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

[Andreas Neumann]

Hi,

I created a feature request at https://github.com/qgis/QGIS/issues/51116

The parameters need to be discussed ...

Andreas

On 2022-12-05 00:54, Nyall Dawson wrote:

> 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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