Hi Nyall,
I tested recent master, which contains your fix about virtual fields
with relation_aggregate expressions
(https://github.com/qgis/QGIS/commit/4e5597ab72e689d117a980dd00efbf52558b95d5)
, but unfortunately I am not able to display the aggregated values in
the virtual field.
Here is my expression:
relation_aggregate(relation:='rel_anlage_sondengruppe',aggregate:='sum',
expression:="anzahl_sonden")
The preview of the expression result in the expression editor works
fine, but the values in the attribute table are all 'NULL' ;-)
-------------------
I also noticed a small error in the help text of the
"relation_aggregate" expression:
the documentation always talks about a "calculation" parameter, but it
only works with a parameter named "expression". See my example above.
So I believe the help text needs to be corrected.
Thanks,
Andreas
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