training/presence visibility by coach

_class/class_training.php

@@ -135,6 +135,11 @@ class training {
         return !empty($this->tr_coaches);
     }
 
+    public static function has_any_coach($training_id) {
+        global $sql;
+        return $sql->num_of_rows("SELECT * FROM training_coach WHERE trc_training_tr_id = " . $training_id);
+    }
+
     public function is_helper() {
         //megadja, hogy van-e beállítva segédedző az edzéshez
         //TRUE HA IGEN, FALSE EGYÉBKÉNT