trim sand
I'm trying to select the battery entities of certain device types only, e.g. switches. The only way I can think of to do that is to look at all entities of the same device and see if there is an entity of a certain device type, e.g. switch, present on the same device, but I have no idea how to do even that.
Is this even possible? Or am I going about this in entirely the wrong way?
gentle glen
Something like this?
{{ states.switch | selectattr('attributes.device_class', 'defined') | selectattr('attributes.device_class', 'eq', 'battery') | list }}
That unfortunately won't work. You see, what I have is a device with two entities one with the device class battery and one with the device class temperature. I want to select e.g. all the sensor entities with certain characteristics (e.g. a certain device class) that belong to a device which also has another entity with certain defined characteristics.
afaik, the battery is always in the sensor domain.
Maybe I should give you a bit of background here: I've got a dashboard which displays all battery states, and for ease of reading I'd like to group same ones together.
wintry dragon
I think you need to refine what "switch device type" actually means. AFAIK that's not a thing. Lots of devices might have switch entities that are not switches. Like any kind of configuration setting would present as a switch entity.
trim sand
Yeah, let's forget about the switch. That was just an example that popped into my mind because I have a lot of battery-operated switch modules. It might as well be a thermometer or a plant sensor.
selecting entities based on the presence of other entities on the same device
I could generalize my requirement to "selecting entites based on the presence of other entities on the same device", and I've renamed the post accordingly.
... I'm digging under the fence again, ain't I?
gentle glen
I mean ... yes, it's possible but you're likely not going to get a general solution since the criteria are going to make up the majority of the logic.
You're likely start the the set of "presence of other entities" and resolve that to a set of devices, and then expand that to the set of all entities across those devices and then filter down to the ones you care about.
Obviously an example... but something along the lines of your initial request
{% set devices = states | selectattr('attributes.device_class', 'defined') | selectattr('attributes.device_class', 'eq', 'battery') | map(attribute='entity_id') | map('device_id') | select('!=', None) | unique | list %}
{{ devices | map('device_entities') | sum(start=[]) | expand | selectattr('domain','eq','switch') | list }}