Wsrtjtyk

Currently I am setting up the backend (using MongoDB, djongo and pymongo) of a site on which you have to register and then enter personal information before accessing a dashboard, in short.

The fact is that the register system works flawlessly thanks to Djoser and I also added a signal to create my own user instance with the new User created instance.
It is then my own MyUser model thus created that I PATCH with another route, and that too seems to work perfectly.

The problem is that, on my admin site, when I try to delete the User model, I get such an error:

Traceback (most recent call last):

  File "/Users/quentinmoinat/PycharmProjects/dimtech_backend/venv/lib/python3.6/site-packages/djongo/sql2mongo/query.py", line 763, in parse

    return handler(self, statement)

  File "/Users/quentinmoinat/PycharmProjects/dimtech_backend/venv/lib/python3.6/site-packages/djongo/sql2mongo/query.py", line 881, in _update

    self._query = UpdateQuery(self.db, self.connection_properties, sm, self._params)

  File "/Users/quentinmoinat/PycharmProjects/dimtech_backend/venv/lib/python3.6/site-packages/djongo/sql2mongo/query.py", line 312, in __init__

    super().__init__(*args)

  File "/Users/quentinmoinat/PycharmProjects/dimtech_backend/venv/lib/python3.6/site-packages/djongo/sql2mongo/query.py", line 74, in __init__

    self.parse()

  File "/Users/quentinmoinat/PycharmProjects/dimtech_backend/venv/lib/python3.6/site-packages/djongo/sql2mongo/query.py", line 343, in parse

    self.result = db[self.left_table].update_many(**kwargs)

  File "/Users/quentinmoinat/PycharmProjects/dimtech_backend/venv/lib/python3.6/site-packages/pymongo/collection.py", line 1065, in update_many

    session=session),

  File "/Users/quentinmoinat/PycharmProjects/dimtech_backend/venv/lib/python3.6/site-packages/pymongo/collection.py", line 851, in _update_retryable

    _update, session)

  File "/Users/quentinmoinat/PycharmProjects/dimtech_backend/venv/lib/python3.6/site-packages/pymongo/mongo_client.py", line 1248, in _retryable_write

    return self._retry_with_session(retryable, func, s, None)

  File "/Users/quentinmoinat/PycharmProjects/dimtech_backend/venv/lib/python3.6/site-packages/pymongo/mongo_client.py", line 1201, in _retry_with_session

    return func(session, sock_info, retryable)

  File "/Users/quentinmoinat/PycharmProjects/dimtech_backend/venv/lib/python3.6/site-packages/pymongo/collection.py", line 847, in _update

    retryable_write=retryable_write)

  File "/Users/quentinmoinat/PycharmProjects/dimtech_backend/venv/lib/python3.6/site-packages/pymongo/collection.py", line 818, in _update

    _check_write_command_response(result)

  File "/Users/quentinmoinat/PycharmProjects/dimtech_backend/venv/lib/python3.6/site-packages/pymongo/helpers.py", line 217, in _check_write_command_response

    _raise_last_write_error(write_errors)

  File "/Users/quentinmoinat/PycharmProjects/dimtech_backend/venv/lib/python3.6/site-packages/pymongo/helpers.py", line 198, in _raise_last_write_error

    raise DuplicateKeyError(error.get("errmsg"), 11000, error)

pymongo.errors.DuplicateKeyError: E11000 duplicate key error collection: dimtech.API_myuser index: user_id_1 dup key: { : null }

Here's my code:

from jsonfield import JSONField



from django.db import models

from django.db.models.signals import post_save

from django.dispatch import receiver

from django.contrib.auth.models import User

from rest_framework import serializers

from rest_framework import viewsets

from rest_framework.generics import RetrieveUpdateAPIView



class MyUser(models.Model):

    user = models.OneToOneField(User, on_delete=models.CASCADE, null=True)



    myuser_phone_number = models.CharField(max_length=15, null=True)

    myuser_job = models.CharField(max_length=64, null=True)

    myuser_nationality = models.CharField(max_length=64, null=True)

    myuser_avatar = models.ImageField(upload_to="photos/users/Clients", null=True)

    myuser_birthdate = models.DateField(null=True)

    myuser_first_sign_in = models.BooleanField(default=True)

    myuser_data = JSONField(null=True)



    myuser_markets = models.ManyToManyField('Market', related_name='market_followers')



class MyUserSerializer(serializers.ModelSerializer):



    username = serializers.CharField(read_only=True, source="user.username")

    first_name = serializers.CharField(read_only=True, source="user.first_name")

    last_name = serializers.CharField(read_only=True, source="user.last_name")

    email = serializers.CharField(read_only=True, source="user.email")

    is_active = serializers.BooleanField(read_only=True, source="user.is_active")



    class Meta:

        model = MyUser

        fields = ('id', 'username', 'first_name', 'last_name', 'email', 'is_active', 'myuser_phone_number',

                  'myuser_birthdate', 'myuser_avatar', 'myuser_nationality', 'myuser_job', 'myuser_first_sign_in',

                  'myuser_data')





class MyUserViewSet(viewsets.ModelViewSet):

    queryset = MyUser.objects.all()

    serializer_class = MyUserSerializer



class CurrentMyUser(RetrieveUpdateAPIView):

    serializer_class = MyUserSerializer



    def get_object(self):

        queryset = MyUser.objects.get(user=self.request.user)

        return queryset



    def perform_update(self, serializer):

        myuser = serializer.save()

        # add data on meta class User

        user = myuser.user

        if 'username' in self.request.data:

            user.username = self.request.data['username']

        if 'email' in self.request.data:

            user.email = self.request.data['email']

        if 'first_name' in self.request.data:

            user.first_name = self.request.data['first_name']

        if 'last_name' in self.request.data:

            user.last_name = self.request.data['last_name']

        user.save()



        # myuser first sign in

        if myuser.myuser_first_sign_in:

            if self.request.data.get('last_name',  False) is not False and 

                    self.request.data.get('first_name',  False) is not False and 

                    self.request.data.get('myuser_nationality',  False) is not False and 

                    self.request.data.get('myuser_birthdate',  False) is not False and 

                    self.request.data.get('email',  False) is not False:

                myuser.myuser_first_sign_in = False

        myuser.save()



@receiver(post_save, sender=User)

def registration(sender, instance, created, **kwargs):

    if created:

        MyUser.objects.create(user=instance)

Thank you in advance for your help and advice,

Tintin