[QGIS-Developer] Question on current_value() expression in the context of filtering relation reference combo boxes

[Alessandro Pasotti]

Sorry, I just realized that you are using relation-reference widgets
and not value-relation widgets.

I don't think that the current_(parent)_value will work in that case,
it wasn't implemented.

Cheers

On Tue, Dec 6, 2022 at 3:59 PM Andreas Neumann via QGIS-Developer
<qgis-developer at lists.osgeo.org> wrote:
>
> Hi,
>
> In one of my form setups,  I would like to filter one relation reference widget combo box with a filter expression based on the selected entry of another relation reference value.
>
> A static filter like:
>
> szenario_art = 'Brand'
>
> works as expected and it returns the filtered values - but as soon as I try to base it on the value of another relation reference widget, it fails ...
>
> I tried
>
> szenario_art = current_value('szenario_art')
>
> but no records get selected.
>
>
> Questions:
>
> Does the current_value() return the "internal value" or the "human readable" value?
> Do I have to eval() something in the filter expression?
> Is there a way to test "current_value" somehow? I tried to write the changed value into another text widget (with default values on update), but it will always return "NULL". In the expression editor, I also always get "NULL" in the preview.
>
> Thank you for your help,
>
> Andreas
>
>
>
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-- 
Alessandro Pasotti
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