Possible to turn on by default on all admin

[zehawki]

Adding this to each admin field one by one is cumbersome... Is there some way to add by default for fields that are present in all models, eg created_at, modified_at (in my case).

[silentsokolov]

You can override __init__ method of ModelAdmin and add something like this:

def __init__(self, *arg, **kwarg):
    super().__init__(self, *arg, **kwarg)
    fields = ['created_at', 'modified_at']

    def _default_range(self, request)
        return 0

    for f in fields:
        setattr(self.__class__, f'get_rangefilter_{f}_default', _default_range)