Possible to iterate over one query set but show the other?

[creyD]

We have a config object in our code and a simple table for config aliases (alias + config). I want to create a generic API using ModelSerializers for listing the following for each ALIAS:

{
    "alias": "test",
    "config_param_1": 1,
    "config_param_2": True
}

How I imagined the serialiser to look like working with the standard ModelViewSet is like this:

class DeviceConfigSerializer(serializers.ModelSerializer):
    class Meta:
        model = Alias
        fields = [f.name for f in Config._meta.get_fields() if f.name not in ['id', 'other_fields']]

Then I would need to overwrite the method for getting the fields to take alias.conf fields. Trying a couple of ways (like below) I can't quite get it to work.

def to_representation(self, instance):
    if isinstance(instance, Config):
        return super().to_representation(instance.conf)
    return super().to_representation(instance)

Also tried overwriting many_init, with no success.

TL;DR: I want the ListSerializer to iterate over the ALIAS model but really show the details for the CONFIG model plus the alias.id.

[creyD]

This would easily work if I made the Serializer class the Config instead of the Alias. I always get a ImproperlyConfigured error message. Manually the following overwrite works:

def to_representation(self, instance):
        return {
            'id': instance.id,
            'config_param_1': instance.conf.config_param_1.name,
            'config_param_2': instance.conf.config_param_2
        }

[creyD]

Also I got it to work now by explicitly adding the fields like this: config_param_2 = serializers.CharField(source='conf.config_param_2')