feat(websocket): frontend websocket

polylan_submitter/submissions/apps.py

@@ -1,4 +1,17 @@
 from django.apps import AppConfig
+from django.core.serializers.json import DjangoJSONEncoder
+
+from channels_redis.serializers import JSONSerializer, registry
+
+import json
+
+
+class CJSONSerializer(JSONSerializer):
+    """Override `JSONSerializer` to use `DjangoJSONEncoder`."""
+
+    def as_bytes(self, message, *args, **kwargs):  # noqa: ANN001 ANN002 ANN003 ANN201
+        message = json.dumps(message, *args, **kwargs, cls=DjangoJSONEncoder)
+        return message.encode("utf-8")
 
 
 class SubmissionsConfig(AppConfig):
@@ -6,4 +19,6 @@ class SubmissionsConfig(AppConfig):
     name = "submissions"
 
     def ready(self):
+        registry.register_serializer("cjson", CJSONSerializer)
+
         import submissions.signals  # noqa