def image_urls(instance):
default_storage = get_storage_class()()
urls = []
suffix = settings.THUMB_CONF['medium']['suffix']
for a in instance.attachments.all():
if default_storage.exists(get_path(a.media_file.name, suffix)):
url = default_storage.url(
get_path(a.media_file.name, suffix))
else:
url = a.media_file.url
urls.append(url)
return urls
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