Re: [QGIS-Developer] PyQGIS code: setting filter expression for value relation widget
Hi Germán,
Thank you so much for these suggestions and code snippets.
I also came across the QgsEditorWidgetSetup - but had no idea how to use
it. The Python cookbook did not mention it. The cookbook is really great -
but for interactive forms, there is not so much information.
I will try it and report back.
Thank you very much Germán,
Andreas
On Sun, 19 Feb 2023 at 00:59, Germán Carrillo via QGIS-Developer <
qgis-developer@lists.osgeo.org> wrote:
> Hi Andreas,
>
>
> you can modify your Value Relation widget's filter expression using the
> QgsEditorWidgetSetup class, in this way:
>
> 1) Get the editor widget setup and get a copy of its config dictionary:
>
> ews = layer.editorWidgetSetup(3) # *Let's assume your Value Relation
> widget is set for a field with index 3*
> new_config = ews.config() # *We'll use the current config as a basis
> to modify only the filter expression*
>
> 2) Modify the config dict's filter expression:
>
> new_config['FilterExpression'] = 'your new expression'
>
> 3) Apply changes to your layer:
>
> new_ews = QgsEditorWidgetSetup('ValueRelation', new_config)
> layer.setEditorWidgetSetup(3, new_ews) # *Remember that 3
> corresponds to the field index*
>
> And that's it! You should have now a different set of values in the Value
> Relation widget.
>
>
> Regards,
>
> Germán
>
>
>
> El lun, 13 feb 2023 a las 5:40, Andreas Neumann via QGIS-Developer (<
> qgis-developer@lists.osgeo.org>) escribió:
>
>> Hi,
>>
>> I am looking for a code snippet in PyQGIS: how can I change the filter
>> expression for a value relation widget?
>>
>> Technically, the widget seems to be a QComboBox. I can get access to the
>> combobox, e.g. to get the current value - but how can I access the QGIS
>> related functionality, like changing programmatically settings of the value
>> relation widget , such as the filter expression? I found the
>> QgsValueRelationFieldFormatter object, but it doesn't allow me to change
>> the filter expression. Any idea how I would change the filter expression
>> using Python?
>>
>> Thank you for any hints,
>>
>> Andreas
>> ___
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>> QGIS-Developer@lists.osgeo.org
>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
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>>
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Re: [QGIS-Developer] PyQGIS code: setting filter expression for value relation widget
Hi Andreas,
you can modify your Value Relation widget's filter expression using the
QgsEditorWidgetSetup class, in this way:
1) Get the editor widget setup and get a copy of its config dictionary:
ews = layer.editorWidgetSetup(3) # *Let's assume your Value Relation
widget is set for a field with index 3*
new_config = ews.config() # *We'll use the current config as a basis
to modify only the filter expression*
2) Modify the config dict's filter expression:
new_config['FilterExpression'] = 'your new expression'
3) Apply changes to your layer:
new_ews = QgsEditorWidgetSetup('ValueRelation', new_config)
layer.setEditorWidgetSetup(3, new_ews) # *Remember that 3 corresponds
to the field index*
And that's it! You should have now a different set of values in the Value
Relation widget.
Regards,
Germán
El lun, 13 feb 2023 a las 5:40, Andreas Neumann via QGIS-Developer (<
qgis-developer@lists.osgeo.org>) escribió:
> Hi,
>
> I am looking for a code snippet in PyQGIS: how can I change the filter
> expression for a value relation widget?
>
> Technically, the widget seems to be a QComboBox. I can get access to the
> combobox, e.g. to get the current value - but how can I access the QGIS
> related functionality, like changing programmatically settings of the value
> relation widget , such as the filter expression? I found the
> QgsValueRelationFieldFormatter object, but it doesn't allow me to change
> the filter expression. Any idea how I would change the filter expression
> using Python?
>
> Thank you for any hints,
>
> Andreas
> ___
> QGIS-Developer mailing list
> QGIS-Developer@lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
>
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---
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|/
Soluciones Geoinformáticas Libres
http://geotux.tuxfamily.org/
https://twitter.com/GeoTux2
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Re: [QGIS-Developer] PyQGIS code: setting filter expression for value relation widget
Hi, I found the "QgsValueRelationSearchWidgetWrapper" class, which seems to have a "setExpression" method - but I don't know how I can access and change the QgsValueRelationSearchWidgetWrapper of an existing ComboBox in the attribute form. Andreas On 2023-02-13 11:31, Andreas Neumann via QGIS-Developer wrote: Hi, I am looking for a code snippet in PyQGIS: how can I change the filter expression for a value relation widget? Technically, the widget seems to be a QComboBox. I can get access to the combobox, e.g. to get the current value - but how can I access the QGIS related functionality, like changing programmatically settings of the value relation widget , such as the filter expression? I found the QgsValueRelationFieldFormatter object, but it doesn't allow me to change the filter expression. Any idea how I would change the filter expression using Python? Thank you for any hints, Andreas ___ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer___ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
[QGIS-Developer] PyQGIS code: setting filter expression for value relation widget
Hi, I am looking for a code snippet in PyQGIS: how can I change the filter expression for a value relation widget? Technically, the widget seems to be a QComboBox. I can get access to the combobox, e.g. to get the current value - but how can I access the QGIS related functionality, like changing programmatically settings of the value relation widget , such as the filter expression? I found the QgsValueRelationFieldFormatter object, but it doesn't allow me to change the filter expression. Any idea how I would change the filter expression using Python? Thank you for any hints, Andreas___ QGIS-Developer mailing list QGIS-Developer@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
