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尝试实现 django-multiupload 应用程序时，我不断收到以下完整性错误：

“post_id”列中的空值违反非空约束细节：失败行包含（9，post_images/1899987_718836594813781_835045800_n.jpg，，null，null，null）。

我试图让我的用户将多张图片上传到帖子中。我认为我出错的地方是它可能会在获得帖子ID之前进行保存。在我看来，我已经更改了 form_valid，这也可能对其产生影响。

理想情况下，我也想将 picture_author 和 project 实例传递给每个图像，但开始时我已经将它们设置为 = null 以弄清楚目前如何仅传递 post 实例。

我是编码和 django 的新手，所以任何尝试解决它的帮助将不胜感激！

楷模：

class ProjectPost(models.Model):
    project = models.ForeignKey(UserProject)
    title = models.CharField(max_length=100)
    post_overview = models.CharField(max_length=1000)
    date_created = models.DateTimeField(auto_now_add=True)
    post_views = models.IntegerField(default=0)
    post_likes = models.IntegerField(default=0)
    post_author = models.ForeignKey(User, null=True)


class PostImages(models.Model):
    post_picture = models.FileField(upload_to='post_images', blank=True) 
    post = models.ForeignKey(ProjectPost)
    picture_description = models.CharField(max_length=100)
    picture_author = models.ForeignKey(User, null=True)
    project = models.ForeignKey(UserProject, null=True)

形式

class ProjectPostForm(forms.ModelForm):

    class Meta:
        model = ProjectPost
        fields = ('title', 'post_overview')

    files = MultiFileField(min_num=1, max_num=20, max_file_size=1024*1024*5)

    def save(self, commit=True):
        instance = super(ProjectPostForm, self).save(commit)
        for each in self.cleaned_data['files']:
            PostImages.objects.create(post_picture=each, post=instance)

        return instance

意见

class NewPost(CreateView):
    model = ProjectPost
    form_class = ProjectPostForm
    template_name = 'howdidu/new_post.html'

    def form_valid(self, form):
        self.object = form.save(commit=False)
        project = UserProject.objects.get(slug=self.kwargs["slug"])
        self.object.project = project
        form.instance.post_author = self.request.user
        self.object.save()
        return super(NewPost, self).form_valid(form)

    def get_success_url(self):
        project_username = self.request.user.username
        project_slug = self.object.project.slug
        return reverse('user_project', kwargs={'username':project_username, 'slug': project_slug})
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1 回答 1

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您必须先保存帖子，然后才能向其中添加图像。在保存图像之前，您需要明确告诉 get_or_create post_id 应该是什么，我认为您不会在代码中这样做。

于 2015-12-18T05:11:16.667 回答