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

[Andreas Neumann]

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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