python - 创建自定义primary_key字段

Question

我最初有 Django 模型的标准默认 id 字段。但是我想切换到随机的 10-15 字母数字字符串。

如果您好奇的话，这是字符串(它有效):

def random_string(chars=string.ascii_letters + string.digits):
    size = random.randrange(10, 15)
    return str(''.join(random.choice(chars) for _ in range(size)))

这是我的模型。我只是在字段中添加并执行了 migrate 和 makemigrations:

class Post(models.Model):
    id = models.CharField(max_length=18, primary_key=True, default=random_string())
    user = models.ForeignKey(User, blank=True, null=True)
    content = models.TextField(null=True, blank=True)

预计它不会顺利转换 - 当我发帖时，我收到以下non_field_error:

Non Errors: <bound method BaseForm.non_field_errors of <PostForm bound=False, valid=False, fields=(content;id;user)>>
[20/Mar/2018 09:38:37] "POST /post/ HTTP/1.1" 200 11482

观看次数

def post(request):

    if request.user.is_authenticated():
        form_post = PostForm(request.POST or None, request.FILES or None)
        if form_post.is_valid():
            instance = form_post.save(commit=False)
            instance.user = request.user

            instance.save()

            return HttpResponseRedirect('/')
        else:
            form_post = PostForm()
            print('Errors:', form_post.errors) #prints nothing
            print('Non Errors:', form_post.non_field_errors) 

        context = {
            'form_post': form_post,
        }

        return render(request, 'post/post.html', context)
    else:
        return HttpResponseRedirect("/accounts/signup/")

谁能告诉我为什么会出现non_field_error？以下是该模型的随附表格:

class PostForm(forms.ModelForm):

    class Meta:
        model = Post
        fields = [
            'content',
            'id',
            'user'
        ]

Answer 1

non_field_errors 是一种方法，而不是常规属性，errors 是:

print('Non Errors:', form_post.non_field_errors())