How to get 2 level nested related field in serializer?

[Jon Tart]

I have 3 models:

class City(models.Model):
    name = models.CharField()


class Place(models.Model):
    city = models.ForeignKey(City)


class Submission(models.Model):
    place = models.ForeignKey(Place)
    comment = models.CharField()

I have a serializer like this:

class SubmissionSerializer(serializers.ModelSerializer):
    class Meta:
        model = Submission
        fields = ('id', 'place__city_name', 'comment')
        read_only_fields = ('id', 'place__city_name')

But I'm getting ImproperlyConfigured exception:

Field name `place__city_name` is not valid for model `ModelBase`.

What am I doing wrong? I basically want to display city name of the submission which is behind 2 foreign keys. How can I achieve this?

Thanks in advance!

[Xavier Ordoquy]

Hi Jon,

You are looking for nested serializers.

The documentation has a few words about it there: http://www.django-rest-framework.org/api-guide/relations/#nested-relationships and within the 3.0 announcement you also have a section called "Writable nested serialization » (http://www.django-rest-framework.org/topics/3.0-announcement/).

Regards,

Xavier Ordoquy,

Linovia.