blocks|key|1477360|text|从理论上讲，您还可以在模型定义中使用函数。但我不知道这是不是一个好的做法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1477361|class+Image(model.Models):
++++image+=+....

++++def+getImage(self):
++++++++if+not+self.image:
++++++++++++#+depending+on+your+template
++++++++++++return+default_path+or+default_image_object|code-block|syntax|javascript|1477362|然后在模板中|1477363|+++<img+src="img.getImage"+/>|1477364|这为您的未来提供了极大的灵活性……|1477365|我正在使用sorl生成缩略图，并取得了巨大的成功|1477366|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

You could theoretically also use a function within your model definition. But I dont know whether this is good practice:

<pre><code>class Image(model.Models):
 image = ....

 def getImage(self):
 if not self.image:
 # depending on your template
 return default_path or default_image_object
</code></pre>

and then within a template

<pre><code> &lt;img src="img.getImage" /&gt;
</code></pre>

This gives you a great deal of flexibility for the future...

I'm using sorl for thumbnails generation with great success

blocks|key|1262704|text|您可以在您的视图中尝试以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1262705|{%25+ifequal+object.image+None+%25}
++++<img+src="DEFAULT_IMAGE"+/>
{%25+else+%25}
++++display+image
{%25+endifequal+%25}|code-block|syntax|javascript|1262706|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

you could try this in your view:

<pre><code>{% ifequal object.image None %}
 &lt;img src="DEFAULT_IMAGE" /&gt;
{% else %}
 display image
{% endifequal %}
</code></pre>

blocks|key|1262795|text|您可以使用'default‘参数提供初始值。如果已经有一个镜像，并且您想要将其设置为默认值(而不是删除它)，您可以尝试如下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1262796|DEFAULT+=+'img/default.jpg'

class+Example(models.Model):
++++image+=+models.ImageField(default=DEFAULT)

++++def+set_image_to_default(self):
++++++++self.image.delete(save=False)++#+delete+old+image+file
++++++++self.image+=+DEFAULT
++++++++self.save()|code-block|syntax|javascript|1262797|然后，如果您喜欢默认设置，则可以使用set_image_to_default()而不是image.delete()。|offset|length|style|CODE|1262798|entityMap^0|0|0|I|M|17|E|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]|$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

You can provide an initial value with the 'default' parameter.
If there is already an image and you want to set it to default (instead of deleting it), you can try something like this:

<pre><code>DEFAULT = 'img/default.jpg'

class Example(models.Model):
 image = models.ImageField(default=DEFAULT)

 def set_image_to_default(self):
 self.image.delete(save=False) # delete old image file
 self.image = DEFAULT
 self.save()
</code></pre>

Then you can use <code>set_image_to_default()</code> instead of <code>image.delete()</code>, if you prefer the default.

blocks|key|1477458|text|在models.py中|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1477459|image+=+models.ImageField(upload_to='profile_pic',+default='default.jpg')|code-block|syntax|javascript|1477460|在settings.py中添加以下内容：|1477461|MEDIA_ROOT+=+os.path.join(BASE_DIR,+'media')
MEDIA_URL+=+'/media/'|1477462|现在，手动将名为“default”的映像添加到介质文件夹中。|1477463|entityMap^0|0|0|0|0|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]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

In models.py

<pre><code>image = models.ImageField(upload_to='profile_pic', default='default.jpg')
</code></pre>

In settings.py add this:

<pre><code>MEDIA_ROOT = os.path.join(BASE_DIR, 'media')
MEDIA_URL = '/media/'
</code></pre>

Now, 
Manually, add an image with a name ''default' into the media folder.

I'm using an <code>ImageField</code> to store profile pictures on my model.

How do I set it to return a default image if no image is defined?

Default image for ImageField in Django's ORM

我正在使用ImageField在我的模型上存储头像。如果没有定义图像，如何设置返回默认图像？

问Django的ORM中ImageField的默认图像
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