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Initial values for new items in admin

Author:
RommeDeSerieux
Posted:
September 14, 2009
Language:
Python
Version:
1.1
Score:
1 (after 1 ratings)

Example:

class NewsAdmin(InitialFieldsMixin, admin.ModelAdmin):
    initial = {'author_name': lambda self, request,
               obj, **kwargs: request.user}

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class InitialFieldsMixin(object):

    def get_form(self, request, obj=None, **kwargs):
        form = admin.ModelAdmin.get_form(self, request, obj, **kwargs)
        if not hasattr(self.__class__, 'initial'):
            return form

        old_init = form.__init__
        def new_init(_self, *args, **kwargs):
            if 'instance' not in kwargs:
                for field_name, callback in self.__class__.initial.iteritems():
                    kwargs['initial'][field_name] = callback(self, request,
                                                             obj, **kwargs)
            return old_init(_self, *args, **kwargs)
        form.__init__ = new_init

        return form

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