Displaying HTML in Django admin

gistfile1.py

from django.utils.safestring import SafeUnicode

"""
When overriding Django admin templates |safe and autoescape off don't work, so do this instead...
"""

# for a foreign key field in the change form, if you want to override the unicode method, use a proxy
class UserProxy(User):
    """
    Using a proxy to present the required formatting: username, email, full name
    """
    class Meta:
        proxy = True

    def _get_mailto_link(self, subject=''):
        return '<a href="mailto:%s?Subject=%s">Email this user</a>' % (self.email, subject)

    def __unicode__(self):
        profile = self.get_profile()
        return SafeUnicode('%s<br /> %s<br /> %s<br />' % (self.username, self._get_mailto_link(), profile.full_name))

# in list display
class PhotoAdmin(admin.ModelAdmin):
    fields = ('title', 'image',)
    list_display = ('title', '_get_thumbnail',)

    def _get_thumbnail(self, obj):
         return u'<img src="%s" />' % obj.admin_thumbnail.url
    _get_thumbnail.allow_tags = True

In Django >= 2.0, you only need to wrap the return value of your field function with mark_safe:

from django.utils.safestring import mark_safe
class ModelAdmin...:
    def your_html_field(self, obj):
        return mark_safe('<image src="%s" />' % obj.image)

allow_tags no longer needed.