diff --git a/stude/studygroup_messages/serializers.py b/stude/studygroup_messages/serializers.py
index 5222e89..89b11da 100644
--- a/stude/studygroup_messages/serializers.py
+++ b/stude/studygroup_messages/serializers.py
@@ -1,13 +1,14 @@
 from rest_framework import serializers
 from .models import Message
 from accounts.models import CustomUser
+from study_groups.models import StudyGroup
 
 
 class MessageSerializer(serializers.ModelSerializer):
     user = serializers.SlugRelatedField(
-        queryset=CustomUser.objects.all(), slug_field='full_name', required=False)
-    study_group = serializers.CharField(
-        source='subject.Subject', read_only=True, required=False)
+        queryset=CustomUser.objects.all(), slug_field='full_name', required=True)
+    study_group = serializers.SlugRelatedField(
+        queryset=StudyGroup.objects.all(), slug_field='name', required=True)
 
     class Meta:
         model = Message