Added matchoffset setting to MLT querytype (closes #233)

library/Solarium/QueryType/MoreLikeThis/Query.php

@@ -70,6 +70,7 @@ class Query extends SelectQuery
         'fields'        => '*,score',
         'interestingTerms' => 'none',
         'matchinclude'  => false,
+        'matchoffset'   => 0,
         'stream'        => false,
         'omitheader'    => true,
     );
@@ -174,6 +175,30 @@ class Query extends SelectQuery
         return $this->getOption('matchinclude');
     }
 
+    /**
+     * Set the mlt.match.offset parameter, which determines the which result from the query should be used for MLT
+     * For paging of MLT use setStart / setRows
+     *
+     * @see http://wiki.apache.org/solr/MoreLikeThisHandler#Params
+     *
+     * @param  int  $offset
+     * @return self Provides fluent interface
+     */
+    public function setMatchOffset($offset)
+    {
+        return $this->setOption('matchoffset', $offset);
+    }
+
+    /**
+     * Get the mlt.match.offset parameter.
+     *
+     * @return int
+     */
+    public function getMatchOffset()
+    {
+        return $this->getOption('matchoffset');
+    }
+
     /**
      * Set MLT fields option
      *

library/Solarium/QueryType/MoreLikeThis/RequestBuilder.php

@@ -63,7 +63,7 @@ class RequestBuilder extends SelectRequestBuilder
         // add mlt params to request
         $request->addParam('mlt.interestingTerms', $query->getInterestingTerms());
         $request->addParam('mlt.match.include', $query->getMatchInclude());
-        $request->addParam('mlt.match.offset', $query->getStart());
+        $request->addParam('mlt.match.offset', $query->getMatchOffset());
         $request->addParam('mlt.fl', implode(',', $query->getMltFields()));
         $request->addParam('mlt.mintf', $query->getMinimumTermFrequency());
         $request->addParam('mlt.mindf', $query->getMinimumDocumentFrequency());

tests/Solarium/Tests/QueryType/MoreLikeThis/QueryTest.php

@@ -439,6 +439,7 @@ class QueryTest extends \PHPUnit_Framework_TestCase
                     )
                 ),
             ),
+            'matchoffset' => 15,
             'resultclass' => 'MyResultClass',
             'documentclass' => 'MyDocumentClass',
         );
@@ -451,6 +452,7 @@ class QueryTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals($config['start'], $query->getStart());
         $this->assertEquals($config['documentclass'], $query->getDocumentClass());
         $this->assertEquals($config['resultclass'], $query->getResultClass());
+        $this->assertEquals($config['matchoffset'], $query->getMatchOffset());
         $this->assertEquals('published:true', $query->getFilterQuery('pub')->getQuery());
         $this->assertEquals('online:true', $query->getFilterQuery('online')->getQuery());
 
@@ -664,6 +666,17 @@ class QueryTest extends \PHPUnit_Framework_TestCase
         );
     }
 
+    public function testSetAndGetMatchOffset()
+    {
+        $value = 20;
+        $this->query->setMatchOffset($value);
+
+        $this->assertEquals(
+            $value,
+            $this->query->getMatchOffset()
+        );
+    }
+
     public function testSetAndGetMltFields()
     {
         $value = 'name,description';

tests/Solarium/Tests/QueryType/MoreLikeThis/RequestBuilderTest.php

@@ -58,6 +58,7 @@ class RequestBuilderTest extends \PHPUnit_Framework_TestCase
         $this->query->setInterestingTerms('test');
         $this->query->setMatchInclude(true);
         $this->query->setStart(12);
+        $this->query->setMatchOffset(15);
         $this->query->setMltFields('description,name');
         $this->query->setMinimumTermFrequency(1);
         $this->query->setMinimumDocumentFrequency(3);
@@ -74,7 +75,7 @@ class RequestBuilderTest extends \PHPUnit_Framework_TestCase
             array(
                 'mlt.interestingTerms' => 'test',
                 'mlt.match.include' => 'true',
-                'mlt.match.offset' => 12,
+                'mlt.match.offset' => 15,
                 'mlt.fl' => 'description,name',
                 'mlt.mintf' => 1,
                 'mlt.mindf' => 3,