我尝试更新Django图片时无法上传

时间:2019-03-28 16:49:26

标签: python django python-3.x

我正在使用django构建博客,我成功创建了一个新帖子,但是当我尝试更新该帖子时,所有已更新但图像未更新的操作,都没有将图像上传到Posts模型中的upload_to

这是我的代码

view.py

@login_required
def UpdatePost(request, pk):
    obj = get_object_or_404(Posts, id=pk)
    myForm = NewPostForm(instance = obj)
    if request.method == 'POST':
        myForm = NewPostForm(request.POST, request.FILES, instance=request.user.profile)
        response_data = {
            'SType': 'danger',
            'message': "An Error Occured, pls try again later"
        }
        title = request.POST.get('title')
        content = request.POST.get('content')
        category_id = request.POST.get('category')
        image = request.FILES.get('image') 
        if myForm.is_valid():
            if Posts.objects.filter(pk=pk).update(title=title, content=content, image=image, category_id=category_id, author_id=request.user.id):
                response_data = {
                    'SType': 'success',
                    'message': "Saved Successfully"
                } 
        return HttpResponse(json.dumps(response_data), content_type="application/json")
    context={ 
        'form':myForm,
        'title': obj.title,
        'category': Category.objects.all()
    }
    return render(request, 'blog/update.html', context) 

update.html

<form action="." method="POST" enctype="multipart/form-data" id="PostNew__form"> {% csrf_token %}
    <fieldset class="form-group">
        <legend class="border-bottom mb-4">Update a Blog Post</legend>
        <div class="form-row">
            <div class="form-group col-md-8 mb-0">
                {{ form.title | as_crispy_field }}
            </div>
            <div class="form-group col-md-4 mb-0">
                {{ form.category | as_crispy_field }}
            </div>                
        </div>
        {{ form.content | as_crispy_field }}
        <div class="">
            {{ form.image | as_crispy_field }}
        </div>

    </fieldset>
    <div class="form-group">
        <h6 id="PostNew__show" ></h6>
        <img src=" {% static 'images/ajax-loader.gif' %}" style="Display:none;" id="PostNew__img">
        <button class="btn btn-outline-info float-right" type="submit" id="PostNew__submit">Update</button>
    </div>
</form>

model.py

class Posts(models.Model):
    title = models.CharField(max_length=100)
    category = models.ForeignKey(Category, default="1", on_delete=models.CASCADE)
    content = models.TextField()
    date_posted = models.DateTimeField(default=timezone.now)
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    image = models.ImageField(default='default.jpg', upload_to='blog_pics')

    def __str__(self):
        return self.title

forms.py

class NewPostForm(forms.ModelForm):    
    class Meta:
        model = Posts
        fields = ['title', 'category', 'content', 'image']

请问我该如何解决这个问题,在数据库中,它存储文件名,但仅存储文件名,而没有upload_to文件夹

1 个答案:

答案 0 :(得分:1)

在Django文档中,它显示了如何通过创建Model实例将文件上传到Model。 queryset上的update()方法执行的操作不同,它会缩短字段的分配,以仅执行数据库查询。因此,它实际上不会将图像文件保存到存储中。

您应该在保存之前直接分配实例的文件字段,或者只保存表单。而且,您不必查询数据库,因为您已经具有传递给表单的实例。因此,要么这样做:

obj.image = image
obj.title = form.cleaned_data['title']
...
obj.save()

或者,因为您已经拥有ModelForm,您可以执行以下操作:

form.save()

但是请注意,您实例化表单的代码是错误的:

form = NewPostForm(request.POST, request.FILES, instance=obj)  # not request.user.profile 

如果由于您的模型要求的字段不属于表单而无法直接保存该表单,则应使用commit=False

post = form.save(commit=False)
post.author = request.user  # and assign other fields that are not part of the form
post.save()