use Solr for random books

mobile.netbiblio.php

@@ -349,22 +349,20 @@ class NetBiblio extends WebService
         return $this->AddBookData($book);
     }
 
-    public function GetRandomBooks($number = 100) {
-        $sql = "SELECT TOP $number NoticeId
-                FROM Notices
-                WHERE
-                     (
-                        Notices.MediaType1Code='CDD' OR
-                        Notices.MediaType1Code='CDA' OR
-                        Notices.MediaType1Code='CDS'
-                    )
-                    AND Notices.Visible=1
-                    AND Notices.[NoticeNr] NOT LIKE '%%~%%'
-                ORDER BY NEWID();";
-        $ids = Connection::execute($sql)->to_array();
-        $ids = array_map(function($a) { return $a['NoticeId']; }, $ids);
-        $books = AudioBook::findBy('NoticeId', $ids, true);
-        return array_values($this->AddBookData($books));
+    public function GetRandomBooks($number = 100, $seed = null) {
+        if(is_null($seed)) {
+            $seed = time();
+        }
+
+        $bs = new BookSearch();
+        $bs->addSortField('random_'.$seed);
+        $results = $bs->getResults(0, $number);
+
+        if($results['response']['docs']) {
+            $books = array_map(function($o) { return (array) $o; }, $results['response']['docs']);
+            return $this->AddBookData($books);
+        }
+        return array();
     }
 
     public function Search($query, $start, $limit)