Implementing a create function for a Serializer class containing foreignkey

Question

So, this is how i have implemented the class:

class VenueSerializer(serializers.ModelSerializer):
    city = serializers.StringRelatedField(many=True)
    class Meta:
        model = Venue
        fields = '__all__'

    def create(self, validated_data):
        venue = Team(
            name=validated_data['name']
            #I know this is wrong but i just wanted to demonstrate what is it that i need to get done
            #city is the foreign key referencing to the model City
            city=validated_data['city']
        )
        venue.save()
        return venue

So i have a model for venues, and each venue has to be associated with the model city. I am new to the REST Framework and i can't figure out a way to create an instance of the venue model while setting the value of the city field. Can someone please help me with this?

Than you

Can you share your models and request data?

Brian Destura
– Brian Destura

2021-08-22 06:12:44 +00:00
Commented Aug 22, 2021 at 6:12 — Brian Destura
– Brian Destura, Commented Aug 22, 2021 at 6:12

Brian Destura · Accepted Answer · 2021-08-22 06:17:33Z

3

You can use a PrimaryKeyRelatedField, to add a foreign key relation to the object you are creating:

class VenueSerializer(serializers.ModelSerializer):
    city = serializers.PrimaryKeyRelatedField(queryset=City.objects.all())
    class Meta:
        model = Venue
        fields = '__all__'

You can pass a request data like this:

{
    "name": "MyVenue",
    ... (other venue related data)...,
    "city": 1,
}

where city is a valid foreign key to a City object. This will automatically set the foreign key to the venue object for you, and you don't even need to override create to handle it.

answered Aug 22, 2021 at 6:17

Brian Destura

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