ruby on rails - Conditional order_by depending on data in Sunspot -


i wondering if there way sort using kind of if/then semantics sort order.

the basic requirement trying adress this:

  • my records have contact_again_time time attribute can nil.
  • the list should sorted in way records have contact_again_time come first ordered contact_again_time descending.
  • the rest contact_again_time nil should ordered created_at in ascending.

so off top of head solve materializing order field index having searchable this:

integer :sort_key                                                                                                                                                contact_again_time.nil? ? (created_at.to_i * -1) : contact_again_time.to_i                                                                                      end

and order_by(:sort_key, :desc) want. way putting part of sort logic inside model , more importantly inside lucene index.

something i'd rather avoid feels rather wrong.

in solr, can adding sort parameter query: sort=contact_again_time desc,created_at asc

whenever contact_again_time present, sort in descending order (and use created_at break ties, irrelevant you). when created_at present sorted in ascending order.

this should translate in straight-forward manner sunspot.

update: if want sort sort=contact_again_time asc,created_at asc documents contact_again_time missing first, mention in comment below. push these documents end, add sortmissinglast="true" contact_again_time in solr schema.xml. if created_at can absent in documents , desire same behavior, should add sortmissinglast too.


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