Custom integration, check if entity exists before creating it

snaky69 · October 12, 2023, 12:09am

Good day,

I am helping on the development of a custom integration. One thing that has been bothering me for a while is that I get an error Entity id already exists every time I reboot HA.

I believe it is caused by the following “for” loop:

for d in hilo.devices.all: 
     LOG.debug(f"Adding device {d}") 
     new_entities.extend(generate_entities_from_device(d, hilo, scan_interval)) 
     if d.has_attribute("power"): 
         # If we opt out the geneneration of meters we just create the power sensors 
         if generate_energy_meters: 
             create_energy_entity(d)

I looked at the documentation but unless I looked wrong I was not able to locate a way to check if an entity already exists before creating it.

I’m not too sure how to check the entity registry and run the for loop against it.

Any pointer or help would be appreciated!

msp1974 · October 24, 2023, 11:11am

Im not sure being able to check the entity exists before creating it is your issue here. It maybe that you are trying to create the same entity more than once, in which case, you need to look at this. If you want to post a link to your full code, happy to have a look for you and give some pointers.

snaky69 · February 13, 2024, 3:02pm

Thank you Mark. Sorry for the late reply I never received the notification.

Further digging has lead me to see that line 159 of this file is responsible

github.com

dvd-dev/hilo/blob/48368a92796b6c0f5b81f9a8ae6ea15ce19e5105/custom_components/hilo/sensor.py

"""Support for various Hilo sensors."""
from __future__ import annotations

from datetime import datetime, timedelta, timezone

from homeassistant.components.integration.sensor import METHOD_LEFT, IntegrationSensor
from homeassistant.components.sensor import (
    SensorDeviceClass,
    SensorEntity,
    SensorStateClass,
)
from homeassistant.config_entries import ConfigEntry
from homeassistant.const import (
    CONCENTRATION_PARTS_PER_MILLION,
    CONF_SCAN_INTERVAL,
    CURRENCY_DOLLAR,
    PERCENTAGE,
    SIGNAL_STRENGTH_DECIBELS_MILLIWATT,
    Platform,
    UnitOfEnergy,

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This calls line 24 in this file:

github.com

dvd-dev/hilo/blob/48368a92796b6c0f5b81f9a8ae6ea15ce19e5105/custom_components/hilo/managers.py

from collections import OrderedDict
from datetime import timedelta

from homeassistant.components.energy.data import async_get_manager
from homeassistant.components.utility_meter import async_setup as utility_setup
from homeassistant.components.utility_meter.const import DOMAIN as UTILITY_DOMAIN
from homeassistant.components.utility_meter.sensor import (
    async_setup_platform as utility_setup_platform,
)

from .const import HILO_ENERGY_TOTAL, LOG


class UtilityManager:
    """Class that maps to the utility_meters"""

    def __init__(self, hass, period):
        self.hass = hass
        self.period = period
        self.meter_configs = OrderedDict()

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I am under the impression that line 29 of managers.py is not doings its job. Logging shows I’m not going through it at all.