在Django ModelForm中使用clean时，获取错误对象没有属性``get''

问题描述

我正在尝试自定义验证我的模型表格。为此，我编写了以下代码：

I am trying to custom validate my model form. For the purpose, I wrote the following code:

class StudentForm(forms.ModelForm):

    class Meta:
        model = Student
        fields = '__all__'

    def clean(self):

        batch_start_year = self.cleaned_data.get('batch_start_year',None)

我遇到类似以下错误：

'StudentForm' object has no attribute 'get'

我尝试了另一种解决方案，但是也没有用。

I tried another solution, but it didn't work either.

class StudentForm(forms.ModelForm):

    class Meta:
        model = Student
        fields = '__all__'

    def clean(self):
        cleaned_data = super(StudentForm, self).clean()

        batch_start_year = cleaned_data['batch_start_year']

请帮助我解决此问题。

完整堆栈跟踪：

Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 149, in get_response
    response = self.process_exception_by_middleware(e, request)
  File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 147, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/shahjahan/Desktop/jmialumniusa/jmialumniusa_app/views.py", line 18, in apply
    if form.is_valid():
  File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py", line 161, in is_valid
    return self.is_bound and not self.errors
  File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py", line 153, in errors
    self.full_clean()
  File "/usr/local/lib/python2.7/dist-packages/django/forms/forms.py", line 364, in full_clean
    self._post_clean()
  File "/usr/local/lib/python2.7/dist-packages/django/forms/models.py", line 377, in _post_clean
    exclude = self._get_validation_exclusions()
  File "/usr/local/lib/python2.7/dist-packages/django/forms/models.py", line 337, in _get_validation_exclusions
    field_value = self.cleaned_data.get(field)
AttributeError: 'StudentForm' object has no attribute 'get'

推荐答案

您应该从 clean（）方法返回已清理的数据，否则会引发错误。

You should return cleaned data from clean() method or raise error. You are not doing that.

class StudentForm(forms.ModelForm):

    class Meta:
        model = Student
        fields = '__all__'

    def clean(self):
        batch_start_year = self.cleaned_data.get('batch_start_year',None)
        # do something
        return self.cleaned_data

这篇关于在Django ModelForm中使用clean时，获取错误对象没有属性``get''的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！