[Django]-Django admin filters on remote field via get_list_filter

I don’t have enough reputation to add a comment, so I’ll write here, even if this is not a real answer.

It looks there’s an open ticket on this topic: lookup_allowed fails to consider dynamic list_filter

You can use two different workarounds to quickly solve this problem until it will be fixed upstream:

• in addition to get_list_filter you can define list_filter = ('order__customer',), so that this field’s lookups will always be whitelisted, even if not used (because get_list_filter has precedence)

• you can override lookup_allowed this way:

  def lookup_allowed(self, lookup, *args, **kwargs):
      if lookup == 'order__customer__id__exact':
          return True
      return super(TaskAdmin, self).lookup_allowed(lookup, *args, **kwargs)
  

  this explicitly allows the single lookup that will be used as url param.