Django Rest Framework can't identify serializer field name - django

Question

This is the problem: I have a serializer field pointing to another serializer. I sending an allright request to server and I get this response:
{
"purchase_header": [
"This field is required."
]
}
But the field was sended by POST request (in debugger I can see it).
I finded this code in html.py (from DRF):
def parse_html_dict(dictionary, prefix=''):
"""
Used to support dictionary values in HTML forms.
{
'profile.username': 'example',
'profile.email': 'example#example.com',
}
-->
{
'profile': {
'username': 'example',
'email': 'example#example.com'
}
}
"""
ret = MultiValueDict()
regex = re.compile(r'^%s\.(.+)$' % re.escape(prefix))
for field in dictionary:
match = regex.match(field)
if not match:
continue
key = match.groups()[0]
value = dictionary.getlist(field)
ret.setlist(key, value)
return ret
Well, when debuging I can see that prefix variable contain "purchase_header" and field variable contain the same "purchase_header" string but de match fail returning None. Very rare... dictionary parameter contain all keys and values.
But If you can helpme I appreciate much.
This is the rest of significant code:
urls.py
router = DefaultRouter()
router.register(r'cancel-requests', PurchaseCancellationsRequestViewSet,
basename='purchase-cancel-requests')
router.register(r'invoices', PurchaseViewSet, basename='purchase')
urlpatterns = router.urls
urlpatterns += [path('payment-headers/', PaymentHeadersListAPIView.as_view(
), name='PaymentHeadersListAPIView')]
api.py
class PurchaseViewSet(viewsets.ModelViewSet):
"""
A viewset for viewing and editing purchases instances.
"""
serializer_class = PurchaseSerializer
queryset = Purchase.objects.all().order_by('-created_at')
permission_classes = (IsAuthenticated,)
serializer_action_classes = {
'list': PurchaseSerializer,
'create': PurchaseSerializer,
'retrieve': PurchaseSerializer,
'update': PurchaseSerializer,
'partial_update': PurchaseSerializer,
'destroy': PurchaseSerializer
}
def get_serializer_class(self):
try:
return self.serializer_action_classes[self.action]
except (KeyError, AttributeError):
return super().get_serializer_class()
def get_serializer(self, *args, **kwargs):
serializer_class = self.get_serializer_class()
kwargs["context"] = self.get_serializer_context()
return serializer_class(*args, **kwargs)
def get_list_queryset(self):
try:
store = Store.objects.get(my_owner=self.request.user)
except EmptyResultSet as e:
print("Data Error: {0}".format(e))
urlquery = self.request.GET.get('cancelled', '')
cancelled = False
if urlquery == 'true':
cancelled = True
elif urlquery == '':
# return all
return Purchase.objects.filter(created_for=store)
return Purchase.objects.filter(cancelled=cancelled, created_for=store)
def put(self, request, *args, **kwargs):
if request.user.is_seller:
raise PermissionDenied(
detail='Only owners can cancellate Purchases')
# seller create invoice cancellation request
return self.update(request, *args, **kwargs)
def post(self, request, *args, **kwargs):
request.data['created_by'] = request.user.pk
print(request.data)
if request.user.is_owner is True:
try:
request.data['created_for'] = Store.objects.get(
my_owner=request.user).pk
except Exception as e:
print(e)
return Response(data='User has no Store associated',
status=status.HTTP_400_BAD_REQUEST)
else:
try:
request.data['created_for'] = request.user.seller_profile \
.my_store.pk
except Exception as e:
print(e)
return Response(data='User has no Store associated',
status=status.HTTP_400_BAD_REQUEST)
return self.create(request, *args, **kwargs)
def list(self, request, *args, **kwargs):
# TODO: date ranges
if self.request.user.is_seller:
# TODO: Change -> Indeed the seller can get his own created
# purchases and refactor this to method
raise PermissionDenied(
detail='Only owners can get purchase list.')
queryset = self.get_list_queryset()
page = self.paginate_queryset(queryset)
if page is not None:
serializer = self.get_serializer(page, many=True)
return self.get_paginated_response(serializer.data)
serializer = self.get_serializer(queryset, many=True)
return Response(serializer.data)
serializers.py
from rest_framework import serializers
from .models import Purchase, PurchaseCancellationRequest, PurchaseHeader
class PurchaseHeaderSerializer(serializers.ModelSerializer):
class Meta:
model = PurchaseHeader
fields = ['id', 'name']
extra = {
'id': {'read_only': True},
'name': {'read_only': True}
}
class PurchaseSerializer(serializers.ModelSerializer):
purchase_header = PurchaseHeaderSerializer()
class Meta:
model = Purchase
fields = ['id', 'cancelled', 'created_at', 'created_by',
'created_for', 'pic', 'total_amount', 'purchase_header']
extra = {
'cancelled': {'read_only': True},
'created_at': {'read_only': True},
'id': {'read_only': True}
}
def validate_total_amount(self, value):
"""
Sanitize the amount value.
:return: total_amount as float
"""
total_amount = None
try:
total_amount = float(value)
except Exception as e:
print(e)
if total_amount:
return value
else:
raise serializers.ValidationError('Exists an error with '
'total_amount value, probably '
'an empty param or bad float '
'format')
def validate_cancelled(self, value):
"""
Sanitize the cancelled value.
:return: cancelled as python boolean
"""
cancelled = None
try:
cancelled = False if value == 'false' else True
except Exception as e:
print(e)
if cancelled:
return value
else:
raise serializers.ValidationError('Exists an error with '
'cancelled value, probably an '
'empty param or bad boolean '
'value')
def create(self, validated_data):
payment_header_pk = validated_data.pop('purchase_header')
payment_header_obj = PaymentHeader.objects.get(pk=payment_header_pk)
purchase_obj = Purchase.objects.create(
payment_header=payment_header_obj, **validated_data)
return purchase_obj
class PurchaseCancellationRequestSerializer(serializers.ModelSerializer):
class Meta:
model = PurchaseCancellationRequest
fields = ['purchase']
models.py
class PurchaseHeader(SoftDeleteModel):
name = models.CharField(max_length=50)
city = models.ManyToManyField(City, through='purchases.ProviderCity')
created_at = models.DateTimeField(default=timezone.now(), editable=False)
modified_at = models.DateTimeField(default=timezone.now())
class ProviderCity(SoftDeleteModel):
city = models.ForeignKey(City, on_delete=models.PROTECT)
purchase_header = models.ForeignKey(PurchaseHeader,
on_delete=models.PROTECT)
class Meta:
unique_together = ('city', 'purchase_header')
Thank for all friends!!