperature.state_with_unit` will print the state of the entity and, if available, the unit.
#### {% linkable_title States examples %}
The next two statements result in the same value if the state exists. The second one will result in an error if the state does not exist.
{% raw %}