[QGIS-Developer] QGIS expression to get internal ID of a feature in a related layer

[Nyall Dawson]

On Wed, 30 Nov 2022 at 00:06, Andreas Neumann via QGIS-Developer
<qgis-developer at lists.osgeo.org> wrote:
>
> Hi,
>
> I am looking for a way to find out the internal id of a related layer with a QGIS expression.
>
> @id and $id only work directly on the feature of the source layer, but not on related layers.
>
> attributes(
>    get_feature(
>       'Other Related Layer',
>       't_id',
>       fkey_value
>    )
> )
>
> doesn't contain the internal id of the other layer ...
>
> Any ideas how to get access to internal ids of other layers?

This is indeed a silly limitation -- we need a "feature_id(...)"
expression function!

Can you file a feature request for this?

Nyall


>
> Thank you and greetings,
>
> Andreas
>
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