Select the database to be serialized in nesting

[cn-kali-team]

class UserSerializer(serializers.Serializer):
    email = serializers.EmailField()
    username = serializers.CharField(max_length=100)

class CommentSerializer(serializers.Serializer):
    user = UserSerializer()
    content = serializers.CharField(max_length=200)
    created = serializers.DateTimeField()

Is there any way to choose which database to use before serialization? My program is very complicated. How to set up the database of UserSerializer in nested serialization? I know that the database of CommentSerializer can be set up using get_queryset, but I can't set UserSerializer

• Can I choose a database in this way

class UserSerializer(serializers.Serializer):
    email = serializers.EmailField()
    username = serializers.CharField(max_length=100)
    class Meta:
        model = User
        using = 'user_db'
class CommentSerializer(serializers.Serializer):
    user = UserSerializer()
    content = serializers.CharField(max_length=200)
    created = serializers.DateTimeField()
    class Meta:
        model = Comment
        using = 'comment_db'