flatten not consistently working for template sensor

[DarthSonic]

What version of Spook are you using?

3.0.1

What version of Home Assistant are you using?

2024.5.3

The problem

I created a template sensor in configuration. yaml. I am using flatten within the state template. When loading the yaml in developer tools, everything works. When restarting HA, the sensor gets unavailable and error log shows that flatten function is unknown.

Is there a way to overcome that issue?

Anything in the logs? Paste it here!

No response

[caphm]

I've got the same issue. I'm using flatten filter in a template within a script. Home assistant disables that script because it claims it could not be validated:
„invalid template (TemplateAssertionError: No filter named 'flatten'.) for dictionary value @ data['sequence'][1]['variables']['result']. Got '{{ { "entity_id": (entities + areas|map("area_entities")|flatten + labels|map("label_entities")|flatten)|unique|list } }}'“.

[Phileep]

I have the same issue with the shuffle helper being used in scripts.

After restart, the script is disabled as invalid due to shuffle being used.

relevant log excerpts:

2025-01-17 08:32:43.613 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration spook which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant

2025-01-17 08:32:43.615 WARNING (SyncWorker_0) [homeassistant.loader] We found a custom integration spook_inverse which has not been tested by Home Assistant. This component might cause stability problems, be sure to disable it if you experience issues with Home Assistant

2025-01-17 08:34:24.252 ERROR (MainThread) [homeassistant.components.script] Script with alias 'dont stop the music' could not be validated and has been disabled: invalid template (TemplateAssertionError: No filter named 'shuffle'.) for dictionary value @ data['sequence'][0]['variables']['artist_list']. Got '{{ (( state_attr("input_select.music_artists_favourite","options")  |  shuffle | list )[:(number_of_artists - random_artists_tracks )]  + ( state_attr("input_select.music_artists","options")  | shuffle | list )[:(random_artists_tracks )] | shuffle) }}\n'

Running spook v 3.1.0 installed via HACS.
Home assistant core 20251.2

To get it working again I need to touch the script and then it usually will validate ok and work again.

[jeverley]

I'm also encountering this issue when trying to flatten the list returned from device_trackers.
It works perfectly fine, but is flagged by Spook on startup with (TemplateAssertionError: No filter named 'flatten'.)

I've found that the following filter works as an alternative in my use case (to flatten a list of lists):

| reject("none") | sum(start=[])

[frenck]

Unfortunately, not something I think I can fix.

The problem is timing in how Spook hooks into Home Assistant.
At this point, I have come to the conclusion that offering templating methods this way is not feasible. I'm looking into seeing if we can move some of these methods directly into the Home Assistant project and removing them from Spook.

../Frenck

[SLaks]

home-assistant/core#140157 fixes this