correctly get request parsers with 'self'

zesje/resources/exams.py

@@ -62,7 +62,7 @@ class ExamConfig(Resource):
         yaml : str
             processed YAML config
         """
-        args = patch_parser.parse_args()
+        args = self.patch_parser.parse_args()
 
         exam = Exam.get(id=exam_id)
         if not exam:
@@ -128,7 +128,7 @@ class Exams(Resource):
             processed config
         """
 
-        args = post_parser.parse_args()
+        args = self.post_parser.parse_args()
 
         yml = yaml_helper.load(args['yaml'])
 

zesje/resources/graders.py

@@ -59,7 +59,7 @@ class Graders(Resource):
             first_name: str
             last_name: str
         """
-        args = post_parser.parse_args()
+        args = self.post_parser.parse_args()
         
         try:
             Grader(first_name= args['first_name'],