Django Add PrimaryKeyRelatedField List - django

Question

I have two classes
class Drink(models.Model):
name = models.CharField(max_length=100, blank=False, default='')
brand = models.TextField()
percentage = models.IntegerField()
class Drinking(models.Model):
amount = models.IntegerField(blank=False)
drinks = models.ForeignKey(Drink, related_name='drinks',blank = True,null=True)
and want to add a list of drinks to the Drinking model via a REST POST.
In the serializer I have the following:
class DrinkingSerializer(serializers.ModelSerializer):
drinks = serializers.PrimaryKeyRelatedField(many=True, read_only=False ,queryset=Drink.objects.all())
class Meta:
model = Drinking
fields = ('pk','drinks','amount')
def create(self, validated_data):
return Drinking.objects.create(**validated_data)
def update(self, instance, validated_data):
instance.amount = validated_data.get('amount', instance.amount)
instance.save()
return instance
When I try to POST an Drinking Object:
{
"drinks": [2],
"amount": 5
}
I get the Error, that Drinkings.drinks must be Drink instance. My guess is that I have to change the queryset to only get the primary key of the drinks but I don't know how.
UPDATE
I did a small change in the logic, so every Drinking class can only have one Drink and one amount. This works now with the following Serializer:
class DrinkingSerializer(serializers.ModelSerializer):
drink = serializers.PrimaryKeyRelatedField(many=False, read_only=False, queryset=Drink.objects.all())

Answer 1

Are you sure that Drink object with id 2 exists?
Also, try making request without brackets: "drinks": 2 - in my DRF Api nothing else is needed.

Answer 2

I think the field drinks in your Drinking model should be in the Drink model.
class Drinking(models.Model):
amount = models.IntegerField(blank=False)
class Drink(models.Model):
name = models.CharField(max_length=100, blank=False, default='')
brand = models.TextField()
percentage = models.IntegerField()
drinks = models.ForeignKey(Drinking, related_name='drinks',blank = True,null=True)
Then, using these models your serializer should look like this:
class DrinkingSerializer(serializers.ModelSerializer):
drinks = serializers.PrimaryKeyRelatedField(many=True, read_only=False ,queryset=Drink.objects.all())
class Meta:
model = Drinking
fields = ('pk','drinks','amount')
I hope this helps.