Calculate score according to another indexed field

[Pragyanshis Pattanaik]

Hi,

My schema is like below
<fields>   
    <field name="ProductId" type="int" indexed="true" stored="true" />    
    <field name="ProductName" type="string" indexed="true" stored="true" 
required="true" />
    <field name="ProductDesription" type="string" indexed="true" stored="true" 
required="true" />
    <field name="ProductRating" type="int" indexed="true" stored="true" 
required="true" />
</fields>

Product name will be passed as q parameter to solr.
Is there a way to affect score on the basis of "ProductRating" which is not 
passed as query parameter ?


Or I need to go to solr source code and change the ranking algorithm ?

Please Guide me.

Thanks in advance