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

[Alexandre Neto]

I would consider that a bug then, but I can't remember if I ever used merge
tool on PostGIS tables directly. I believe NaturalGIS has some processing
tools that work in PostGIS backend, but can't remember if merge is
available.

Alexandre

A terça, 1/03/2022, 09:24, Andreas Neumann <a.neumann at carto.net> escreveu:

> 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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