django 表单请求 post 未加载数据

Question

我正在尝试将提交的数据加载到 Form 实例中，request.POST 具有有效值但表单没有。

class ArticleCreateForm(forms.Form):
    title = forms.CharField(max_length=255, widget=forms.TextInput(attrs={'autocomplete': 'off'}), label='')
    tagging = forms.CharField(max_length=255, required=False, widget=forms.TextInput(attrs={'autocomplete': 'off'}), label='')
    towhere = forms.CharField(max_length=20, required=False) # default to unchecked, save

    class Meta:
        fields = ['title', 'tagging', 'towhere']

    def clean_title(self):
        data = self.cleaned_data['title']
        if len(data) < 3:
            raise ValidationError('Title is too short')

    def clean_tagging(self):
        data = self.cleaned_data['tagging']
        if len(data) == 0 or data is None:
            raise ValidationError('Please add at least one tag')

@login_required
def articleChangeView(request, pk):
    try:
        article = Article.objects.get(pk=pk)
        if article.author != request.user:
            raise PermissionDenied()
        elif request.method == 'POST':
            form = forms.ArticleCreateForm(request.POST)
            print('--------')
            print(request.POST)
            print(form.cleaned_data)

<QueryDict: {'csrfmiddlewaretoken': ['gm0ODMFud35nhHlPdBr3IHVZXgtiDQV8zGPsscGWzcpylNVd0fnray7iodJvBWyb'], 'title': ['Title'], 'tagging': ['jquery']}>
{'title': None, 'tagging': None, 'towhere': ''}

我想知道为什么会这样，如果你能帮我一把我会很高兴

Answer 1

你首先应该调用 form.is_valid() [Django-doc]:

from django.shortcuts import get_object_or_404

@login_required
def articleChangeView(request, pk):
    article = get_object_or_404(Article, pk=pk, author=request.user)
    if request.method == 'POST':
        form = forms.ArticleCreateForm(request.POST)
        if <strong>form.is_valid()</strong>:
            print('--------')
            print(request.POST)
            print(form.cleaned_data)

您的 clean_<i>fieldname</i> 的 clean 方法也应该 return 清理后的值，因此：

class ArticleCreateForm(forms.Form):
    # …

    def clean_title(self):
        data = self.cleaned_data['title']
        if len(data) < 3:
            raise ValidationError('Title is too short')
        <strong>return data</strong>

    def clean_tagging(self):
        data = self.cleaned_data['tagging']
        if not data:
            raise ValidationError('Please add at least one tag')
        <strong>return data</strong>

django 表单请求 post 未加载数据

django form request post not loading data

django

post

django-forms