Group by

[nilshoerrmann]

Is there a way to group the output of a Union Data Source by a field, e. g. a date fields that are named consistently across all united sources?

[brendo]

Not really, I wrote a long comment in the code to remind me.

Grouping will be very difficult with UnionDS. The current Grouping works on an
array level, rather then the springs to mind SQL GROUP BY. Grouping calls the
grouped field's groupRecords function, which loops over the $entries array
getting the data for the grouped field. The problem is that this uses the field_id,
so it cannot apply to other entries who are in different sections. This code untouchable
inside the Field class, so it would require something fairly crude I'd imagine to
replicate. Perhaps the $entries would have to be dissolved into same section groups and
run a group on each section before merging the array together... which has it's own set
of problems, not happening anytime soon unfortunately.