I'm trying to send an extra array with a POST
request that creates a group.
POST /groups/
{
"name": “New Group“,
"users_to_invite": [ 1, 2, 6 ]
}
I'm using Django Rest Framework
's ListCreateAPIView
to handle the request:
class GroupListView(ListCreateAPIView):
queryset = Group.objects.all()
def get_serializer(self, *args, **kwargs):
kwargs['context'] = self.get_serializer_context()
# Use a dedicated serializer to inspect the field with users to invite
if self.request.method == 'POST':
return GroupCreateSerializer(*args, **kwargs)
return GroupSerializer(*args, **kwargs)
I want to get to the contents of the users_to_invite
array in a serializer to create invitation objects. However, I'm unable to do so because somehow the array is not there when I'm accessing it in the serializer.
class GroupCreateSerializer(ModelSerializer):
def create(self, validated_data):
# Get user ids to invite
# !! It fails here !!
invitations_data = validated_data.pop('users_to_invite')
# TODO: Iterate over ids and create invitations
# Create a group
group = Group.objects.create(**validated_data)
return group
class Meta:
model = Group
fields = ('id', 'name', )
Array is not there so naturally I'm getting the error:
File "...my_api/serializers.py", line 303, in create
invitations_data = validated_data.pop('users_to_invite')
KeyError: 'users_to_invite'
How can I make the array to appear there? Modifying the model does not sound like a good idea because I don't want to store what's in the array.
extra data is absent in validated_data
you can try use self.context['request']
details: including-extra-context , by default it added in the get_serializer method of view
for your case:
def create(self, validated_data):
# Get user ids to invite
# !! It fails here !!
request = self.context['request']
invitations_data = request.data.get('users_to_invite')
To send extra context data you should pass it from the method def get_serializer_context(self)
and access inside serializer like self.context.get("key")
.
sample code:
class GroupListView(ListCreateAPIView):
queryset = Group.objects.all()
def get_serializer_context(self):
context = super(GroupListView, self).get_serializer_context()
context["users_to_invite"] = request.data.get("users_to_invite")
return context
class GroupCreateSerializer(ModelSerializer):
def create(self, validated_data):
users_to_invite = self.context.get("users_to_invite")
# do whatever you want
Apart from adding the data to context, you can add the field users_to_invite
to serializer as a CharField
.
Example :
import json
class GroupCreateSerializer(ModelSerializer):
def create(self, validated_data):
# Get user ids to invite
# !! It fails here !!
invitations_data = json.loads(validated_data.pop('users_to_invite'))
# TODO: Iterate over ids and create invitations
# Create a group
group = Group.objects.create(**validated_data)
return group
users_to_invite = serializers.CharField(required=False)
class Meta:
model = Group
fields = ('id', 'name', 'users_to_invite', )
Note: Make sure to have users_to_invite
in request data as a string. Like: '[1, 2, 3]'
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