Django Rest Framework – Get related model field in serializer

Question

I’m trying to return a HttpResponse from Django Rest Framework including data from 2 linked models.
The models are:

class Wine(models.Model):

    color = models.CharField(max_length=100, blank=True)
    country = models.CharField(max_length=100, blank=True)
    region = models.CharField(max_length=100, blank=True)
    appellation = models.CharField(max_length=100, blank=True)

class Bottle(models.Model):

    wine = models.ForeignKey(Wine, null=False)
    user = models.ForeignKey(User, null=False, related_name='bottles')

I’d like to have a serializer for the Bottle model which includes information from the related Wine.

I tried:

class BottleSerializer(serializers.HyperlinkedModelSerializer):
    wine = serializers.RelatedField(source='wine')

    class Meta:
        model = Bottle
        fields = ('url', 'wine.color', 'wine.country', 'user', 'date_rated', 'rating', 'comment', 'get_more')

which doesn’t work.

Any ideas how I could do that?

Thanks 🙂

Asked By: bpipat

||

Source

Answer 1

Simple as that, adding the WineSerializer as a field solved it.

class BottleSerializer(serializers.HyperlinkedModelSerializer):
    wine = WineSerializer(source='wine')

    class Meta:
        model = Bottle
        fields = ('url', 'wine', 'user', 'date_rated', 'rating', 'comment', 'get_more')

with:

class WineSerializer(serializers.HyperlinkedModelSerializer):

    class Meta:
        model = Wine
        fields = ('id', 'url', 'color', 'country', 'region', 'appellation')

Thanks for the help @mariodev 🙂

Answered By: bpipat

Answer 2

If you want to get specific field you can use Serializer Fields

https://www.django-rest-framework.org/api-guide/fields/

    class BottleSerializer(serializers.HyperlinkedModelSerializer):
        winecolor = serializers.CharField(read_only=True, source="wine.color")

        class Meta:
            model = Bottle
            fields = ('url', 'winecolor', 'user', 'date_rated', 'rating', 'comment', 'get_more')

Answered By: Ryan Jeric

Django Rest Framework – Get related model field in serializer

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