Solr exact word search

Question

I want to configure my Solr search engine so I get an exact match for the search term I enter.

eg. 'taxes' should return documents with 'taxes' and not 'tax', 'taxation' etc.

Any help or tips would be appreciated.

Answer 1

I presume your field is a TextField, by default solr does a fuzzy search on this field. What you want is to set up your field as a string field and add no tokenizer then you'll get an exact match.

You can even combine the exact search with a fuzzy search and use DisMax to boost the relative weights.

Example (schema.xml) :

<field name="name"             type="string" indexed="true" stored="false" required="true" /> <field name="nameString"       type="string" indexed="true" stored="false" required="true" /> <copyField source="name" dest="nameString"/> 

Example (solrconfig.xml) :

<requestHandler name="accounts" class="solr.SearchHandler">     <lst name="defaults">       <str name="defType">dismax</str>       <str name="qf">         nameString^10.0 name^5.0 description^1.0       </str>       <str name="tie">0.1</str>     </lst>   </requestHandler> 

Answer 2

To turn off stemming in your schema.xml, you can define text field like this:

<types>     <!-- other fields definition -->     <fieldType name="text_no_stem" class="solr.TextField" omitNorms="false">       <analyzer>           <tokenizer class="solr.StandardTokenizerFactory"/>           <filter class="solr.StandardFilterFactory"/>           <filter class="solr.LowerCaseFilterFactory"/>       </analyzer>    </fieldType>     <!-- other fields definition -->  </types>  <fields>     <!-- other fields definition -->     <dynamicField name="*_nostem" type="text_no_stem" indexed="true" stored="true"/>     <!-- other fields definition -->  </fields> 

I'm using sunspot to integrate solr with Ruby on Rails. With this in the schema.xml I define my searchable block like this:

searchable do     text(:wants, as: :wants_nostem) end