Problems to modify latitude and longitude fields manually or using phone coordinates

[aubercor]

What is the bug or the crash? What were your expectations and what actually happened?

Hello,

I created a project using QGIS 3.40 on iOS Sequoia 15.3.1.

This project contains a geopackage layer with several points.

I would like to update the longitude/latitude fields using my phone coordinates (when GNSS is ON) or manually modifying them using qfield app.

I synchronized the project to qfield cloud using the qfield sync plugin and use the last version of the qfield app on my phone (3.4.7) on Android v14.

I declared the form as follow for the latitude and longitude fields:

Do you have any suggestions to help to solve my problem?

Regards,

Coralie

Steps to reproduce the issue

Click on a point
See latitude and logitude field
Try to modify the field

Version

3.4.7

Operating system name

Android

Operating system version

14

Reinstall QField

• I have a fresh install of the latest QField version, but the problem persists.
• Problem can be reliably reproduced, doesn't happen randomly.
• Problem happens with all files and projects, not only some files or projects.

Additional context

No response

[VxTedxV]

What happens on XY if you try to modify another field of your existing point, and save it ? Are coordinates updated ?

[aubercor]

No, I can change the name of the point without any problem but none of the coordinates ($x/$y).

[VxTedxV]

Ok but do the locked coordinates changed (GPS ON, located elsewhere than where the point first created) when the entity is saved after a change in its data ?

[SeqLaz]

Hi @aubercor, could you try using coalesce(x(@gnss_coordinate)) instead of $x? Do the same for the Y coordinate, and make sure to use the Coordinate cursor locked.

[aubercor]

@SeqLaz and @VxTedxV thakns for your help.
It finally partially works with $x and $y.
Partially because, I cannot change manually latitude and longitude fields but using the phone's position (GNSS ON) works.
To proceed, I have to select the point and choose "move feature" and then, I have to zoom in on the map and select the preferred place. Then, the latitude/longitude field will be updated to the selected position on the map.
I thought it would be done automatically by using the phone's position. That's why I couldn't figure it out, and it's not that easy to find the trick.
Thanks for your help regarding all this.
Coralie