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add states() example to considerations (#25289)

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Marius 2022-12-19 15:48:57 +01:00 committed by GitHub
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source/_integrations/template.markdown
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@ -329,7 +329,9 @@ If the template accesses every state on the system, a rate limit of one update p
### Startup
If you are using the state of a platform that might not be available during startup, the Template Sensor may get an `unknown` state. To avoid this, use `is_state()` function in your template. For example, you would replace {% raw %}`{{ states.switch.source.state == 'on' }}`{% endraw %} with this equivalent that returns `true`/`false` and never gives an `unknown` result:
If you are using the state of a platform that might not be available during startup, the Template Sensor may get an `unknown` state. To avoid this, use the `states()` function in your template. For example, you should replace {% raw %}`{{ states.sensor.moon.state }}`{% endraw %} with this equivalent that returns the state and never results in `unknown`: {% raw %}`{{ states('sensor.moon') }}` {% endraw %}.
The same would apply to the `is_state()` function. You should replace {% raw %}`{{ states.switch.source.state == 'on' }}`{% endraw %} with this equivalent that returns `true`/`false` and never gives an `unknown` result:
{% raw %}