Fix FunstionScore Query random_score without seed bug

Author: krzaczek

changes.txt

@@ -1,5 +1,8 @@
 CHANGES
 
+2014-07-07
+ - Fix FunstionScore Query random_score without seed bug. #647
+
 2014-07-02
 - Add setPostFilter method to Elastica\Query (http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/_filtering_queries_and_aggregations.html#_post_filter) #645
 

lib/Elastica/Query/FunctionScore.php

@@ -171,9 +171,9 @@ public function setBoostMode($mode)
      */
     public function setRandomScore($seed = NULL)
     {
-        $seedParam = array();
+        $seedParam = new \stdClass();
         if (!is_null($seed)) {
-            $seedParam['seed'] = $seed;
+            $seedParam->seed = $seed;
         }
         return $this->setParam('random_score', $seedParam);
     }

test/lib/Elastica/Test/Query/FunctionScoreTest.php

@@ -170,6 +170,16 @@ public function testRandomScore()
         $this->assertEquals("Miller's Field", $result0['name']);
     }
 
+    public function testRandomScoreWithoutSeed()
+    {
+        $query = new FunctionScore();
+        $query->setRandomScore();
+
+        $response = $this->type->search($query);
+
+        $this->assertEquals(2, $response->count());
+    }
+
     public function testScriptScore()
     {
         $scriptString = "_score * doc['price'].value";