Comments on: Django simple admin ImageField thumbnail

By: Francis

Francis — Thu, 21 Apr 2011 18:17:13 +0000

that last post got didnt keep tabs see: http://djangosnippets.org/snippets/2419/

By: Francis

Francis — Thu, 21 Apr 2011 18:09:58 +0000

Firstly thanks for this script, you got me up and going rather quickly.
I had to tweak it to create / show a thumbnail instead of the full image. this code is a combo of yours and this: http://djangosnippets.org/snippets/955/

from django.contrib.admin.widgets import AdminFileWidget
from django.utils.translation import ugettext as _
from django.utils.safestring import mark_safe
import os
import Image

class AdminImageWidget(AdminFileWidget):
def render(self, name, value, attrs=None):
output = []
if value and getattr(value, “url”, None):

image_url = value.url
file_name=str(value)

# defining the size
size=’100×100′
x, y = [int(x) for x in size.split('x')]

# defining the filename and the miniature filename
filehead, filetail = os.path.split(value.path)
basename, format = os.path.splitext(filetail)
miniature = basename + ‘_’ + size + format
filename = value.path
miniature_filename = os.path.join(filehead, miniature)
filehead, filetail = os.path.split(value.url)
miniature_url = filehead + ‘/’ + miniature

# make sure that the thumbnail is a version of the current original sized image
if os.path.exists(miniature_filename) and os.path.getmtime(filename) > os.path.getmtime(miniature_filename):
os.unlink(miniature_filename)

# if the image wasn’t already resized, resize it
if not os.path.exists(miniature_filename):
image = Image.open(filename)
image.thumbnail([x, y], Image.ANTIALIAS)
try:
image.save(miniature_filename, image.format, quality=100, optimize=1)
except:
image.save(miniature_filename, image.format, quality=100)

output.append(u’ %s ‘ % \
(miniature_url, miniature_url, miniature_filename, _(‘Change:’)))

output.append(super(AdminFileWidget, self).render(name, value, attrs))
return mark_safe(u”.join(output))

By: Greg

Greg — Tue, 16 Nov 2010 13:57:45 +0000

I have several admin.ModelAdmin sub-classes for which I want this behaviour for all ImageField fields so I use formfield_overrides.

class MyAdmin(admin.ModelAdmin):

formfield_overrides = {
models.ImageField: {‘widget’: AdminImageWidget}}

By: john

john — Sun, 15 Aug 2010 18:31:00 +0000

josiano,

it should just be a case of adding the formfield_for_dbfield method to your TabularInline class definition (see Daniel’s comment).

John

By: josiano

josiano — Sun, 15 Aug 2010 17:59:22 +0000

hi
how could I do the same for TabularInline objects ?

cheers,
_j

By: Daniel Jewett

Daniel Jewett — Wed, 16 Jun 2010 19:37:10 +0000

Ok, I see. I just included the form field override in my inline class definition and it worked!
Thanks!

By: Daniel Jewett

Daniel Jewett — Wed, 16 Jun 2010 19:00:36 +0000

Hello,
John is it?
Thanks for the widget. it works beautifully. I’m wondering how I can get the widget to render in inline forms.

I have an ItemImage class with a FK relationship to Items.

It would be great if the widget would display images in the set of ItemImage change forms included on the Item change form.

Thanks,
Dan J.

By: Phu Le

Phu Le — Thu, 20 May 2010 09:20:43 +0000

Thanks for this snippet!

By: Stephen Wolff

Stephen Wolff — Sun, 25 Apr 2010 07:07:28 +0000

Hey John, nice to see you in Django land…

Here’s a one liner that does the same job as your try/catch:

request = kwargs.pop(‘request’, None)

By: john

john — Tue, 20 Apr 2010 09:52:52 +0000

The code ultimately needs to be used inside your apps admin.py file – when you register your models with the admin.

The AdminImageWidget class itself can go wherever you want it and can be imported into your admin.py file(s) as needed.