[QGIS-Developer] PyQGIS code: setting filter expression for value relation widget

[Andreas Neumann]

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
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