python - Django 更新数据库中的对象

Question

我正在尝试运行一个简单的更新表单，该表单应该更新从表单提交的数据库中的所有对象值。

这是我的更新 View ，除了重定向到“/”之外什么也不做。没有错误，但也没有更新。

def update(request, business_id):
    if request.method == 'POST':
        form = BusinessForm(request.POST)

        if form.is_valid():
            t = Business.objects.get(id=business_id)
            t.save()
        return HttpResponseRedirect("/")
    else:
          ...

Answer 1

您没有更新任何字段，请使用 form.cleaned_data获取表单字段值:

Once is_valid() returns True, the successfully validated form data will be in the form.cleaned_data dictionary. This data will have been converted nicely into Python types for you.

if form.is_valid():
    t = Business.objects.get(id=business_id)
    t.my_field = form.cleaned_data['my_field']
    t.save()

此外，请考虑使用 UpdateView基于类的通用 View 而不是基于函数的:

A view that displays a form for editing an existing object, redisplaying the form with validation errors (if there are any) and saving changes to the object. This uses a form automatically generated from the object’s model class (unless a form class is manually specified).