I'm sure that I'm doing something dumb here but I can't figure out what the issue is. I have a channel that I have constructed with

groupTuple

, that looks like:

[meta, [[file1a, file1b], [file2a, file2b], ... ]]

The second element here is an

ArrayBag

, in case that matters. I'm trying to return:

[meta, [file1a, file1b, file2a, file2b, ... ]]

I thought that

.map{meta, counts -> [meta, counts.collect()]}

would do that, but it doesn't seem to do anything

flatten.collect()

?

Thanks Rike, that does it perfectly

Just need

flatten

. You're confusing the channel operators and collection functions.

collect

is unnecessary here.