如果空值传递给Django中的表单字段，如何验证表单？答案

【问题标题】：How to validate form if empty values passed to form fields in Django?如果空值传递给Django中的表单字段，如何验证表单？
【发布时间】：2020-01-27 01:39:28
【问题描述】：

下面是表格：

努力通过为某些表单字段发送空值来验证表单。

姓名和电话是必填字段。当用户输入并单击提交时，所有值应连接并保存在文件中。

forms.py

from django import forms

class ReviewForm1(forms.Form):
    PRECAUTIONS_CHOICES = (
        ('no', 'No'),
        ('yes', 'Yes')
    )
    UNIT1_CHOICES = (
        ('Very Satisfied', 'Very Satisfied'),
        ('Satisfied', 'Satisfied'),
        ('neutral', 'neutral'),
        ('Unsatisfied', 'Unsatisfied'),
        ('Very Unsatisfied', 'Very Unsatisfied'),
    )
    name = forms.CharField(required=True, widget=forms.TextInput(attrs={'required': 'true'}))
    phone = forms.CharField(required=False)
    email = forms.EmailField(required=True, widget=forms.TextInput(attrs={'required': 'true'}))
    precautions = forms.ChoiceField(required=True, choices= PRECAUTIONS_CHOICES, widget=forms.Select())
    unit1_ambience = forms.ChoiceField(required=True, choices= UNIT1_CHOICES, widget=forms.Select())
    review = forms.CharField(required=False, widget=forms.Textarea())

    def clean(self):
        name = self.cleaned_data.get('name')
        phone = self.cleaned_data.get('phone')
        review = self.cleaned_data.get('review')
        email = self.cleaned_data.get('email')
        precautions = self.cleaned_data.get('precautions')
        unit1_ambience = self.cleaned_data.get('unit1_ambience')
        expected_string = ''
        options = [name,phone,review,email,precautions,unit1_ambience]
        for option in options:
            if not option:
                continue
            else:
                expected_string = expected_string + option + '\n'

        # concat all with review and then return string
        return expected_string

views.py sn-p

@require_POST
@csrf_protect
def revfile_save(request):
   """
   This page processes and saves review file.
   """
   form = ReviewForm1(request.POST)
    if form.is_valid():
        review = form.cleaned_data
   reviewfile_name = "/root/sjfacweb/" + remote.sjfacweb()
   #content writes to timestamped filename
   remote.write_reviewfile(reviewfile_name,False,review)

以下是点击保存时出现的错误：

分配前引用的局部变量“review”

我认为 form.is_valid() 返回 false，如何解决这个问题？

谢谢

【问题讨论】：

标签： python django

【解决方案1】：

这与“空字段”没有任何关系。该视图的其余部分应位于 is_valid 块内，并且您应该执行其他操作 - 即使用无效表单重新呈现模板 - 当表单无效时。

form = ReviewForm1(request.POST)
if form.is_valid():
    review = form.cleaned_data
    reviewfile_name = "/root/sjfacweb/" + remote.sjfacweb()
    #content writes to timestamped filename
    remote.write_reviewfile(reviewfile_name,False,review)
    return redirect('somewhere')
else:
    return render(request, 'template.html', {'form': form})

请注意，clean() 应该将清理后的数据作为字典返回，而不是串联字符串；连接应该在其他地方完成。

【讨论】：