我正在尝试检索所选项目的总数
由用户在购物车中购买。
用户退房时，他将被重定向到“订单”页面，其中
用户填写所有信息并提交订单。但是总金额未反映在数据库中。
forms.py（在我的订单应用中）
from django import forms
from .models import Order
class OrderCreateForm(forms.ModelForm):
class Meta:
model = Order
fields = ['first_name', 'last_name', 'email', 'address',
'postal_code', 'city']
models.py（在我的订单应用中）
from django.db import models
from shop.models import Product
class Order(models.Model):
first_name = models.CharField(max_length=60)
last_name = models.CharField(max_length=60)
email = models.EmailField()
address = models.CharField(max_length=150)
postal_code = models.CharField(max_length=30)
city = models.CharField(max_length=100)
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
paid = models.BooleanField(default=False)
total_cost = models.DecimalField(max_digits=100,
decimal_places=3, default=0)
class Meta:
ordering = ('-created', )
def __str__(self):
return 'Order {}'.format(self.id)
def total_cost(self):
return sum([item.total_cost for item in self.items.all()])
def get_total_cost(self):
return sum(item.get_cost() for item in self.items.all())
class OrderItem(models.Model):
order = models.ForeignKey(Order, related_name='items',
on_delete=models.CASCADE)
product = models.ForeignKey(Product,
related_name='order_items', on_delete=models.CASCADE)
price = models.DecimalField(max_digits=10, decimal_places=2)
quantity = models.PositiveIntegerField(default=1)
total_price = models.DecimalField(max_digits=100,
decimal_places=3, default=0)
def __str__(self):
return '{}'.format(self.id)
def get_cost(self):
return self.price * self.quantity
views.py（在我的订单应用中）
from django.shortcuts import render
from .models import OrderItem
from django.contrib.auth.decorators import login_required
from .forms import OrderCreateForm
from cart.cart import Cart
@login_required
def order_create(request):
cart = Cart(request)
if request.method == 'POST':
form = OrderCreateForm(request.POST)
if form.is_valid():
order = form.save()
for item in cart:
OrderItem.objects.create(
order=order,
product=item['product'],
price=item['price'],
quantity=item['quantity'],
total_price=item['total_price'],
)
cart.clear()
return render(request, 'created.html', {'order': order})
else:
form = OrderCreateForm()
return render(request, 'create.html', {'form': form})
我已经使用了脆性表单来呈现表单
create.html
{% extends 'base.html' %}
{% load crispy_forms_tags %}
{% load static %}
{% block title %}
Your Shopping Cart| Checkout
{% endblock %}
{% block content %}
<div class="container">
<div class="row" style="margin-top: 6%">
<div class="col-md-8">
<h4 class="page-header">Billing Details</h4>
<form action="." method="post">
{% csrf_token %}
{{ form | crispy }}<br>
<input type="submit" class="btn btn-primary"
value="Submit order">
</form>
</div>
<div class="col-md-4">
<div class="page-header">
Your Order
<li class="list-group-item ">Total Cost: Rs {{
cart.get_total_price }}</li>
</div>
<ul class="list-group">
{% for item in cart %}
<li class="list-group-item">
{{ item.quantity }} x {{ item.product.name }}
<span>Rs. {{ item.total_price }}</span>
</li>
{% endfor %}
</ul>
</div>
</div>
</div>
{% endblock %}
Cart.py（在我的购物车应用中）
from decimal import Decimal
from django.conf import settings
from shop.models import Product
class Cart(object):
def __init__(self, request):
self.session = request.session
cart = self.session.get(settings.CART_SESSION_ID)
if not cart:
cart = self.session[settings.CART_SESSION_ID] = {}
self.cart = cart
def add(self, product, quantity=1, update_quantity=False):
product_id = str(product.id)
if product_id not in self.cart:
self.cart[product_id] = {'quantity': 0, 'price':
str(product.price)}
if update_quantity:
self.cart[product_id]['quantity'] = quantity
else:
self.cart[product_id]['quantity'] += quantity
self.save()
def save(self):
self.session[settings.CART_SESSION_ID] = self.cart
self.session.modified = True
def remove(self, product):
product_id = str(product.id)
if product_id in self.cart:
del self.cart[product_id]
self.save()
def __iter__(self):
product_ids = self.cart.keys()
products = Product.objects.filter(id__in=product_ids)
for product in products:
self.cart[str(product.id)]['product'] = product
for item in self.cart.values():
item['price'] = Decimal(item['price'])
item['total_price'] = item['price'] * item['quantity']
yield item
def __len__(self):
return sum(item['quantity'] for item in self.cart.values())
def get_total_price(self):
return sum(Decimal(item['price']) * item['quantity'] for item in
self.cart.values())
def clear(self):
del self.session[settings.CART_SESSION_ID]
self.session.modified = True
admin.py（在我的订单应用中）
from django.contrib import admin
from .models import Order, OrderItem
class OrderItemInline(admin.TabularInline):
model = OrderItem
raw_id_fields = ['product']
class OrderAdmin(admin.ModelAdmin):
list_display = ['id', 'first_name', 'last_name', 'email',
'address', 'postal_code', 'city', 'total_cost', 'paid',
'created','updated']
list_filter = ['paid', 'created', 'updated']
inlines = [OrderItemInline]
admin.site.register(Order, OrderAdmin)
输出：-
这些是模板和数据库的输出，在这里我们可以看到总价格为0.00
答案 0 :(得分：0)
您仅在total_price中修改OrderItem
您没有使用total_price对象的Order做任何事情，因此将保持为0
我建议您做的是为订单计算出一个total_price字段。
所以，相反：
class Order(models.Model):
total_price = models.DecimalField(max_digits=100,
decimal_places=3, default=0)
类似的东西：
class Order(models.Model):
def total_price(self):
return sum([item.total_price for item in self.items.all()])
请记住，尽管我认为没有必要，也许您需要稍微调整一下“管理员”视图才能显示该字段，