TandemPlugin: Improved matching query

git-svn-id: https://server2.data-quest.de/svn/studip-plugins/TandemPlugin@2454 6a1f69d7-6018-4d13-bf90-b098e98c258d

classes/TandemMatching.class.php

@@ -14,6 +14,8 @@
  **/
 
 
+require_once(__DIR__ . '/../models/TandemUserMotherLanguage.class.php');
+
 /**
  * This class implements the matching functionality.
  */
@@ -56,12 +58,25 @@ class TandemMatching
         }
                 
         $sql .= 'WHERE tuml.language_id = :target_language_id
-            AND tuml.user_id <> :user_id ';
+            AND tuml.user_id <> :user_id 
+            AND tandem_requests.target_language_id IN ( :request_user_mother_language_ids ) ';
+        
+        
+        $request_user_mother_language_ids = [];
+        $rumls = TandemUserMotherLanguage::findBySql(
+            'user_id = :user_id',
+            ['user_id' => $tandem_request->user_id]
+        );
+        
+        foreach($rumls as $ruml) {
+            $request_user_mother_language_ids[] = $ruml->language_id;
+        }
         
         
         $sql_params = [
             'target_language_id' => $tandem_request->target_language_id,
-            'user_id' => $tandem_request->user_id
+            'user_id' => $tandem_request->user_id,
+            'request_user_mother_language_ids' => $request_user_mother_language_ids
         ];
         
         if($request_gender) {
@@ -69,6 +84,8 @@ class TandemMatching
             $sql_params['request_gender'] = $request_gender;
         }
         
+        $sql .= ' GROUP BY tandem_requests.id, tandem_requests.user_id ';
+        
         
         if($limit > 0) {
             $sql .= 'LIMIT :limit';