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python - 视图中出现多个错误，编辑模型列表

问题描述

我正在尝试查看和编辑我的客户模型-

我正在做的是当您第一次打开服务器时，客户列表会作为链接打开。就像我按下假设客户 1 一样。

一旦我进行更改并按下保存按钮，表格就会显示得很好，它给了我错误-

Page not found (404)
Request Method: POST
Request URL:    http://127.0.0.1:8000/marketing/editcustomer/2250a9b1-5d25-4bce-b426-e3a4abb45abb/POST

我也有后退按钮 - 按后退按钮后我也遇到同样的错误！

然后，如果我返回customerlist(seecustomer)并再次单击同一客户或任何其他客户，则会出现以下错误-

Manager isn't accessible via customer instances

有时它也会给 -

First argument to get_object_or_404() must be a Model, Manager, or QuerySet, not 'customer'.

我的模型.py

class customer(models.Model):
    customerid=models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    customername=models.CharField(max_length=1000)

我的意见.py

def editcustomer(request,customer_pk):
    global customer
    customer=get_object_or_404(customer,pk=customer_pk,user=request.user)
    if request.method=='GET':
        form=createcustomerform(instance=customer)
        return render(request,'marketing/editcustomer.html',{'customer':customer,'form':form})
    else:
        try:
            form=createcustomerform(request.POST,instance=customer)
            form.save()
            return redirect('seecustomer')
        except ValueError:
            return render(request,'marketing/editcustomer.html',{'customer':customer,'form':form,'error':'Incorrect entry'})

我的html表单代码-

<form action="POST" method="POST">
{% csrf_token %}
<div id="customername"> <span><label for="customername">Company Name</label></span>
  <input type="text" id="customername" name="customername" placeholder="Enter Company's Full name" value="{{ customer.customername}}"> </div>
<button class="btn btn-primary btn-md" type="submit">Save</button>
<br>
<input type="button" class="btn btn-primary btn-md" value="Go Back" onclick="history.back(-1)" />
</form>

标签： pythonhtmldjangodjango-modelsinstance

解决方案

发生这种情况的原因是因为在第一次get_object_or_404调用之后，customer是一个customer 对象，不再是类。

例如，您可以使用大写字母导入模型：

from app.models import customer as Customer

def editcustomer(request,customer_pk):
    customer=get_object_or_404(Customer,pk=customer_pk,user=request.user)
    if request.method=='GET':
        form=createcustomerform(instance=customer)
        return render(request,'marketing/editcustomer.html',{'customer':customer,'form':form})
    else:
        try:
            form=createcustomerform(request.POST,instance=customer)
            form.save()
            return redirect('seecustomer')
        except ValueError:
            return render(request,'marketing/editcustomer.html',{'customer':customer,'form':form,'error':'Incorrect entry'})

所以在这里我们删除global部分，并使用 alias Customer。话虽如此，我强烈建议使用PEP-8 样式指南，因此将类的名称写在PerlCase，而不是snake_case. 在这种情况下，您可以简单地使用以下命令导入它：

from app.models import Customer

def editcustomer(request,customer_pk):
    customer=get_object_or_404(Customer,pk=customer_pk,user=request.user)
    if request.method=='GET':
        form=createcustomerform(instance=customer)
        return render(request,'marketing/editcustomer.html',{'customer':customer,'form':form})
    else:
        try:
            form=createcustomerform(request.POST,instance=customer)
            form.save()
            return redirect('seecustomer')
        except ValueError:
            return render(request,'marketing/editcustomer.html',{'customer':customer,'form':form,'error':'Incorrect entry'})

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