Display Thumbnails in Django Admin with Sorl Thumbnail

By default in Django 1.5, admin inline images display just the link to the picture:

In our admin.py we have something like:

class ImageInline(AdminImageMixin, admin.TabularInline):
  model = Image

class ServiceAdmin(AdminImageMixin, admin.ModelAdmin):
  list_display = ('title', 'position', 'get_image_tag')
  inlines      = (ImageInline,)
The thumbnails aren't there, so, let's display them: 
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from django.contrib.admin.widgets import AdminFileWidget
from django.utils.safestring import mark_safe
from django.forms import ModelForm
from sorl.thumbnail import get_thumbnail

class AdminImageWidget(AdminFileWidget):
  def render(self, name, value, attrs=None):
    output = []
    if value and getattr(value, "url", None):
      t = get_thumbnail(value,'80x80')
      output.append('<img src="{}">'.format(t.url))
    output.append(super(AdminFileWidget, self).render(name, value, attrs))
    return mark_safe(u''.join(output))

class ImageForm(ModelForm):
  class Meta:
    model = Image
    widgets = {
      'image': AdminImageWidget,
    }

class ImageInline(AdminImageMixin, admin.TabularInline):
  model = Image
  form  = ImageForm

class ServiceAdmin(AdminImageMixin, admin.ModelAdmin):
  list_display = ('title', 'position', 'get_image_tag')
  inlines      = (ImageInline,)

We override the image widget in order to display images thumbnails, you can change its size in line 10. Result:

Now, if for some reason your non-inline images are not showing its thumbnails like below:

You can also override the image widget with the same class showed above (but this time the form goes inside your admin class instead inline class):

class FooForm(ModelForm):
  class Meta:
    model = Foo
    widgets = {
      'main_image': AdminImageWidget, # same used above
    }

class FooAdmin(AdminImageMixin, admin.ModelAdmin):
  form = FooForm

Result:

That's it, give us your feedback in the comments.

Written on April 8, 2014

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