Hi all,
after some tests made on a custom geopackage, but the same happens also
with Postgres, it seems to me that N:M realtions, when adding a child,
are broken.
After playing a little bit, adding existing children to the parent works
fine, while the problem is when adding a new child from the parent form:
the id of the child foreign key seems to be saved immediately when
opening the form and the final result is an empty value in the pivot table.
Also the exercise in the documentation seems not working for both
postgres (same error described above) and geopackage.
(https://docs.qgis.org/3.34/en/docs/user_manual/working_with_vector/joins_relations.html#many-to-many-n-m-relations)
I opened a ticket with a small example:
https://github.com/qgis/QGIS/issues/59546
Thanks for any feedback
Cheers
Matteo
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