models.py

class ItemGroup(models.Model):
    name = models.CharField(max_length=10)
    group_type = models.CharField(max_length=10, default='test')

class Item(models.Model):
    group = models.ForeignKey(ItemGroup,
        related_name='items',
        limit_choices_to={
            'group_type__in': ('test'),
        },
    )
    name = models.CharField(max_length=10)

    class Meta:
        ordering = ('group__group_type', 'name')

tests.py

from django.db.models import Q
from django.test import TestCase

from .models import ItemGroup, Item

class SlicingRegressionTests(TestCase):
    def test_order_from_foreign_key(self):
        """
        Page a query that is ordered by a column from the foreign key.
        """
        group1 = ItemGroup.objects.create(name='group1')
        group1.items.create(name='g1 item1')
        group1.items.create(name='g1 item2')
        group1.items.create(name='g1 item3')
        group2 = ItemGroup.objects.create(name='group2')
        group2.items.create(name='g2 item1')
        group2.items.create(name='g2 item2')
        group3 = ItemGroup.objects.create(name='group3')
        group3.items.create(name='g3 item1')
        group3.items.create(name='g3 item1')

        qs = Item.objects.filter(
            Q(name__icontains='item') 
        )[5:7]


        self.assertEqual(2, len(qs))
        for item in qs:
            self.assertTrue(item.name.startswith('g3'))