I really don't understand what this means: "random sorting for the records but also preserving the ranking"
Either you're sorting on rank or you're not. If you mean you're trying to shift things around just a little bit, *mostly* respecting relevance then I guess you can do what you're thinking. You could create your own function query to do the boosting, see: http://wiki.apache.org/solr/SolrPlugins#ValueSourceParser which would keep you from having to re-index your data to get a different "randomness". You could also consider external file fields, but I think your own function query would be cleaner. I don't think math.random is a supported function OOB Best Erick On Wed, Jan 11, 2012 at 8:29 AM, Alexandre Rocco <alel...@gmail.com> wrote: > Hello all, > > Recently i've been trying to tweak some aspects of relevancy in one listing > project. > I need to give a higher score to newer documents and also boost the > document based on a boolean field that indicates the listing has pictures. > On top of that, in some situations we need a random sorting for the records > but also preserving the ranking. > > I tried to combine some techniques described in the Solr Relevancy FAQ > wiki, but when I add the random sorting, the ranking gets messy (as > expected). > > This works well: > http://localhost:18979/solr/select/?start=0&rows=15&q={!boost%20b=recip(ms(NOW/HOUR,date_updated),3.16e-11,1,1)}active%3a%22true%22+AND+featured%3a%22false%22+_val_:%haspicture%22&fl=*,score > > This does not work, gives a random order on what is already ranked > http://localhost:18979/solr/select/?start=0&rows=15&q={!boost%20b=recip(ms(NOW/HOUR,date_updated),3.16e-11,1,1)}active%3a%22true%22+AND+featured%3a%22false%22+_val_:%haspicture%22&fl=*,score&sort=random_1+desc > > The only way I see is to create another field on the schema containing a > random value and use it to boost the document the same way that was tone on > the boolean field. > Anyone tried something like this before and knows some way to get it > working? > > Thanks, > Alexandre
