> I just want to confirm, (as I'm not quiet familiar with the
> function query syntax) will the following query be alright
> to search "car power adaptor", so that the entry with
> highest idRank be displayed first?
> http://localhost:8983/solr/select?indent=on&q=car%20power%20adaptor&fl=id,score,name&_val_:idRank

I haven't used it but _val_ hook should be the part of q parameter.

However if you are using solr3.1 or trunk I suggest you to use sort by function 
instead.

http://wiki.apache.org/solr/FunctionQuery#Sort_By_Function

> Also, will I need to set the value of idRank for ALL items?
> Right now I have only set it for those items which are being
> returned by this query.

Not necessary to set value for ALL items. You can define default value 
(defVal="0") for missing items.

<fieldType name="file" keyField="urun_id" defVal="0" stored="false" 
indexed="false" class="solr.ExternalFileField" valType="pfloat"/>

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