How to override the queryset giving the filters in list_filter?

Question

Given the following models

class AnotherModel(models.Model):
    n = models.IntegerField()

class MyModel(models.Model):
    somefield = models.ForeignKey(An         


        

Answer 1

I found another method similar to @seddonym, but doesn't mess with the caching. It is based on this Django code, but uses undocumented method field_choices, which can be subject to change in the future Django releases. The code for @seddonym's case would be:

from django.contrib.admin.filters import RelatedFieldListFilter

class SpeciesFilter(RelatedFieldListFilter):
    def field_choices(self, field, request, model_admin):
        return field.get_choices(include_blank=False, limit_choices_to={'name': 'Tarantula'})

Or in my case the working code is:

from django.contrib.admin.filters import RelatedFieldListFilter

class UnitFilter(RelatedFieldListFilter):
    def field_choices(self, field, request, model_admin):
        return field.get_choices(include_blank=False, limit_choices_to={'pk__in': request.user.administrated_units.all()})