Added truncate param to grouping component

library/Solarium/Client/RequestBuilder/Select/Component/Grouping.php

@@ -65,6 +65,7 @@ class Solarium_Client_RequestBuilder_Select_Component_Grouping
         $request->addParam('group.main', $component->getMainResult());
         $request->addParam('group.ngroups', $component->getNumberOfGroups());
         $request->addParam('group.cache.percent', $component->getCachePercentage());
+        $request->addParam('group.truncate', $component->getTruncate());
 
         return $request;
     }

library/Solarium/Query/Select/Component/Grouping.php

@@ -382,4 +382,28 @@ class Solarium_Query_Select_Component_Grouping extends Solarium_Query_Select_Com
         return $this->getOption('cachepercentage');
     }
 
+    /**
+     * Set truncate option
+     *
+     * If true, facet counts are based on the most relevant document of each group matching the query.
+     * Same applies for StatsComponent. Default is false. Only available from Solr 3.4
+     *
+     * @param boolean $value
+     * @return Solarium_Query_Select_Component_Grouping Provides fluent interface
+     */
+    public function setTruncate($value)
+    {
+        return $this->_setOption('truncate', $value);
+    }
+
+    /**
+     * Get truncate option
+     *
+     * @return boolean|null
+     */
+    public function getTruncate()
+    {
+        return $this->getOption('truncate');
+    }
+
 }
\ No newline at end of file

tests/Solarium/Client/RequestBuilder/Select/Component/GroupingTest.php

@@ -46,6 +46,7 @@ class Solarium_Client_RequestBuilder_Select_Component_GroupingTest extends PHPUn
         $component->setMainResult(true);
         $component->setNumberOfGroups(false);
         $component->setCachePercentage(50);
+        $component->setTruncate(true);
 
         $request = $builder->build($component, $request);
 
@@ -60,6 +61,7 @@ class Solarium_Client_RequestBuilder_Select_Component_GroupingTest extends PHPUn
                 'group.main' => 'true',
                 'group.ngroups' => 'false',
                 'group.cache.percent' => 50,
+                'group.truncate' => 'true',
             ),
             $request->getParams()
         );

tests/Solarium/Query/Select/Component/GroupingTest.php

@@ -53,6 +53,7 @@ class Solarium_Query_Select_Component_GroupingTest extends PHPUnit_Framework_Tes
             'mainresult' => false,
             'numberofgroups' => true,
             'cachepercentage' => 45,
+            'truncate' => true,
         );
 
         $this->_grouping->setOptions($options);
@@ -65,6 +66,7 @@ class Solarium_Query_Select_Component_GroupingTest extends PHPUnit_Framework_Tes
         $this->assertEquals($options['mainresult'], $this->_grouping->getMainResult());
         $this->assertEquals($options['numberofgroups'], $this->_grouping->getNumberOfGroups());
         $this->assertEquals($options['cachepercentage'], $this->_grouping->getCachePercentage());
+        $this->assertEquals($options['truncate'], $this->_grouping->getTruncate());
     }
 
     public function testGetType()
@@ -196,4 +198,15 @@ class Solarium_Query_Select_Component_GroupingTest extends PHPUnit_Framework_Tes
         );
     }
 
+    public function testSetAndGetTruncate()
+    {
+        $value = true;
+        $this->_grouping->setTruncate($value);
+
+        $this->assertEquals(
+            $value,
+            $this->_grouping->getTruncate()
+        );
+    }
+
 }