Hi all,
has anyone had any luck getting the subject browse/facets to ignore
diacritics when sorting the subject terms? Right now (5.x, XMLUI,
discovery), we get a sort order like this:
manager
Manuka Leaf Oil
Manukau
Manukau Harbour
marginal groups
marginal value theorem
Maze procedure
Mānuka Honey
in browse and
manager
Manuka Leaf Oil
Manukau
Manukau Harbour
marginal groups
marginal value theorem
Maze procedure
mythology
Mānuka Honey
in the facet listing.
I've been asked whether it's possible to change the sort order such that
"Mānuka" gets sorted between "manager" and "Manukau" -- that is, as if
there was no diacritic. The subject terms should remain listed with
their actual values though (it's not an option to simply strip out the
diacritics during indexing).
I have vague memories that we managed to tweak this behaviour by
configuring the collation locale in PostgreSQL, back in the
database-backed browse. Obviously that doesn't work with Discovery.
I tried a few changes to the Solr schema for the discovery core, but
none appeared to do what I want. Based on the UnicodeCollation page in
the Solr wiki [1], it looks like configuring collation for a sort field
might be the way to go; it isn't possible to set up collation for the
subject field/s because then the stored value changes to a binary
representation of the metadata value that includes the collation key. I
imagine this would work for title browse, where the results (=DSpace
items) are sorted by one of the configured sort fields. However, the
subject browse listings (where the results are metadata values)
ultimately come from a facet query, and facet.sort only takes "count" or
"index" as its values [2] -- it doesn't look like it's possible to add
collation into the mix there.
Does anyone have any thoughts on this?
cheers,
Andrea
[1]: https://wiki.apache.org/solr/UnicodeCollation
[2]: https://wiki.apache.org/solr/SimpleFacetParameters#facet.sort
--
Dr Andrea Schweer
Lead Software Developer, ITS Information Systems
The University of Waikato, Hamilton, New Zealand
+64-7-837 9120
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