django sites default

Many 'reusable apps' require django-sites. There is annoying field "publish on" in admin interface, which I can't exclude because it has no default parameter (so the entry will be published nowhere. I tried). The model is described in the 'reusable app' so I don't w开发者_开发百科ant to change it.

How can I get rid of this annoying field?

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Catching the pre_save signal will allow you to inject a default value.