Disconnect a linked object from a primary key using the Django REST Framework

Question

New to the Django REST Framework. Serialization continues. I do not understand how to deserialize a related object, given only its primary key from the database. Here is what I mean:

class ThingA(models.model):
    name = models.CharField(max_length=25)
    role = models.CharField(max_length=25, null=True, blank=True)

class ThingB(models.model):
    name = models.CharField(max_length=25)
    athing = models.ForeignKey(ThingA)

Suppose I have a POST /thingbREST call to create a new one ThingB, and the payload contains a name for the new one ThingBand idfor the associated one ThingA(which already exists in the database):

{
    "name": "Name for new ThingB",
    "athing" : 5
}

How do I write a Serializer DRF that can also deserialize this payload to end up ThingBwith whose attribute athingis an object ThingAwith id = 5? I tried using DRF ModelSerializers, so I got this far:

class ThingASerializer(serializers.ModelSerializer):

    class Meta:
        model = ThingA
        fields = ('id', 'name', 'role')

class ThingBSerializer(serializers.ModelSerializer):
    a_thingie = ThingASerializer(source='athing')

    class Meta:
        model = ThingB
        fields = ('id', 'name', 'a_thingie')

, , JSON . , ? , :

# THIS WON'T WORK
b = ThingBSerializer(data=request.DATA)

, , restore_object serializer, , restore_object . - ? !

Answer 1

PrimaryKeyRelatedField, , - , .

a_thingie, PrimaryKeyRelatedField to_native, , , .

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