Thanks for your interest in this topic. The collection operations
exist the way they do as tools distributed with the core framework
because they can't be expressed as normal tools and they utilize
abstractions that I don't consider public at this time (or really have
any confidence in making public). For this reason I think it would be
best to just implement a collection operation inside of the core
framework - Philip Mabon created such an operation as part of this
https://github.com/galaxyproject/galaxy/pull/2771 and it was merged.
I think the kinds of things that would benefit from collection
operations tend to be expressible in fairly generic terms so they
don't apply to just one field. I think your relabelling example is
exactly such a case. I have opened a PR with the start of such as tool
that I hope would address your use case with
https://github.com/galaxyproject/galaxy/pull/3603. I'm calling it
relabelling from a file because I'd also like to implement a
relabelling with a function someday but there has been some push back
on extending these collection operations to consume small functions.
Even if that were implemented though - the use case of reading from a
file is pretty different and frankly probably more practical for
typical workflows that might make use of these.
Perhaps we can continue this conversation on the #3603.
On Mon, Feb 13, 2017 at 11:11 AM, Peter Briggs
> Dear Developers
> Is there an existing tool or mechanism that can be used to duplicate a "list
> of pairs" dataset collection, keeping the paired datasets the same but
> relabeling each pair with a new identifier taken from a user supplied file
> or list?
> I've cobbled together my own tool to try and do something like this:
> and while it works, it doesn't feel like a good solution as it creates
> duplicates of the datasets from the first collection and consumes additional
> disk/quota space unnecessarily. (This is particularly undesirable as we
> expect that the input collections might be relatively large numbers of FASTQ
> pairs e.g. 30 or more.)
> Looking at some of the 'Collection Operations' tools that come with Galaxy,
> it appears that these are able to create new collections without making
> duplicate datasets, which seems much better. But these tools work by
> directly invoking Python classes from the Galaxy core, so I don't know if a
> similar approach could be used in a non-core tool.
> Any advice or suggestions are very welcome! Thanks
> Best wishes
> Peter Briggs peter.bri...@manchester.ac.uk
> Bioinformatics Core Facility University of Manchester
> B.1083 Michael Smith Bldg Tel: (0161) 2751482
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