django - django forms is_valid() 方法总是返回 true 如果所有表单字段的要求都是 false

Question

models.py 创建了一个模型 registerForm.my 数据库是mysql。

from django.db import models

class registerForm(models.Model):
    name = models.CharField(max_length=50 )
    username = models.CharField( max_length=50)
    email = models.EmailField(max_length=50)
    password = models.CharField(max_length=50)
    class Meta:
        db_table = 'userForm'
    def __str__(self):
        return self.name    

表格.py

from django import forms
from django.forms import widgets
from login_and_logout.models import registerForm

class regForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        # first call parent's constructor
        super(regForm, self).__init__(*args, **kwargs)
        # there's a `fields` property now
        self.fields['name'].required = False
        self.fields['username'].required = False
        self.fields['email'].required = False
        self.fields['password'].required = False

    class Meta: 
        model = registerForm
        fields = "__all__"

视图.py

check form is valid using is_valid() method 
    def signup(request):
    
        if request.method == 'POST':
            form = regForm(request.POST)

            print(form.is_valid())
    
            if form.is_valid():
                return HttpResponse('success')
            else:
                return  HttpResponse('fail')
        form = regForm()
        return render(request, 'signup.html', {'form': form})

我试图在客户端使用 javascript 和 dajngo 中的服务器端验证来实现表单验证。为了在没有必需属性的情况下实现表单验证，我在 dajngo forms.py 中给出了必需的 false。但是在 is_valid() 方法之后总是返回 true。但是，如果我删除了用于删除 forms.py 中所需字段的 init 函数，则 is_valid() 有效。我想删除必填字段，并且我想使用 is_valid() 方法。

Answer 1

您 print(print(form.is_valid()) 有效表单的语句不在任何条件语句下检查是否满足保存有效表单的条件，这就是它返回 True 的原因。

 def signup(request):
        if request.method == 'POST':
            form = regForm(request.POST)
            # This where your conditional check for valid form starts from
            # So you are suppose to put the print statement below the condition if statement 
            # All the logic of validations starts from the if statement
            if form.is_valid():
                print(form.is_valid())
                data = form.save(commit=False)
                data.username = request.user 
                # whatever data that you want to check for validation  before saving it.
                data.save()
                return HttpResponse('success')
            else:
                return  HttpResponse('fail')
        form = regForm()
        return render(request, 'signup.html', {'form': form})