为什么 Django 会抛出类似“'function' object has no attribute 'order_set'”这样的错误？

Question

我编辑了 views.py，然后它抛出了如下截图所示的错误。

这是代码。
/apps/views.py 包含

from django.shortcuts import render
from django.http import HttpResponse
from .models import *
    
def customer(request, pk):
  customers = Customer.objects.get(id=pk)
    
   order = customer.order_set.all()
    
   context={'customers':customers, 'order':order}
   return render(request, 'accounts/customer.html',context)

和 /templates/apps/name。html 包含此代码以将数据从模型渲染到模板。

{% for i in order %}
 <tr>
    <td>{{i.product}}</td>
    <td>{{i.product.category}}</td>
    <td>{{i.date_created}}</td>
    <td>{{i.status}}</td>
    <td><a href="">Update</a></td>
    <td><a href="">Remove</a></td>
 </tr>
{% endfor %}

我认为这个错误与 views.py 中的 order_ser 有关，但我不确定如何修复它。

Answer 1

你写了customers = customer.objects.get(id=pk)，然后你用了customer.order_set，这里的customer指的是customer函数。你应该使用 customer:

from django.shortcuts import get_object_or_404, render
from django.http import HttpResponse
from .models import *
    
def customer(request, pk):
    #      ↓ without s
    <strong>customer</strong> = get_object_or_404(Customer, id=pk)
    order = <strong>customer.</strong>order_set.all()
    
    context={'customer': customer, 'order':order}
    return render(request, 'accounts/customer.html', context)

Note: It is often better to use get_object_or_404(…) [Django-doc], then to use .get(…) [Django-doc] directly. In case the object does not exists, for example because the user altered the URL themselves, the get_object_or_404(…) will result in returning a HTTP 404 Not Found response, whereas using .get(…) will result in a HTTP 500 Server Error.

为什么 Django 会抛出类似“'function' object has no attribute 'order_set'”这样的错误？

Why django throwing error like " 'function' object has no attribute 'order_set' "?

django

django-templates

django-models

django-views