blocks|key|1244447|text|您必须手动删除旧图像。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1244448|图像的绝对路径存储在your_image_field.path中。所以你会做类似这样的事情：|offset|length|style|CODE|1244449|os.remove(your_image_field.path)|code-block|syntax|javascript|1244450|但是，为了方便起见，您可以使用关联的FieldFile对象，它可以方便地访问底层文件，并提供一些方便的方法。请参阅http://docs.djangoproject.com/en/dev/ref/models/fields/#filefield-and-fieldfile|1244451|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.djangoproject.com/en/dev/ref/models/fields/#filefield-and-fieldfile^0|0|A|L|0|0|1L|27|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|9|@$D|12|E|13|1|14]]|A|$]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

You'll have to delete the old image manually.
The absolute path to the image is stored in <code>your_image_field.path</code>. So you'd do something like:
<pre><code>os.remove(your_image_field.path)
</code></pre>
But, as a convenience, you can use the associated FieldFile object, which gives easy access to the underlying file, as well as providing a few convenience methods. See <a href="http://docs.djangoproject.com/en/dev/ref/models/fields/#filefield-and-fieldfile" rel="nofollow noreferrer">http://docs.djangoproject.com/en/dev/ref/models/fields/#filefield-and-fieldfile</a>

blocks|key|1029574|text|在模型中使用此自定义保存方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1029575|def+save(self,+*args,+**kwargs):
++++try:
++++++++this+=+MyModelName.objects.get(id=self.id)
++++++++if+this.MyImageFieldName+!=+self.MyImageFieldName:
++++++++++++this.MyImageFieldName.delete()
++++except:+pass
++++super(MyModelName,+self).save(*args,+**kwargs)|code-block|syntax|javascript|1029576|它在我的网站上对我很有效。这个问题也困扰着我，我不想在一开始就写一个清理脚本，而不是好的记账。如果有任何问题，请告诉我。|1029577|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Use this custom save method in your model:

<pre><code>def save(self, *args, **kwargs):
 try:
 this = MyModelName.objects.get(id=self.id)
 if this.MyImageFieldName != self.MyImageFieldName:
 this.MyImageFieldName.delete()
 except: pass
 super(MyModelName, self).save(*args, **kwargs)
</code></pre>

It works for me on my site. This problem was bothering me as well and I didn't want to make a cleanup script instead over good bookkeeping in the first place. Let me know if there are any problems with it.

blocks|key|1029584|text|使用django-cleanup|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1029585|pip+install+django-cleanup|code-block|syntax|javascript|1029586|settings.py|1029587|INSTALLED_APPS+=+(
++++...
++++'django_cleanup.apps.CleanupConfig',+#+should+be+placed+after+your+apps

)|1029588|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/un1t/django-cleanup^0|2|E|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Use <a href="https://github.com/un1t/django-cleanup" rel="noreferrer">django-cleanup</a>
<pre><code>pip install django-cleanup
</code></pre>
settings.py
<pre><code>INSTALLED_APPS = (
 ...
 'django_cleanup.apps.CleanupConfig', # should be placed after your apps

)
</code></pre>

blocks|key|1029641|text|在更新模型实例之前，可以使用FileField对象的delete方法。例如，如果FileField或ImageField的名称为photo，而模型实例为profile，则以下操作将从磁盘中移除该文件|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1029642|profile.photo.delete(False)|code-block|syntax|javascript|1029643|为了得到更多的说明，这里是django文档|1029644|https://docs.djangoproject.com/en/1.11/ref/models/fields/#django.db.models.fields.files.FieldFile.delete|1029645|entityMap|0|LINK|mutability|MUTABLE|url^0|E|9|14|9|1E|A|1S|5|24|7|0|0|0|0|2W|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|16|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|17|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|18|8|@]|D|@$9|19|A|1A|1|1B]]|E|$]]|$1|O|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|N]]]]

Before updating the model instance, you can use the delete method of <code>FileField</code> object. For example, if the <code>FileField</code> or <code>ImageField</code> is named as <code>photo</code> and your model instance is <code>profile</code>, then the following will remove the file from disk

<pre><code>profile.photo.delete(False)
</code></pre>

For more clarification, here is the django doc

<a href="https://docs.djangoproject.com/en/1.11/ref/models/fields/#django.db.models.fields.files.FieldFile.delete" rel="noreferrer">https://docs.djangoproject.com/en/1.11/ref/models/fields/#django.db.models.fields.files.FieldFile.delete</a>

blocks|key|1244631|text|您可以在模型中定义pre_save接收器：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1244632|@receiver(models.signals.pre_save,+sender=UserAccount)
def+delete_file_on_change_extension(sender,+instance,+**kwargs):
++++if+instance.pk:
++++++++try:
++++++++++++old_avatar+=+UserAccount.objects.get(pk=instance.pk).avatar
++++++++except+UserAccount.DoesNotExist:
++++++++++++return
++++++++else:
++++++++++++new_avatar+=+instance.avatar
++++++++++++if+old_avatar+and+old_avatar.url+!=+new_avatar.url:
++++++++++++++++old_avatar.delete(save=False)|code-block|syntax|javascript|1244633|我的头像对每个人都有唯一的url，就像"avatars/ceb47779-8833-4719-8711-6f4e5cabb2b2.png".如果用户上传具有不同扩展名的新图像，例如jpg，则在使用url+"avatars/ceb47779-8833-4719-8711-6f4e5cabb2b2.jpg“(在这种情况下)保存新图像之前，delete_file_on_change_extension接收器会删除旧图像。如果用户上传具有相同扩展名的新镜像，django会覆盖存储(磁盘)上的旧镜像，因为镜像路径相同。这在亚马逊网络服务S3+django-storage上运行得很好。|1244634|entityMap^0|9|8|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

You can define <code>pre_save</code> reciever in models:

<pre><code>@receiver(models.signals.pre_save, sender=UserAccount)
def delete_file_on_change_extension(sender, instance, **kwargs):
 if instance.pk:
 try:
 old_avatar = UserAccount.objects.get(pk=instance.pk).avatar
 except UserAccount.DoesNotExist:
 return
 else:
 new_avatar = instance.avatar
 if old_avatar and old_avatar.url != new_avatar.url:
 old_avatar.delete(save=False)
</code></pre>

My avatrs has unique url for each person like "avatars/ceb47779-8833-4719-8711-6f4e5cabb2b2.png". If user upload new image with different extension like jpg, delete_file_on_change_extension reciever remove old image, before save new with url "avatars/ceb47779-8833-4719-8711-6f4e5cabb2b2.jpg" (in this case). If user uploads new image with same extension django overwrite old image on storage (disk), because images paths are the same.
This works fine with AWS S3 django-storage.

blocks|key|1029797|text|完成了克里斯·劳勒的回答，尝试了一下，并取得了成效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1029798|from+YOURAPP.settings+import+BASE_DIR

try:
++++os.remove(BASE_DIR+%2B+user.userprofile.avatarURL)
except+Exception+as+e:
++++pass+|code-block|syntax|javascript|1029799|该URL的模式为/media/mypicture.jpg|offset|length|style|CODE|1029800|entityMap^0|0|0|8|K|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Completing Chris Lawlor's answer, tried this and works.

<pre><code>from YOURAPP.settings import BASE_DIR

try:
 os.remove(BASE_DIR + user.userprofile.avatarURL)
except Exception as e:
 pass 
</code></pre>

The URL has a pattern of <code>/media/mypicture.jpg</code>

blocks|key|1244789|text|试一试，即使旧文件被删除也能正常工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1244790|def+logo_file(instance,+filename):

++++try:
++++++++this+=+business.objects.get(id=instance.id)
++++++++if+this.logo+is+not+None:
++++++++++++path+=+"%25s"+%25+(this.logo)
++++++++++++os.remove(path)
++++finally:
++++++++pass..|code-block|syntax|javascript|1244791|代码将工作，即使没有“尝试..最后”，但它会产生问题，如果文件被意外删除。更改:移动"try“内的模型匹配，这样它就不会在用户注册时抛出任何错误，让我知道是否有任何问题。|1244792|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

try this, it will work even if old file is deleted

<pre><code>def logo_file(instance, filename):

 try:
 this = business.objects.get(id=instance.id)
 if this.logo is not None:
 path = "%s" % (this.logo)
 os.remove(path)
 finally:
 pass..
</code></pre>

code will work even without "try .. finally" but it will generate problem if file was accidently deleted.
changed: move model matching inside "try" so it will not throw any error at user signup
Let me know if there are any problems.

blocks|key|1029951|text|我所做的是保存到旧图像的路径，如果表单有效，我将删除旧图像。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1029952|if+request.method+==+'POST':
++++++++old_image+=+""
++++++++if+request.user.profile.profile_picture:
++++++++++++old_image+=+request.user.profile.profile_picture.path
++++++++form+=+UpdateProfileForm(request.POST,request.FILES,instance+=+profile)
++++++++if+form.is_valid():
++++++++++++if+os.path.exists(old_image):
++++++++++++++++os.remove(old_image)
++++++++form.save()|code-block|syntax|javascript|1029953|它有点乱，但你没有安装第三方或任何东西|1029954|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

What I did is saving the path to the old image and if form is valid I would delete the old one.
<pre><code>if request.method == 'POST':
 old_image = &quot;&quot;
 if request.user.profile.profile_picture:
 old_image = request.user.profile.profile_picture.path
 form = UpdateProfileForm(request.POST,request.FILES,instance = profile)
 if form.is_valid():
 if os.path.exists(old_image):
 os.remove(old_image)
 form.save()
</code></pre>
It is a little messy , but you do not install third parties or anythin

I'm using Django to create a stock photo site, I have an ImageField in my model, the problem is that when the user updates the image field, the original image file isn't deleted from the hard disk.

How can I delete the old images after an update?

How to delete old image when update ImageField?

Django

我正在使用Django创建一个库存照片网站，我的模型中有一个ImageField，问题是当用户更新图像字段时，原始图像文件不会从硬盘中删除。更新后如何删除旧镜像？

问如何在更新ImageField时删除旧镜像？
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