RelatedObjectDoesNotExist: User has no customer

Question

I am following a Django youtube E-comerce tutorial by Dennis Ivy. I follow the tutorial line by line. from the initial i use to run the program and view all the output but alone the way i start getting this error message "RelatedObjectDoesNotExist: User has no customer". Am confuse because i keep repeating the video to see where i was wrong but could not trace it. please what is the solution? I realise the last time i tried, it open on its own using 'internet explorer' it display. when i open in 'chrome', it show the same erro. but when i deleted a customer from database it start showing the same erro again in 'internet explorer'. I dont want to give up on the tutorial cos i need it. please someone should assist me. Thanks

from multiprocessing import context
from django.shortcuts import render
from .models import *
from django.contrib.auth.models import User
from django.http import JsonResponse
import json

# Create your views here.
def store(request):
    if request.user.is_authenticated:
        customer = request.user.customer
        order, created=Order.objects.get_or_create(customer=customer, complete =False)
        items =order.orderitem_set.all()
        cartItems=order.get_cart_items

    else:
        items=[]
        order = {'get_cart_total':0, 'get_cart_items':0}
        cartItems=order['get_cart_items']

    products = Product.objects.all()
    context = {
        'products':products,
        'cartItems':cartItems,
        
        
    }
    return render(request, 'store/store.html', context)

def cart(request):
    if request.user.is_authenticated:
        customer = request.user.customer
        order, created=Order.objects.get_or_create(customer=customer, complete =False)
        items =order.orderitem_set.all()
        cartItems=order.get_cart_items
        
    else:
        items=[]
        order = {'get_cart_total':0, 'get_cart_items':0}
        cartItems=order['get_cart_items']
    
    context = {
        'items':items,
        'order':order,
        'cartItems':cartItems,
    }
    return render(request, 'store/cart.html', context)

def checkout(request):
    if request.user.is_authenticated:
        customer = request.user.customer
        order, created=Order.objects.get_or_create(customer=customer, complete =False)
       # order, created=Order.objects.get_or_create(complete =False)
        items =order.orderitem_set.all()
    else:
        items=[]
        order = {'get_cart_total':0, 'get_cart_items':0}
        cartItems=order['get_cart_items']
    
    context = {
        'items':items,
        'order':order,
        'cartItems':cartItems
    }
    return render(request, 'store/checkout.html', context)

def updateItem(request):
    data = json.loads(request.data)
    productId = data['productId']
    action = data['action']

    print('Action:', action)
    print('productId:', productId)

    customer=request.user.customer
    product=Product.objects.get(id=productId)
    order, created=Order.objects.get_or_create(complete =False)

    orderItem, created=OrderItem.objects.get_or_create(order=order, product=product)

    if action =='add':
        orderItem.quantity =(orderItem.quantity +1)
    elif action =='remove':
        orderItem.quantity =(orderItem.quantity -1)
        orderItem.save()
    
    if orderItem.quantity <=0:
        orderItem.delete()



    return JsonResponse('Item was added', safe =False)

this is the models.py

import email
from django.db import models
from django.db.models.fields.related import OneToOneField
from django.contrib.auth.models import User
from numpy import product 

# Create your models here.

class Customer(models.Model):
    user=models.OneToOneField(User, null=True, blank=True, on_delete=models.CASCADE)
    name = models.CharField(max_length=200, null=True)
    email=models.CharField(max_length=200)

    def __str__(self):
        return self.name

        

class Product(models.Model):
    name = models.CharField(max_length=200, null=True)
    price = models.FloatField()
    digital=models.BooleanField(default=False, null=True, blank=True)
    image = models.ImageField(null=True, blank=True)

    def __str__(self):
        return self.name
    #this is  to avoid erro in the template when we delete image
    @property
    def imageURL(self):
        try:
            url=self.image.url
        except:
            url=''
        return url


class Order(models.Model):
    customer=models.ForeignKey(Customer, on_delete=models.SET_NULL, null=True, blank=True)
    date_ordered=models.DateTimeField(auto_now_add=True)
    complete = models.BooleanField(default=False)
    transaction_id = models.CharField(max_length=200, null=True)

    def __str__(self):
        return str(self.id)

    @property
    def get_cart_total(self):
        orderitems = self.orderitem_set.all()
        total = sum([item.get_total for item in orderitems])
        return total

    @property
    def get_cart_items(self):
        orderitems = self.orderitem_set.all()
        total = sum([item.quantity for item in orderitems])
        return total

    


class OrderItem(models.Model):
    product=models.ForeignKey(Product, on_delete=models.SET_NULL, null=True, blank=True)
    order=models.ForeignKey(Order, on_delete=models.SET_NULL, null=True, blank=True)
    quantity = models.IntegerField(default=0, null=True, blank=True)
    date_added=models.DateTimeField(auto_now_add=True)

    @property
    def get_total(self):
        total = self.product.price * self.quantity
        return total


class ShippingAddress(models.Model):
    customer=models.ForeignKey(Customer, on_delete=models.SET_NULL, null=True, blank=True)
    order=models.ForeignKey(Order, on_delete=models.SET_NULL, null=True, blank=True)
    address= models.CharField(max_length=200, null=True)
    city = models.CharField(max_length=200, null=True)
    state = models.CharField(max_length=200, null=True)
    zipcode = models.CharField(max_length=200, null=True)
    date_added=models.DateTimeField(auto_now_add=True)

    def __str__(self):
        return self.address

this is the urls.py

from django.urls import path
from . import views

urlpatterns = [
    path('', views.store, name = 'store'),
    path('cart/', views.cart, name = 'cart'),
    path('checkout', views.checkout, name = 'checkout'),
    path('update_item/', views.updateItem, name='update_item')
]

Answer 1

you can use the request.user to query the customer

customer = Customer.objects.get(user__id = request.user.id)