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Reporter MartinNYHC opened the Add Smart Plug dialog in HA mode, typed
a search prefix matching a multi-entity device (one switch.* plus
several sensor.*/binary_sensor.* siblings under the same friendly
name), clicked one of the non-switch siblings, and got a 422 on Save:
String should match pattern
'^(switch|light|input_boolean|script)\.[a-z0-9_]+$'
The screenshot confirms the bug shape — the X button next to the
"empty-looking" Select Entity field only renders when haEntityId is
truthy. So haEntityId was set, but selectedEntity (haEntities.find by
that id) returned undefined, so the input rendered the placeholder
text instead of the friendly-name display. That can only happen when
the user had earlier picked an entity whose domain is NOT in the
schema's allowed list, then the search cleared, the entity-list
refetched without a search param, and the refreshed list (filtered to
the default domains) no longer contained the user's pick.
Root cause was in HomeAssistantService.list_entities: when a search
query was present, the function bypassed the domain filter entirely
and returned matches across every HA domain. Offering a clickable
choice the schema can't accept is broken UX, and the cryptic Pydantic
pattern echo on save made it look like a backend/schema problem
rather than a search-permissiveness problem. Confirmed via git diff
that the smart-plug code path is unchanged between v0.2.4 and
0.2.4.1 — this has been latent since the script-domain commit in
February 2026, only noticed now because the reporter hadn't reopened
the modal in months.
Fix: always apply the allowed-domains filter ({switch, light,
input_boolean, script} — kept in sync with the regex in
backend/app/schemas/smart_plug.py:17). Search composes on top as a
substring match against entity_id or friendly_name, instead of
replacing the domain filter. Whitespace-only search strings now
fall back to the no-search behavior.