Hello everybody,
I am struggling getting the following to work. I have a model with a
ManyToMany realationship and I want it to be updateable through the Web API
of the DjangoRestFramework.
class Topping(models.Model):
name = models.CharField(max_length=255)
class Pizza(models.Model):
name = models.CharField(max_length=255)
creator = models.ForeignKey(User)
toppings = ManyToManyField(Topping, related_name='pizzas', blank=True)
My Pizza serializer looks like this:
class PizzaSerializer(ExpanderSerializerMixin,
serializers.HyperlinkedModelSerializer):
id = serializers.IntegerField(read_only=True)
topping_queryset = models.Topping.objects.all()
toppings =
serializers.HyperlinkedRelatedField(queryset=topping_queryset,
view_name='topping-detail', style={'base_template': 'input.html'},
many=True)
"""
Create and return a new `Pizza` instance
"""
def create(self, validated_data):
return models.Pizza.objects.create(**validated_data,
creator=self.context['request'].user)
class Meta:
model = models.Pizza
fields = '__all__'
read_only_fields = ('creator',)
expandable_fields = {
'creator': UserSerializer,
'toppings': (ToppingSerializer, (), {'many': True},),
}
Displaying the pizzas and their toppings works fine but when I e.g. want to
update an existing pizza the toppings field in the browser is displayed
like this:
['http://localhost:8000/api/v2/toppings/3/',
'http://localhost:8000/api/v2/toppings/2/']
Which in my opinion looks fine. But it ends up with the error message
""Invalid hyperlink - No URL match."" when I send a PUT request.
The reason seems to be that the input is not properly parsed into a list of
two elements but it ends up being a list with a single item which is the
string from above ["[\'http://localhost:8000/api/v2/toppings/3/\',
\'http://localhost:8000/api/v2/toppings/2/\']"]
It seems that the request parsing happens in django/http/requests.py and it
would expect multiple toppings entries instead of a single one as list.
What would I need to change so that the list is properly parsed?
The versions i am currently running are:
Django==1.11.29
djangorestframework==3.11.0
djangorestframework-expander==0.2.3
Thanks a million, I am really stuck by now.
Fabian
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