blocks|key|2928344|text|试着做这样的事情：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2928345|from+os+import+rename
class+Banner(models.Model):
++++name++++++++=+models.CharField(max_length+=+128)
++++link++++++++=+models.TextField(max_length+=+450)
++++image+++++++=+models.ImageField(upload_to+=+'banner_images')

++++def+save(self):
++++++++++++super(Banner,+self).save()
++++++++++++new_filename+=+<insert+code+here+to+change+name>
++++++++++++self.image.name+=+new_filename
++++++++++++rename(static_path%2B'banner_images/'%2Bself.image,+static_path%2B'banner_images/'%2Bnew_filename)
++++++++++++super(Banner,+self).save()|code-block|syntax|javascript|2928346|我不确定是否需要调用超级(Banner).save()两次。可能需要第一个文件来保存文件，第二个文件可能需要更新DB记录。|2928347|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 something like this:

<pre><code>from os import rename
class Banner(models.Model):
 name = models.CharField(max_length = 128)
 link = models.TextField(max_length = 450)
 image = models.ImageField(upload_to = 'banner_images')

 def save(self):
 super(Banner, self).save()
 new_filename = &lt;insert code here to change name&gt;
 self.image.name = new_filename
 rename(static_path+'banner_images/'+self.image, static_path+'banner_images/'+new_filename)
 super(Banner, self).save()
</code></pre>

I'm not sure if the super(Banner, self).save() called is required twice or not. The 1st might be needed to save the file, and the 2nd one to update the DB record.

blocks|key|3284681|text|1)+upload_to可以是可调用的，在保存时可以修改它的文件名(文档)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3284682|2)参见https://code.djangoproject.com/ticket/6792，你必须自己删除它，|3284683|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.djangoproject.com/en/dev/ref/models/fields/#django.db.models.FileField.upload_to|1|https://code.djangoproject.com/ticket/6792^0|Y|2|0|0|4|16|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

1) upload_to can be a callable, on save you can modify it's filename (<a href="https://docs.djangoproject.com/en/dev/ref/models/fields/#django.db.models.FileField.upload_to" rel="nofollow">docs</a>)

2) see <a href="https://code.djangoproject.com/ticket/6792" rel="nofollow">https://code.djangoproject.com/ticket/6792</a>, you have to delete it yourself,

blocks|key|1731563|text|由于我遇到了与通过管理节省图像有关的问题，所以我得到了以下解决方案，它回答了我所有的查询.|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1731564|首先，我发现尽管admin保留了原始的文件名，但是如果同名的文件已经存在，它仍然会将一个计数作为后缀来防止重复的文件名.例如，如果上传相同的文件，它将存储为图像、image_2、image_3等.|unordered-list-item|1731565|第二，在通过admin更改图像时，它没有删除原始文件。为此，我用admin.py编写了以下代码。它做的很好..。|1731566|代码：|offset|length|style|BOLD|1731567|class+BannerAdmin(admin.ModelAdmin):

++++def+save_model(self,+request,+obj,+form,+change):
++++++++#Remove+the+previous+file+if+the+object+is+not+new+
++++++++#and+new+file+supplied.++++++++
++++++++if+obj.id+!=+None+and+len(request.FILES)+>+0:

++++++++++++import+os
++++++++++++old_obj+=+m.Banner.objects.get(id+=+obj.id)
++++++++++++os.remove(old_obj.image.path)|code-block|syntax|javascript|1731568|如果你有类似的问题，希望这对你有帮助。|1731569|entityMap^0|0|0|0|0|3|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|W|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|X|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|Y|8|@$I|Z|J|10|K|L]]|9|@]|A|$]]|$1|M|3|N|5|O|7|11|8|@]|9|@]|A|$P|Q]]|$1|R|3|S|5|6|7|12|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|U|$]]

Since I was having problem related to savings of image through admin I got following solution which answers all my queries...

<ul>
<li>First I found that even though admin keeps the original file name, if the file with same name already exists, it keeps on appending a count as a suffix to prevent duplicate file name... for example, if same file is uploaded it is stored as image, image_2, image_3 etc... </li>
<li>Second, while changing image through admin, it was not removing the original file. For that I wrote following code in admin.py. And it does the job well... </li>
</ul>

Code:

<pre><code>class BannerAdmin(admin.ModelAdmin):

 def save_model(self, request, obj, form, change):
 #Remove the previous file if the object is not new 
 #and new file supplied. 
 if obj.id != None and len(request.FILES) &gt; 0:

 import os
 old_obj = m.Banner.objects.get(id = obj.id)
 os.remove(old_obj.image.path)
</code></pre>

Hope this helps you if you have got the similar problem.

I have a following Banner class. Which is editable by admin.

<pre><code>class Banner(models.Model):
 name = models.CharField(max_length = 128)
 link = models.TextField(max_length = 450)
 image = models.ImageField(upload_to = 'banner_images')
</code></pre>

There are two problems.

<ol>
<li>When saving image it is saved with original file name. I would like to change it with some unique name so that is not clashed when image with the same name is uploaded again in the specified directory.</li>
<li>While updating the image, the first image file must be deleted. It is not happening...</li>
</ol>

Any suggestion will be helpful. Thanks in advance.

Image field related problems while using in django admin

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一个跟随班纳班。它可以由管理员编辑。class Banner(models.Model):    name        = models.CharField(max_length = 128)    link        = models.TextField(max_length = 450)    image...

问django管理中使用时与图像字段相关的问题
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