Django admin filters on remote field via get_list_filter -

i have 3 models, linked fks in chain this:

class customer(models.model):     name = models.charfield(max_length=100)   class order(models.model):     name = models.charfield(max_length=100)     customer = models.foreignkey(         'customer.customer', on_delete=models.protect)   class task(models.model):     name = models.charfield(max_length=100)     order = models.foreignkey(         'order.order', on_delete=models.protect) 

now, if within taskadmin, use:

list_filter = ('order__customer', )

everything works fine. if go with:

def get_list_filter(self, request):     return ('order__customer', ) 

the page loads, click on possibile customer, bad request (400) error page appears. sounds django bug me, maybe i'm doing wrong here... hints?

i don't have enough reputation add comment, i'll write here, if not real answer.

it looks there's open ticket on topic: lookup_allowed fails consider dynamic list_filter

you can use 2 different workarounds solve problem until fixed upstream:

• in addition get_list_filter can define list_filter = ('order__customer',), field's lookups whitelisted, if not used (because get_list_filter has precedence)

• you can override lookup_allowed 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 single lookup used url param.