diff --git a/group/serializers.py b/group/serializers.py
index 16909593..c38b30ff 100644
--- a/group/serializers.py
+++ b/group/serializers.py
@@ -31,12 +31,17 @@ class DeleteGroupSerializer(serializers.Serializer):
 
 class SimpleGroupSerializer(serializers.ModelSerializer):
     created_by = UsernameSerializer()
+    password = serializers.SerializerMethodField()
+    me = serializers.BooleanField()
+
+    def get_password(self, obj):
+        return obj.password != ""
 
     class Meta:
         model = Group
-        fields = ["id", "created_by", "name"]
+        fields = ["id", "created_by", "name", "password", "me"]
 
 
 class JoinGroupSerializer(serializers.Serializer):
     group_name = serializers.CharField()
-    password = serializers.CharField()
\ No newline at end of file
+    password = serializers.CharField(allow_blank=True)
\ No newline at end of file
diff --git a/group/views/oj.py b/group/views/oj.py
index d1485c66..09b3e7dd 100644
--- a/group/views/oj.py
+++ b/group/views/oj.py
@@ -5,7 +5,10 @@ from ..serializers import SimpleGroupSerializer, JoinGroupSerializer
 
 class GroupAPI(APIView):
     def get(self, request):
-        return self.success(SimpleGroupSerializer(Group.objects.filter(allow_join=True).order_by("-id"), many=True).data)
+        groups = Group.objects.filter(allow_join=True).order_by("-id")
+        for item in groups:
+            item.me = item.members.filter(username=request.user.username).exists()
+        return self.success(SimpleGroupSerializer(groups, many=True).data)
 
     @validate_serializer(JoinGroupSerializer)
     def post(self, request):
diff --git a/oj/settings.py b/oj/settings.py
index 79cd2646..732d26b1 100644
--- a/oj/settings.py
+++ b/oj/settings.py
@@ -180,7 +180,7 @@ REST_FRAMEWORK = {
     )
 }
 
-REDIS_URL = "redis://:foobar@%s:%s" % (REDIS_CONF["host"], REDIS_CONF["port"])
+REDIS_URL = "redis://@%s:%s" % (REDIS_CONF["host"], REDIS_CONF["port"])
 
 
 def redis_config(db):