Feature Layer Collection query_domains() returns and empty list from a Feature Layer in ArcGIS Online

[Clubdebambos]

Feature Layer Collection query_domains() returns and empty list from a Feature Layer in ArcGIS Online

[nanaeaubry]

@Clubdebambos Interesting, I will reach out to the Online team and see what is happening. The REST documentation implies that this property still exists: https://developers.arcgis.com/rest/services-reference/enterprise/query-domains-feature-service-.htm
Not sure why it would not show up when adding a domain.

I will keep you updated on what I find

[nanaeaubry]

@Clubdebambos
I got a reply from the team that implements this:
queryDomains is not implemented by all feature service implementations.
At this time only arcobjects FS supports it.

Users do not set supports properties - they are indicators to clients of when something is supported - when a service adds support it with advertise with a supports property. That way clients that look for the support property will just start to work with the new feature is supported. A false for a supports property (or not listing it which means false) indicates it is not supported

So it is only for arcobjects FS and hosted FS in enterprise and online will not support it.

---

We will better document this in the API as well but hope this clears it up for you

[nanaeaubry]

@Clubdebambos

Can you check in the FeatureLayerCollection if supportsQueryDomains is in the properties?
And if so, is it set to True?

If this is not the case then an empty list is returned

[Clubdebambos]

Thanks for the reply @nanaeaubry ,
There is no property called supportsQueryDomains and when I attempt to add one, although I get an indication that the addition was successful, when I access the flc properties, the property does not exist. Why wouldnt this property be automatically added when you add a domain?

from arcgis.gis import GIS
from arcgis.features import FeatureLayerCollection

"""Access AGOL"""
agol = GIS("home")

item = agol.content.get("051cfbc792854a44b4502000ba839f30")

add_dict = {
    "supportsQueryDomains": True
}

flc = FeatureLayerCollection.fromitem(item)

"""Update the JSON definition"""
status = flc.manager.add_to_definition(update_dict)
print(status)

from arcgis import GIS
from arcgis.features import FeatureLayerCollection

## connect to agol
agol = GIS("home")

## get feature service as an item object
item = agol.content.get("051cfbc792854a44b4502000ba839f30")

## create a flc object from item object
flc = FeatureLayerCollection(item.url, agol)

## print properties
print(flc.properties)`