fixed predavanja bug

portal/base.py

@@ -194,13 +194,11 @@ class UploadHandler:
         except Exception:
             traceback.print_exc()
 
-
-    @staticmethod
-    def check_suffixes(files):
+    def check_suffixes(self, files):
         for key, f in files.items():
             if key.startswith('file'):
                 suffix = f.filename.split('.')[-1]
-                if ENABLED_FILETYPES and suffix not in ENABLED_FILETYPES:
+                if self.ENABLED_FILETYPES and suffix not in self.ENABLED_FILETYPES:
                     return 'Datoteka "{}" ni pravilnega formata.'.format(f.filename)
         return None
 
@@ -220,7 +218,7 @@ class UploadHandler:
         elif len(files) < 1:
             return 'Priložena ni bila nobena datoteka.', 400
 
-        err = UploadHandler.check_suffixes(files)
+        err = self.check_suffixes(files)
         if err:
             return err, 400