[QGIS-Developer] Merge tool always creating a new feature id instead of preserving the existing one

[Andreas Neumann]

Hi Alex,

Thank you for your reply.

In my case, the data resides in Postgis, not in Geopackage.

But if I understand you correctly, then Geopackage imposes it's limit on 
QGIS in general, aka other providers as well - right?

Thanks,
Andreas

On 2022-03-01 10:16, Alexandre Neto wrote:

> I believe that comes from the geopackage fid limitations. For that 
> reason, I never use the fid field as an actual id. That's my 
> workaround.
> 
> Alexandre Neto
> 
> A terça, 1/03/2022, 08:44, Andreas Neumann <a.neumann at carto.net> 
> escreveu:
> 
>> Hi,
>> 
>> We have a problem with the merge tool.
>> 
>> We have a relatively complex data model with lots of relations. We 
>> want to use the merge tool with this data.
>> 
>> The merge tool allows to carefully choose which attributes should end 
>> up in the merged feature. This works fine, except for the feature ID.
>> 
>> QGIS stubbornly insists on having to create a new feature ID after the 
>> merge - and is not reusing the feature ID of the original feature we 
>> selected as the "master" feature in the merge tool.
>> 
>> This is a huge problem - because after the merge we loose all 
>> relations, because the feature ID has changed.
>> 
>> Do you know any work around? Would we be able to fix this behaviour in 
>> a future QGIS release?
>> 
>> Thanks for the discussion,
>> 
>> Andreas _______________________________________________
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