Как исправить 'User' object is not iterable в Django?

Question

[nnn Xion]

Хочу добавить подписчиков своему пользователю

Модель пользователя

from email.policy import default
from random import choices

from django.contrib.auth.models import AbstractUser
from django.db import models


class UserSonet(AbstractUser):
    """User model for sonet"""

    GENDER = (
        ("male", "male"),
        ("female", "female"),
        ("other", "other"),
    )

    first_login = models.DateTimeField(blank=True, null=True)
    birthday = models.DateField(blank=True, null=True)
    gender = models.CharField(max_length=7, choices=GENDER, default="Unknown")

    phone = models.CharField(max_length=14)
    biography = models.TextField(max_length=500, blank=True, null=True)

    github = models.CharField(max_length=500, blank=True, null=True)
    linkedin = models.CharField(max_length=500, blank=True, null=True)

    work_place = models.CharField(max_length=150, blank=True, null=True)
    work_position = models.CharField(max_length=150, blank=True, null=True)

    technology = models.ManyToManyField('Technology', related_name='users')

    avatar = models.ImageField(upload_to='user/avatar/', blank=True, null=True)

так же сериализаторы пользователя

from .models import UserSonet

from rest_framework import serializers


class GetUserSonetSerializer(serializers.ModelSerializer):
    """
    Filtered display user information
    """
    avatar = serializers.ImageField(write_only=True)
    class Meta:
        model = UserSonet
        exclude = (
            'password',
            'first_login',
            'is_active',
            'is_staff',
            'is_superuser',
            'groups',
            'user_permissions')


class GetUserSonetPublicSerializer(serializers.ModelSerializer):
    """
    Filtered display user information for public
    """
    class Meta:
        model = UserSonet
        exclude = (
            'email',
            'phone',
            'password',
            'first_login',
            'is_active',
            'is_staff',
            'is_superuser',
            'groups',
            'user_permissions')


class UserFollowerSerializer(serializers.ModelSerializer):
    """Serializer for Follower"""

    avatar = serializers.ImageField(read_only=True)
    class Meta:
        model = UserSonet
        fields = ('id', 'username', 'avatar')

а теперь к приложению фолловеров

его модель

from django.db import models
from django.conf import settings


class Follower(models.Model):
    """Follower model"""

    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE,
                            related_name='owner')
    subscriber = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE,
                            related_name='subscribers')

сериализатор

from rest_framework import serializers
from .models import Follower
from src.profiles.serializers import UserFollowerSerializer


class ListFollowerSerializer(serializers.ModelSerializer):
    """List of Follower"""

    subscriber = UserFollowerSerializer(many=True, read_only=True)
    class Meta:
        model = Follower
        fields = ('subscriber', )

вьюха

from rest_framework import generics, permissions, views, response
from .models import Follower
from .serializers import ListFollowerSerializer

from src.profiles.models import UserSonet

class ListFollowerView(generics.ListAPIView):
    """Display a list of user Follower"""

    permission_classes = [permissions.IsAuthenticated]
    serializer_class=ListFollowerSerializer
    
    def get_queryset(self):
        return Follower.objects.filter(user=self.request.user)


class AddFollowerView(views.APIView):
    """Add a new Follower"""

    permission_classes = [permissions.IsAuthenticated]

    def post(self, request, pk):
        try:
            user = UserSonet.objects.get(id=pk)
        except Follower.DoesNotExist:
            return response.Response(status=404)
        Follower.objects.create(subscriber=request.user, user=user)
        return response.Response(status=201)

    def delete(self, request, pk):
        try:
            subcriber = Follower.objects.get(subscriber=request.user, user_id=pk)
        except Follower.DoesNotExist:
            return response.Response(status=404)
        subcriber.delete()
        return response.Response(status=204)

Через админку создать фолловеров могу, но если в постмене отправляю запрос на то чтобы вывести фолловеров пользователя вылетает такая ошибка:

Internal Server Error: /api/v1/follower/
Traceback (most recent call last):
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/django/core/handlers/exception.py", line 55, in inner
response = get_response(request)
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/django/core/handlers/base.py", line 197, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
return view_func(*args, **kwargs)
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/django/views/generic/base.py", line 103, in view
return self.dispatch(request, *args, **kwargs)
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/rest_framework/views.py", line 509, in dispatch
response = self.handle_exception(exc)
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/rest_framework/views.py", line 469, in handle_exception
self.raise_uncaught_exception(exc)
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
raise exc
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/rest_framework/views.py", line 506, in dispatch
response = handler(request, *args, **kwargs)
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/rest_framework/generics.py", line 199, in get
return self.list(request, *args, **kwargs)
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/rest_framework/mixins.py", line 46, in list
return Response(serializer.data)
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/rest_framework/serializers.py", line 768, in data
ret = super().data
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/rest_framework/serializers.py", line 253, in data
self._data = self.to_representation(self.instance)
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/rest_framework/serializers.py", line 686, in to_representation
return [
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/rest_framework/serializers.py", line 687, in
self.child.to_representation(item) for item in iterable
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/rest_framework/serializers.py", line 522, in to_representation
ret[field.field_name] = field.to_representation(attribute)
File "/Users/comp/Desktop/Python-Proj/My/social_network-django/venv/lib/python3.9/site-packages/rest_framework/serializers.py", line 686, in to_representation
return [
TypeError: 'UserSonet' object is not iterable
[07/Jan/2023 22:12:03] "GET /api/v1/follower/ HTTP/1.1" 500 124758

Думаю, что ошибка где-то в сериализаторах, так как если в админка к сериализаторам отношения не имеет и в ней все ок.

Answer 1

[nnn Xion]

Восхищаюсь собой. Всё починил.

в сериализаторе фолловеров

class ListFollowerSerializer(serializers.ModelSerializer):
    """List of Follower"""

    subscriber = UserFollowerSerializer(many=False, read_only=True) # было many=True
    class Meta:
        model = Follower
        fields = ('subscriber', )

Answer 2

[mascai]

Для нвчала попробуй заменить логику с бросанием исключения
user = UserSonet.objects.get(id=pk)

на
user = UserSonet.objects.filter(id=pk)

Comments

[nnn Xion]

Спасибо, так будет лучше. Но прежняя ошибка всё ещё существует

[nnn Xion]

Спасибо, вы подтолкнули на то как всё починить