Dear all,
As a learning experience I am trying to make an application that was
developed with python 2 and qgis 2 with a postgres backend of vs 9.3
work with python 3/qgis 3/postgres 13.
As expected, there are plenty of places where it is still not working as
it should, but I have managed to upgrade the database, open the project
file in qgis 3.16, and all the layers (based on views) have loaded
correctly. The relationships that were stored in the project file also
seem to be working correctly with the existing .ui files. I can open the
parent layer form, and in the child form I can see the foreign key
reflected properly, and changing as the selected parent feature is
changed. All the relationship settings were set manually and stored in
the project file. When I change the column preview on the left hand side
of the form from parentid to any other column, the child form still
shows the parentid correctly.
For testing/learning purposed I did the whole process manually from
scratch in 3.16. When I now open the parent layer form, and set the
column preview on the left of the form to anything else than the
parentid, in the child form, where I would have expected the parentid as
before, it shows the column used in the column preview.
Is this the expected behaviour? Is it possible to set this to the 'old'
behavior? If so, can that also be done using python (ultimately I want
to load the layers and create the relationships in python)? Below some
screenshots to clarify what I described.
Thanks for your help,
Janneke
Original situation (A), behaviour as expected:
A) With locationid as column preview shows corresponding locationid in
child form (the number 1)
The same when changing the column preview: (now locationid in child form
is number 11288)
B) Manually newly created relationships, with column preview of the
parent id shows it in the child form (note that there seems to be a box
in front of another box, in another situation I have seen it looking
like a greyed out combo box)
With the newly created relationship, when selecting districtid as a
column preview, it is the district id that is shown in the child form,
not the locationid.
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