Use native FileField

competition/models.py

@@ -368,10 +368,14 @@ class Meta:
         Series, verbose_name='úloha zaradená do série',
         related_name='problems',
         on_delete=models.CASCADE,)
-    image = RestrictedFileField(
-        content_types=['image/svg+xml', 'image/png'],
+
+    image = models.ImageField(
         upload_to='problem_images/',
-        verbose_name='Obrázok k úlohe', null=True, blank=True)
+        verbose_name='Obrázok k úlohe',
+        null=True,
+        blank=True,
+    )
+
     solution_pdf = RestrictedFileField(
         content_types=['application/pdf'],
         verbose_name='Vzorové riešenie', null=True, blank=True,

competition/serializers.py

@@ -171,29 +171,6 @@ def submitted_solution(self, obj):
             return SolutionSerializer(solution).data
         return None
 
-    def update_image(self, problem: Problem):
-        request: Request = self.context.get('request')
-        if request:
-            if len(request.FILES) > 1:
-                raise ValueError('Úloha môže obsahovať iba 1 obrázok')
-            if len(request.FILES) == 1:
-                for name, file in request.FILES.items():
-                    if '.' not in name:
-                        raise ValueError('Nepodarilo sa zistiť formát súboru')
-                    extension = name.split('.')[-1]
-                    problem.image.save(
-                        f'problem_image_{problem.pk}.{extension}', file)
-
-    def create(self, validated_data):
-        problem: Problem = super().create(validated_data)
-        self.update_image(problem)
-        return problem
-
-    def update(self, instance: Problem, validated_data):
-        problem = super().update(instance, validated_data)
-        self.update_image(problem)
-        return problem
-
 
 @ts_interface(context='competition')
 class CommentSerializer(serializers.ModelSerializer):