[Qgis-user] QGIS - value relation widget

[Matthias Kuhn]

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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