Dynamically field selection for Solr Suggestion (Spellcheck) multiple term query

Question

I am using the solr suggestion component with the following configuration:

schema.xml

<fieldType name="textSpell" class="solr.TextField">
 <analyzer>
   <tokenizer class="solr.StandardTokenizerFactory"/>
   <filter class="solr.LowerCaseFilterFactory"/>
 </analyzer>
</fieldType>
<field name="image_memo" type="text_general"/>
<field name="username" type="text_general"/>
<field name="image_memo" type="text_general"/>
<field name="image_text" type="text_general"/>
<!-- More fields included here -->
<field name="spell" type="textSpell" indexed="true" stored="true" multiValued="true"/>
<copyField source="*" dest="spell"/>

solrconfig.xml

<searchComponent class="solr.SpellCheckComponent" name="suggest">
    <lst name="spellchecker">
        <str name="name">suggest</str>
        <str name="classname">org.apache.solr.spelling.suggest.Suggester</str>
        <str name="lookupImpl">org.apache.solr.spelling.suggest.tst.TSTLookup</str>
        <str name="field">spell</str>
        <str name="buildOnCommit">true</str>
    </lst>
</searchComponent>

<requestHandler class="org.apache.solr.handler.component.SearchHandler"
    name="/suggest">
    <lst name="defaults">
        <str name="spellcheck">true</str>
        <str name="spellcheck.dictionary">suggest</str>
        <str name="spellcheck.onlyMorePopular">true</str>
        <str name="spellcheck.count">6</str>
        <str name="spellcheck.collate">true</str>
        <str name="spellcheck.collateExtendedResults">true</str>
        <str name="spellcheck.collate">true</str>
        <str name="spellcheck.maxCollations">6</str>
        <str name="spellcheck.maxCollationTries">1000</str>
        <str name="spellcheck.extendedResults">true</str>
        <str name="spellcheck.collateParam.mm">100%</str>
    </lst>
    <arr name="components">
        <str>suggest</str>
        <str>query</str>
    </arr>
</requestHandler>

As you can see there is a field spell wich i am using for a suggestion queries. This works great even for multiple term queries.

But what I need is to search on selected fields only.
So for example I want valid suggestions only for the fields image_memo and username The user can dynamicly add and remove fields to search.

I know that I could do something like this:

q=(image_memo:*search* OR image_username:*search*)

But this is is slowing down dramtically if you got a lot of fields and a multiple term query.

Example: Searching in Field memo, username, field, field1 and field2 for term, term1 and term2.

((memo:term OR username:term OR field:term OR field1:term OR field2:term) AND (memo:term1 OR username:term1 OR field:term1 OR field1:term1 OR field2:term1) AND (memo:term2 OR username:term2 OR field:term2 OR field1:term2 OR field2:term2))

Is there any way to dynamically select the spell fields. Or is there a way that I can search for specific fields only in a multivalued field

I am using Apach Solr 4 Alpha.

Answer 1

All you need to do is use Dismax or eDismax. SpellcheckComponent automatically runs every suggestion using your query params.

So, you have to query like this:

/suggest?q={!dismax}term1 term2 term3&qf=memo username field field1 field2

or

/suggest?q=term1 term2 term3&defType=dismax&qf=memo username field field1 field2

You can implement your custom queryparser if you don't want to use (e)dismax.