Hi,
I'm trying to add a dynamic method to a ModelAdmin so that I can have
automatically generated thumbnail fields for any image by simply adding
'<fieldname>_thumbnail' to the field definitions - which saves a lot of
code when there's a load of admin classes with image fields that need
thumbnails.
e.g.
class ThumbnailMixin(object):
def getattr(self, name):
if name.endswith('_thumbnail'):
# ... generate appropriate thumbnail method and return
return thumbnail_function
else:
raise AttributeError
class ExampleAdmin(models.ModelAdmin, ThumbnailMixin):
fields = ['image_thumbnail', 'image', ...]
This worked fine in Django 1.6/1.7, but it's now failing in 1.8 with a
SystemCheckError (admin.E035 / admin.E108). If I silence the error, the
admin actually works fine, but that feels icky.
The check fails because it checks for the field being on the ExampleAdmin
class, not on an instance - whereas the admin always uses an instance, so
it works.
What's the "right" way to do this in the 1.8 world - I've considered a
custom metaclass, but that feels like overkill for a simple task like this.
Should this even work, and if so is it a bug in the check framework?
Cheers,
Malcolm
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