Django querying models with foreignkey - django

Question

I am creating a project of customer management, in this I want to query some models which are related with foreign key.
I have created these models.
from django.db import models
class Customer(models.Model):
name = models.CharField(max_length=250, null=True)
phone = models.CharField(max_length=10, null=True)
email = models.CharField(max_length=250, null=True)
date_created = models.DateTimeField(auto_now_add=True, null=True)
# to get name as string on behalf of "Customer Object 1" in DB.
def __str__(self):
return self.name
class Tag(models.Model):
name = models.CharField(max_length=250, null=True)
def __str__(self):
return self.name
class Product(models.Model):
# To make a dropdown menu to choose category.
CATEGORY = (
('Indoor', 'Indoor'),
('Out Door', 'Out Door'),
)
name = models.CharField(max_length=250, null=True)
price = models.FloatField(null=True)
category = models.CharField(max_length=250, null=True, choices=CATEGORY)
description = models.CharField(max_length=250, null=True, blank=True)
date_created = models.DateTimeField(auto_now_add=True, null=True)
tags = models.ManyToManyField(Tag)
def __str__(self):
return self.name
class Order(models.Model):
# To make a dropdown menu to choose status.
STATUS = (
('Pending', 'Pending'),
('Out for Delivery', 'Out for Delivery'),
('Delivered', 'Delivered'),
)
customer = models.ForeignKey(Customer, null=True,
on_delete=models.SET_NULL)
product = models.ForeignKey(Product, null=True,
on_delete=models.SET_NULL)
date_created = models.DateTimeField(auto_now_add=True, null=True)
status = models.CharField(max_length=250, null=True, choices=STATUS)
Views.py
from django.shortcuts import render
from .models import *
def home(request):
customers = Customer.objects.all()
orders = Order.objects.all()
total_customers = customers.count()
total_orders = orders.count()
delivered = orders.filter(status='Delivered').count()
pending = orders.filter(status='Pending').count()
front_end_stuff = {'customers': customers, 'orders': orders,
'total_customers': total_customers, 'total_orders': total_orders,
'delivered': delivered, 'pending': pending,
}
return render(request, 'accounts/dashboard.html', context=front_end_stuff)
def products(request):
products_ = Product.objects.all()
return render(request, 'accounts/products.html', context={'products': products_})
def customer(request, pk):
customers = Customer.objects.filter(id=pk)
orders = Order.objects.filter(id=pk)
customer_products = Product.objects.filter(id=pk)
total_orders = orders.count()
front_end_stuff = {'customers': customers, 'orders': orders,
'total_orders': total_orders, 'customer_products': customer_products
}
return render(request, 'accounts/customer.html', context=front_end_stuff)
I want to get status of the orders placed by a specific customer, also i have set the dynamic urls for getting customer profile view page and in it i want to loop through it and print out the status in respective field.
I have attached the image of customer profile view page where i want the data.
customer_profile_view_page
I tried one query which i found on internet is :
customers = Customer.objects.filter(id=pk)
status = customers.order_set.all()
but I get an error
AttributeError: 'QuerySet' object has no attribute 'order_set'
I am using :
Windows 10,
Python 3.7,
Django 3.0.7.

Answer 1

To get the list of all the orders of a customer, you can try -
# this will give the list of orders for customer with id = pk
orders = Order.objects.filter(customer__id=pk) # it's a double underscore
You can iterate each order to fetch the status -
for order in orders:
print(order.status)
Or with what you tried, use .get instead of .filter.
customer = Customer.objects.get(id=pk) # the customer has to be present with this id else it will give an exception.
orders = customer.order_set.all()
Doc