Hi,

I have vector layer (from postgis). In certain case a field is a list of field, 
with value as an id (in db) and description a description field. I use the 
function “represent_value” to translate the id to the desc when displaying 
stuff and it work great*. Now in attribute table, when you want to modify a lot 
of value, you want to use the expression dialog. In this I would like the 
inverse of represent_value that give me an id from the desc field like: 
inverse_represent_value(‘MY_DESC_VAL’, ‘myField’). Is there such a function in 
qgis ? I didn’t find it.

Thanks, Rémi Desgrange

*i’m not using join table bc it’s slow. Storing key/value in the style is 
certainly not the best stuff to do, but in my case, it works great.



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