Pete, Sorry, if wasnt clear. Here is the explanation.
Suppose you have 2 records and they have films and media as 2 columns. Now first record has values like films="Indiana" and media="blue ray" and 2nd record has values like films="Bond" and media="Indiana" Values for qf parameters <str name="qf">media^2.0 films^1.0</str> Now, search for q=Indiana .. it should display both of the records but record #2 will display above than the 1st. Let me know if you still have questions. Cheers, amit Pete Smith-3 wrote: > > Hi Amit, > > Thanks very much for your reply. What you said makes things a bit > clearer but I am still a bit confused. > > On Thu, 2009-03-12 at 23:14 -0700, dabboo wrote: >> If you want to boost the records with their field value then you must use >> q >> query parameter instead of q.alt. 'q' parameter actually uses qf >> parameters >> from solrConfig for field boosting. > >>From the documentation for Dismax queries, I thought that "q" is simply > a keyword parameter: > >>From http://wiki.apache.org/solr/DisMaxRequestHandler: > q > The guts of the search defining the main "query". This is designed to be > support raw input strings provided by users with no special escaping. > '+' and '-' characters are treated as "mandatory" and "prohibited" > modifiers for the subsequent terms. Text wrapped in balanced quote > characters '"' are treated as phrases, any query containing an odd > number of quote characters is evaluated as if there were no quote > characters at all. Wildcards in this "q" parameter are not supported. > > And I thought 'qf' is a list of fields and boost scores: > >>From http://wiki.apache.org/solr/DisMaxRequestHandler: > qf (Query Fields) > List of fields and the "boosts" to associate with each of them when > building DisjunctionMaxQueries from the user's query. The format > supported is fieldOne^2.3 fieldTwo fieldThree^0.4, which indicates that > fieldOne has a boost of 2.3, fieldTwo has the default boost, and > fieldThree has a boost of 0.4 ... this indicates that matches in > fieldOne are much more significant than matches in fieldTwo, which are > more significant than matches in fieldThree. > > But if I want to, say, search for films with 'indiana' in the title, > with media=DVD scoring higher than media=BLU-RAY then do I need to do > something like: > > solr/select?q=indiana > > And in my config: > > <str name="qf">media^2</str> > > But I don't see where the actual *contents* of the media field would > determine the boost. > > Sorry if I have misunderstood what you mean. > > Cheers, > Pete > >> Pete Smith-3 wrote: >> > >> > Hi, >> > >> > I have managed to build an index in Solr which I can search on keyword, >> > produce facets, query facets etc. This is all working great. I have >> > implemented my search using a dismax query so it searches predetermined >> > fields. >> > >> > However, my results are coming back sorted by score which appears to be >> > calculated by keyword relevancy only. I would like to adjust the score >> > where fields have pre-determined values. I think I can do this with >> > boost query and boost functions but the documentation here: >> > >> > >> http://wiki.apache.org/solr/DisMaxRequestHandler#head-6862070cf279d9a09bdab971309135c7aea22fb3 >> > >> > Is not particularly helpful. I tried adding adding a bq argument to my >> > search: >> > >> > &bq=media:DVD^2 >> > >> > (yes, this is an index of films!) but I find when I start adding more >> > and more: >> > >> > &bq=media:DVD^2&bq=media:BLU-RAY^1.5 >> > >> > I find the negative results - e.g. films that are DVD but are not >> > BLU-RAY get negatively affected in their score. In the end it all seems >> > to even out and my score is as it was before i started boosting. >> > >> > I must be doing this wrong and I wonder whether "boost function" comes >> > in somewhere. Any ideas on how to correctly use boost? >> > >> > Cheers, >> > Pete >> > >> > -- >> > Pete Smith >> > Developer >> > >> > No.9 | 6 Portal Way | London | W3 6RU | >> > T: +44 (0)20 8896 8070 | F: +44 (0)20 8896 8111 >> > >> > LOVEFiLM.com >> > >> > >> > -- > Pete Smith > Developer > > No.9 | 6 Portal Way | London | W3 6RU | > T: +44 (0)20 8896 8070 | F: +44 (0)20 8896 8111 > > LOVEFiLM.com > > -- View this message in context: http://www.nabble.com/How-to-correctly-boost-results-in-Solr-Dismax-query-tp22476204p22493646.html Sent from the Solr - User mailing list archive at Nabble.com.
