Open Stack

On Mon, Aug 29, 2016 at 04:03:27PM +0200, Thomas Herve wrote:
> On Mon, Aug 29, 2016 at 3:16 PM, Steven Hardy <shardy at redhat.com> wrote:
> > On Mon, Aug 29, 2016 at 07:07:09AM +0200, Thomas Herve wrote:
> >> dict($.groupBy($.keys().toList()[0], $.values().toList()[0][0]))
> >>
> >> ought to work, I believe?
> >
> > So, as it turns out, my example above was bad, and groupBy only works if
> > you have a list of maps with exactly one key, we actually need this:
> >
> >   # Example of tripleo format
> >   # We need an output of
> >   # "gnocchi_metricd_node_names": ["overcloud-controller-0"]
> >   # "tripleo_packages_node_names": ["overcloud-controller-0", "overcloud-compute-0"]
> >   # "nova_compute_node_names": ["overcloud-compute-0"]
> >   debug_tripleo:
> >     value:
> >       yaql:
> >         expression: dict($.data.l.groupBy($.keys().toList()[0], $.values().toList()[0][0]))
> >         data:
> >           l:
> >             - "gnocchi_metricd_node_names": ["overcloud-controller-0"]
> >               "tripleo_packages_node_names": ["overcloud-controller-0"]
> >             - "nova_compute_node_names": ["overcloud-compute-0"]
> >               "tripleo_packages_node_names": ["overcloud-compute-0"]
> >
> > So, I'm back to wondering how we make the intermediate assignement of tripleo_packages_node_names
> 
> Well I didn't know all the constraints :).

Heh, thanks for the help, I appreciate it!

> $.selectMany($.items()).groupBy($[0], $[1][0])
> 
> is another attempt. It won't work if you have more than one value per
> key in the original data, but I think it will handle multiple keys.

Yeah, that gets us closer, but we do need to handle more than one value
(list entry) per key, e.g:

         data:
           l:
             - "gnocchi_metricd_node_names": ["a0", "a1", "a2"]
               "tripleo_packages_node_names": ["a0", "a1", "a2"]
             - "nova_compute_node_names": ["b0"]
               "tripleo_packages_node_names": ["b0"]

Output needs to be like:

             "gnocchi_metricd_node_names": ["a0", "a1", "a2"]
             "tripleo_packages_node_names": ["a0", "a1", "a2", "b0"]
             "nova_compute_node_names": ["b0"]

I'm almost tempted to just write a map_deep_merge patch for heat, but I'm
guessing we won't be able to land it for newton at this point anyway.

Thanks!

Steve