How to get m2m field in validated_data? - django

Question

I've a model:
class ListingPrice(Timestamps):
price = models.ForeignKey("Price", on_delete=models.CASCADE)
location = models.ForeignKey("location", on_delete=models.CASCADE)
class Meta:
unique_together = ["price", "location"]
class Price(Timestamps):
package = models.ForeignKey("products.Package", on_delete=models.CASCADE)
locations = models.ManyToManyField("location", through="ListingPrice")
price = models.DecimalField(max_digits=11, decimal_places=3)
with a serializer:
class LocationSerializer(serializers.ModelSerializer):
name = LocalizedField()
class Meta:
model = location
fields = ['id', 'name']
class PriceSerializer(serializers.ModelSerializer):
locations = LocationSerializer(many=True, read_only=True)
class Meta:
model = Price
fields = ['package', 'locations', 'price']
def create(self, validated_data):
print("validated_data, validated_data)
and viewset:
class PriceViewSet(ModelViewSet):
queryset = Price.objects.all()
serializer_class = PriceSerializer
ordering = ['id']
permissions = {
"GET": ["view_minimum_listing_price", ],
"POST": ["add_minimum_listing_price", ],
'PUT': ['update_minimum_listing_price', ],
'DELETE': ['delete_minimum_listing_price', ],
}
In testing I'mm using the following:
data = {
"price": 12,
"package": self.package.id,
"is_enabled": False,
"location": self.location
}
response = self.client.post(path=self.url, data=data, format='json')
locations doesn't appear in validated_data?
How to get it to assign locations to the instance with post requests?
I also tried to send it with as ids list, but non works. I only field price, package, is_enabled in validated}_data, but location doesn't appear!

Answer 1

read_only=True means the field will be neglected in request body and will only appear in response body
locations = LocationSerializer(many=True, read_only=True)
so, remove it and you can access locations in validated_data