Django - ImageField文件不显示？ [英] Django - ImageField files not showing up?

问题描述

这是我的models.py：

  class UserImages（models.Model）：
 user = models。 ForeignKey（User）
 photo = models.ImageField（upload_to = get_file_path）
  

我上传图片的视图：

  def uploadImageView（request）：
 if request.method =='POST' 
 form = UploadImageForm（request.POST，request.FILES）
如果form.is_valid（）：
 instance = form.save（commit = False）
 instance.user =请求.user 
 instance.save（）
返回重定向（'/'）
 else：
 form = UploadImageForm（）
 
返回渲染（请求， 'image.html'，{'form'：form}）
  

这是我的视图，显示用户的图像：

  def displayImageView（request）：
 user = request.user 
 img = UserImages。 objects.filter（Q（user__username = user））
 return render（request，displayImage.html，{img：img}）
  

这是我的displayImage.html模板：

  {％load staticfiles％} 
 {％for img％ 
< img src ={％static image.photo.url％}alt =/> 
 {％endfor％} 
  

当我转到加载模板的网址时，它显示四个图像。我记得在测试uploadImageView时，我为浏览器上传了4张图像。 Django保存图像的位置是

  / home / images / static 
  pre> 
 
 
，我去了那个文件夹并删除了两个图像。然后我刷新了模板页面，它仍然显示4个图像而不是两个图像，所以我想我必须从实际的数据库而不是文件夹删除它。然后我做了
  python manage.py shell 
>>>来自app.models import UserImages 
>>>来自django.contrib.auth.models import User 
>>> a = User.objects.get（username ='testUser'）
>>> b = UserImages（user = a）
>>> b 
< UserImages：UserImages对象> 
>>> b.photo 
< ImageFieldFile：None> 
  
 amd，您可以看到，只有一个ImageFieldFile显示给我上传了4张图片的用户。如何才能看到一个？
 
 
 
编辑：
 
 
 
我的UploadImageForm（）只是这样： p> 
 
 
  class UploadImageForm（forms.ModelForm）：
 class Meta：
 model = UserImages 
 fields = ['photo'] 
  
 
 
解决方案
你的问题在这里： / p> 
 
 
 >>> b = UserImages（user = a）
>>> b 
< UserImages：UserImages对象> 
>>> b.photo 
< ImageFieldFile：None> 
  
此代码段正在创建一个新的实例 UserImages ，将用户属性设置为对象 a 。它不是搜索数据库。由于您尚未将任何图像附加到此新实例，因此 b 是无。
 
 
 
要进行搜索，您需要执行此操作：
 >>> b = UserImages.objects.filter（user = a）
  
你也不应该上传任何东西该文件夹由 STATICFILES_DIRS 指向的文件夹，因为此文件夹由django管理，您的文件将被覆盖。我希望 / home / images / static 不在这里列出。
 
 
 
用户上传保存在指向的子目录中到$ code> MEDIA_FILES 并使用 MEDIA_URL 访问。
 
This is my models.py:
class UserImages(models.Model):
    user = models.ForeignKey(User)
    photo = models.ImageField(upload_to=get_file_path)
and this is my view which uploads images:
def uploadImageView(request):
    if request.method == 'POST':
        form = UploadImageForm(request.POST, request.FILES)
        if form.is_valid():
            instance = form.save(commit=False)
            instance.user = request.user
            instance.save()
            return redirect('/')
    else:
        form = UploadImageForm()

    return render(request, 'image.html', {'form': form})
and this is my view which displays user's images:
def displayImageView(request):
    user = request.user
    img = UserImages.objects.filter(Q(user__username=user))
    return render(request, "displayImage.html", {"img": img})
and this is my displayImage.html template:
{% load staticfiles %}
{% for image in img %}
    <img src="{% static image.photo.url %}" alt="" />
{% endfor %}
and when I go to the URL which loads the template, it displays four images. I remember that while testing the uploadImageView, I uploaded 4 images for the viewer. The location Django saves the images was
/home/images/static
and I went to that folder and deleted two images. I then refreshed the template page and it still displayed 4 images rather than two, so then I figured that I had to delete it from the actual database rather than the folder. I then did
python manage.py shell
>>> from app.models import UserImages
>>> from django.contrib.auth.models import User
>>> a = User.objects.get(username='testUser')
>>> b = UserImages(user=a)
>>> b
<UserImages: UserImages object>
>>> b.photo
<ImageFieldFile: None>
amd as you can see, only one ImageFieldFile shows up for the user who I uploaded 4 images for. How come I can only see one?

EDIT:

my UploadImageForm() is just this:
class UploadImageForm(forms.ModelForm):
    class Meta:
        model = UserImages
        fields = ['photo']

解决方案
Your problem is here:
>>> b = UserImages(user=a)
>>> b
<UserImages: UserImages object>
>>> b.photo
<ImageFieldFile: None>
This code snippet is creating a new instance of UserImages, setting the user attribute to the object a. It is not searching the database. Since you haven't attached any images to this new instance, b is None.

To search, you need to do this instead:
>>> b = UserImages.objects.filter(user=a)
You also shouldn't upload anything to the same folder that is pointed to by STATICFILES_DIRS, as this folder is managed by django and your files here will be overwritten. I hope /home/images/static isn't listed here.

User uploads are saved in a subdirectory pointed to by MEDIA_FILES and accessed using MEDIA_URL.

                        
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