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我有一个非常简单的 django 表单，用于出租默认用户的到期日期的密钥，用户可以更改日期，然后继续保存表单。但是，每当我保存时key_instance，django 都会抛出一个error: expected string or bytes-like object. 我知道 datetime 对象导致了此错误，因为如果我将其注释掉，一切正常。这是我的 views.py 和 forms.py

表格.py：

class UpdateKeyRequestForm(forms.Form):

    APPROVE_CHOICES = [
        ('d', 'Deny this key request'),
        ('a', 'Approve this key request')

    ]

    request_status = forms.CharField(label='Please select to accept or deny this request.',widget=forms.Select(choices=APPROVE_CHOICES))

    due_date = forms.DateField(help_text='Enter a date (YYYY-MM-DD) between now and 4 weeks (default 3). ')

    def clean_due_date(self):
        due_date = self.cleaned_data['due_date']
        approved_status = self.cleaned_data['request_status']

        # Check date is not in past.
        if due_date < datetime.date.today():
            raise ValidationError(_('Invalid date - renewal in past'))
        if due_date > datetime.date.today() + datetime.timedelta(weeks=4):
            raise ValidationError(_('Invalid date - renewal more than 4 weeks ahead'))


        return due_date, approved_status

视图.py：

@permission_required('catalog.can_mark_returned')
def update_key_request(request, pk):
    """
    View function for renewing a specific keyInstance by admin
    """
    key_inst=get_object_or_404(KeyInstance, pk=pk)


    # If this is a POST request then process the Form data
    if request.method == 'POST':

        # Create a form instance and populate it with data from the request (binding):
        form = UpdateKeyRequestForm(request.POST)

        # Check if the form is valid:
        if form.is_valid():
            # process the data in form.cleaned_data as required (here we just write it to the model due_back field)
            request_status = form.cleaned_data['request_status']
            due_date = form.cleaned_data['due_date']
            if request_status == 'a':
                key_inst.due_back = due_date
                key_inst.status = 'o'
                key_inst.date_out = datetime.date.today()
                key_inst.save()
            else:
                key_inst.status = 'a'
                key_inst.save()

            # redirect to a new URL:
            return HttpResponseRedirect(reverse('all-available-keys'))
    else:
        default_due_date = datetime.date.today() + datetime.timedelta(weeks=3)
        form = UpdateKeyRequestForm(initial={'due_date': default_due_date})

    #If this is a GET (or any other method) create the default form.

    return render(request, 'catalog/roomkey_request_update.html', {'form': form, 'keyinst': key_inst})

但问题是我用完全相同的方法实现了这个确切的逻辑来更新截止日期，它仍然可以正常工作。我很困惑为什么这个会引发错误。任何人都可以阐明一下吗？

这是错误页面上的本地变量：

due_date    
(datetime.date(2018, 6, 13),)
form    
<UpdateKeyRequestForm bound=True, valid=True, fields=(due_date)>
key_inst    
<KeyInstance: Conestogo River (3fc9458a-5ec8-46a3-a04e-6a48e650b15f)>
pk  
UUID('3fc9458a-5ec8-46a3-a04e-6a48e650b15f')
request 
<WSGIRequest: POST '/catalog/key/3fc9458a-5ec8-46a3-a04e-6a48e650b15f/update'>
4

1 回答 1

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您的clean_due_date方法应该只返回due_date.

def clean_due_date(self):
    ...
    return due_date

你似乎没有approved_status在那个方法中使用，所以我会从方法中删除这一行

approved_status = self.cleaned_data['request_status']

如果您确实需要清理相互依赖的字段，那么您应该在clean()方法而不是clean_<fieldname>方法中执行此操作。

于 2018-05-23T14:04:23.153 回答