python - IntegrityError NOT NULL 约束失败

Question

我正在使用 Django 构建一个简单的博客应用程序。我想实现使用表单添加新博客的功能。出现一些问题。

这是我的 models.py

from django.db import models
from django.utils import timezone
from django.template.defaultfilters import slugify
from django.contrib.auth.models import User

class Blog(models.Model):
    title=models.CharField(max_length=60)
    content=models.TextField()
    author=models.ForeignKey('auth.User',on_delete=models.CASCADE,)
    date=models.DateTimeField(default=timezone.now)
    slug=models.SlugField(null=True,unique=True)

    def save(self, *args, **kwargs):
      self.slug = slugify(self.title)
      super(Blog, self).save(*args, **kwargs)

    def __str__(self):
        return self.title

class UserProfile(models.Model):
    user=models.OneToOneField(User)
    website=models.URLField(blank=True)

    def __str__(self):
        return self.user.username   

表单.py

 from django.template.defaultfilters import slugify
 from blog.models import UserProfile
 from django.contrib.auth.models import User

 class BlogForm(forms.ModelForm):
     title=forms.CharField(max_length=60,
                      help_text="blog title")
     content=forms.CharField(help_text="blog content")
     author=forms.CharField(help_text="blog author")
     date=forms.DateTimeField(help_text="blog date")

     class Meta:
         model=Blog
         fields=('title',)
 class UserForm(forms.ModelForm):
     password = forms.CharField(widget=forms.PasswordInput())

     class Meta:
         model=User
         fields = ('username','email','password')
 class UserProfileForm(forms.ModelForm):
     class Meta:
         model=UserProfile
         fields=('website',)

views.py 中的 add_blog 方法

def add_blog(request):    
form=BlogForm()    
if request.method =='POST':
    form=BlogForm(request.POST)
    if form.is_valid():
        form.save(commit=True)
        return index(request)
    else:
        print(form.errors)

return render(request, 'add_blog.html',{'form':form})

当我想在网页中添加新博客时，无法输入记录。它向我展示了

IntegrityError at /add_blog/
NOT NULL constraint failed: blog_blog.author_id

有人可以帮我解决这个问题吗？非常感谢!

Answer 1

在您的模型中，您的 Blog 类需要:

1. 标题
2. 作者，类型为 auth.User
3. 内容

第一步是从表单中删除作者字段:

class BlogForm(forms.ModelForm):
     title=forms.CharField(max_length=60,
                      help_text="blog title")
     content=forms.CharField(help_text="blog content")
     # author=forms.CharField(help_text="blog author")
     date=forms.DateTimeField(help_text="blog date")

     class Meta:
         model=Blog
         fields=('title','content','date')

接下来，将登录用户添加为您 View 中的作者:

from django.shortcuts import redirect
from django.contrib.auth.decorators import login_required

# makes sure this view is called with a valid user
# https://docs.djangoproject.com/en/2.0/topics/auth/default/#the-login-required-decorator
@login_required
def add_blog(request):    
   form = BlogForm(request.POST or {})    
   if form.is_valid():
        temp = form.save(commit=False)
        temp.author = request.user # add the logged in user, as the
                                   # author
        temp.save()
        return redirect('/')
   return render(request, 'add_blog.html',{'form':form})