Only show stack IDs for each account

server/server/api/serializers.py

@@ -20,7 +20,8 @@ class StackSerializer(serializers.ModelSerializer):
         fields = '__all__'
 
 class AccountSerializer(serializers.ModelSerializer):
-    stacks = StackSerializer(many=True, read_only=True)
+    stacks = serializers.PrimaryKeyRelatedField(many=True, read_only=True)
+    users = serializers.SlugRelatedField(many=True, read_only=True, slug_field='username')
 
     class Meta:
         model = models.Account