'Account' object has no attribute 'products' AND (fields.E301) Field defines a relation with the model 'auth.User', which has been swapped out.' - django-models

Question

I am following Django rest_framework tutorial to build my app but and I'm using a custom user model (Account) which inherits AbstractBaseUser.
I have another model - Product - and each product is owned by an Account.
My models.py is:
from django.db import models
from django.contrib.auth.models import AbstractBaseUser, BaseUserManager
from django.conf import settings
class Product(models.Model):
owner = models.ForeignKey(Account, related_name='account', on_delete=models.CASCADE, default=1)
name = models.CharField(max_length=71)
product = models.CharField(max_length=20, blank=True)
price = models.IntegerField(null=True, blank=True)
quantity = models.IntegerField(default=0)
image = models.ImageField(upload_to='images', blank=True)
display = models.BooleanField(default=False)
created = models.DateTimeField('date added', auto_now=True)
modified = models.DateTimeField('date modified', auto_now_add=True)
def __str__(self):
return self.name
class MyAccountManager(BaseUserManager):
def create_user(self, email, username, password=None):
if not email:
raise ValueError("Please enter a valid email address")
if not username:
raise ValueError("Please enter a username")
user = self.model(
email = self.normalize_email(email),
username = username,
)
user.set_password(password)
user.save(using=self._db)
return user
def create_superuser(self, email, username, password):
user = self.create_user(
email = self.normalize_email(email),
password = password,
username = username,
)
user.is_admin = True
user.is_staff = True
user.is_superuser = True
user.save(using=self._db)
return user
class Account(AbstractBaseUser):
email = models.EmailField(verbose_name='email', max_length=60, unique=True)
username = models.CharField(max_length=30, unique=True)
date_joined = models.DateTimeField(verbose_name='date joined', auto_now_add=True)
last_login = models.DateTimeField(verbose_name='last_login', auto_now_add=True)
is_admin = models.BooleanField(default=False)
is_active = models.BooleanField(default=True)
is_staff = models.BooleanField(default=False)
is_superuser = models.BooleanField(default=False)
is_merchant = models.BooleanField(default=False)
USERNAME_FIELD = 'email'
REQUIRED_FIELDS = ['username']
objects = MyAccountManager()
def __str__(self):
return self.email
def has_perm(self, perm, obj=None):
return self.is_admin
def has_module_perms(self, app_label):
return True
My settings.py includes:
AUTH_USER_MODEL = 'accounts.Account'
My serializers.py is:
from rest_framework import serializers
from inventory.models import Product
from accounts.models import Account
class AccountSerializer(serializers.ModelSerializer):
products = serializers.PrimaryKeyRelatedField(many=True, queryset=Product.objects.all())
password2 = serializers.CharField(style={'input_type': 'password'}, write_only=True)
class Meta:
model = Account
fields = ['products', 'email', 'username', 'password', 'password2']
extra_kwargs = {
'password': {'write_only': True}
}
def save(self):
account = Account(
email = self.validated_data['email'],
username = self.validated_data['username'],
)
password = self.validated_data['password']
password2 = self.validated_data['password2']
if password != password2:
raise serializers.ValidationError({'password': 'Passwordss must match.'})
account.set_password(password)
account.save()
return account
class ProductSerializer(serializers.ModelSerializer):
owner = serializers.ReadOnlyField(source='owner.email')
class Meta:
model = Product
fields = [
'id', 'owner', 'name', 'product', 'price', 'quantity', 'image', 'display'
]
My views.py is:
from accounts.api.serializers import AccountSerializer
from inventory.api.serializers import ProductSerializer
from inventory.models import Product
from accounts.models import Account
from rest_framework import permissions
from rest_framework import generics
class AccountList(generics.ListAPIView):
queryset = Account.objects.all()
serializer_class = AccountSerializer
class AccountDetail(generics.RetrieveAPIView):
queryset = Account.objects.all()
serializer_class = AccountSerializer
class ProductList(generics.ListCreateAPIView):
permission_classes = [permissions.IsAuthenticatedOrReadOnly]
queryset = Product.objects.all()
serializer_class = ProductSerializer
def perform_create(self, serializer):
serializer.save(owner=self.request.user)
class ProductDetail(generics.RetrieveUpdateDestroyAPIView):
permission_classes = [permissions.IsAuthenticatedOrReadOnly]
queryset = Product.objects.all()
serializer_class = ProductSerializer
I am able to view my ProductList and ProductDetail however, I get the following error when I try to view AccountList and AccountDetail:
**Exception Type:** AttributeError
**Exception Value:** 'Account' object has no attribute 'products'

Answer 1

Just change your serailzier like this
class AccountSerializer(serializers.ModelSerializer):
products = serializers.SerializerMethodField()
password2 = serializers.CharField(style={'input_type': 'password'}, write_only=True)
def get_products(self, instance):
return Product.objects.all().values_list('id', flat=True)
class Meta:
model = Account
fields = ['products', 'email', 'username', 'password', 'password2']
extra_kwargs = {
'password': {'write_only': True}
}
def save(self):
account = Account(
email = self.validated_data['email'],
username = self.validated_data['username'],
)
password = self.validated_data['password']
password2 = self.validated_data['password2']
if password != password2:
raise serializers.ValidationError({'password': 'Passwordss must match.'})
account.set_password(password)
account.save()
return account
PrimaryKeyRelatedField may be used to represent the target of the relationship using its primary key. The queryset used for model instance lookups when validating the field input. Your field is read_only field. Your should use SerializerMethodField for this.