Custom sorting of Solr Results

[Sandeep Mestry <sa...@gmail.com>]

Dear Experts,

>
> I have a requirement for the exact matches and applying alphabetical
> sorting thereafter.
>
> To illustrate, the results should be sorted in exact matches and all later
> alphabetical.
>
> So, if there are 5 documents as below
>
> Doc1
> title: trees
>
> Doc 2
> title: plum trees
>
> Doc 3
> title: Money Trees (Legendary Trees)
>
> Doc 4
> title: Cork Trees
>
> Doc 5
> title: Old Trees
>
> Then, if user searches with query term as 'trees', the results should be
> in following order:
>
> Doc 1 trees - Highest Rank
> Doc 4 Cork Trees - Alphabetical afterwards..
> Doc 3 Money Trees (Legendary Trees)
> Doc 5 Old Trees
> Doc 2 plum trees
>
> I can achieve the alphabetical sorting by adding the title sort parameter, However,
> Solr relevancy is higher for Doc 3 (due to matches in 2 terms and so it arranges
> Doc 3 above Doc 4, 5 and 2).
> So, it looks like:
>
> Doc 1 trees - Highest Rank
> Doc 3 Money Trees (Legendary Trees)
> Doc 4 Cork Trees - Alphabetical afterwards..
> Doc 5 Old Trees
> Doc 2 plum trees
>
> Can you tell me an easy way to achieve this requirement please?
>
> I'm using Solr 4.0 and the *title *field is defined as follows:
>
> <fieldType name="text_wc" class="solr.TextField"
> positionIncrementGap="100" >
>             <analyzer type="index">
>                 <tokenizer class="solr.WhitespaceTokenizerFactory"/>
>                 <filter class="solr.WordDelimiterFilterFactory"
> stemEnglishPossessive="0" generateWordParts="1" generateNumberParts="1"
> catenateWords="1" catenateNumbers="1" catenateAll="1" splitOnCaseChange="1"
> splitOnNumerics="0" preserveOriginal="1" />
>                 <filter class="solr.LowerCaseFilterFactory"/>
>             </analyzer>
>             <analyzer type="query">
>                 <tokenizer class="solr.WhitespaceTokenizerFactory"/>
>                 <filter class="solr.WordDelimiterFilterFactory"
> stemEnglishPossessive="0" generateWordParts="1" generateNumberParts="1"
> catenateWords="1" catenateNumbers="1" catenateAll="1" splitOnCaseChange="1"
> splitOnNumerics="0" preserveOriginal="1" />
>                 <filter class="solr.LowerCaseFilterFactory"/>
>             </analyzer>
>         </fieldType>
>
>
>
> Many Thanks in advance,
> Sandeep
>