[Qgis-user] QGIS - value relation widget

[Blumentrath, Stefan]

Thanks Matthias! Cool stuff!
There is happening so much with and around QGIS, it is hard keep up-to-date with the developers pace ...
I am definitely gonna use this one!

Cheers
Stefan

From: qgis-user-bounces at lists.osgeo.org [mailto:qgis-user-bounces at lists.osgeo.org] On Behalf Of Matthias Kuhn
Sent: 2. oktober 2015 09:25
To: qgis-user at lists.osgeo.org
Subject: Re: [Qgis-user] QGIS - value relation widget

Hi Luca

Would this core functionality of QGIS be an option for you?

https://www.qgis.org/en/site/forusers/visualchangelog210/index.html#feature-filter-chaining-for-relation-reference-widget

If you are still required to use python in your forms: are you using global variables? They can be an issue for embedded forms.

Cheers,
Matthias
On 10/02/2015 09:09 AM, Luca Lanteri wrote:
Sadly, after further test I discover that the crashes remain, so I think it is a qgis bug and not a problem in my code.
The problem happens when I put my custom form into a subform widget (QgsRelationEditorWidget). If I add a new record in the subform and I move to another record using the left column QGIS crashes. It seems to be a more general problem because the crash appears also when I add some simple control that modify the object in the form.

I can open a ticket and add some test data.
If it is a minor bug and it could be resolved easily I really offer a pizza and a beer to resolve it.

All the best
Luca


2015-10-01 23:53 GMT+02:00 Luca Lanteri <mescal72 at gmail.com<mailto:mescal72 at gmail.com>>:
Hi,
now I'm already using the python logic but my code is terrible and I have a lot of crash problem.
Now that I using your example all is easier and seem to worsk fine.
I owe you one beer.
Many many tanks !

Luca

2015-10-01 22:23 GMT+02:00 Blumentrath, Stefan <Stefan.Blumentrath at nina.no<mailto:Stefan.Blumentrath at nina.no>>:
Hi Luca,

Sounds like a case for Python logic!
General principles are explained here:
http://nathanw.net/2011/09/05/qgis-tips-custom-feature-forms-with-python-logic/

Also nice, and probably exactly what you are looking for:
http://medspx.fr/blog/Qgis/cascade_forms/

Cheers
Stefan

From: qgis-user-bounces at lists.osgeo.org<mailto:qgis-user-bounces at lists.osgeo.org> [mailto:qgis-user-bounces at lists.osgeo.org<mailto:qgis-user-bounces at lists.osgeo.org>] On Behalf Of Luca Lanteri
Sent: 1. oktober 2015 22:07
To: qgis-user <Qgis-user at lists.osgeo.org<mailto:Qgis-user at lists.osgeo.org>>
Subject: [Qgis-user] QGIS - value relation widget

Hi to all,

I need to build a form when the value of a combo are filtered basing on the value of anoter combobox.
I have a first combo where I choose the region and a second with the municipalities.
I need that the second combo shows only the municipalities of the choosed region.
I tried to use use the widget "relationship value" with the a filter like classe_munic = attribute($currentfeature, 'classe_munic') without any success.

Has anyone ever done something similar?
Thank in advance

Luca






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