django/tests/xor_lookups/tests.py

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

from .models import Number


class XorLookupsTests(TestCase):
    @classmethod
    def setUpTestData(cls):
        cls.numbers = [Number.objects.create(num=i) for i in range(10)]

    def test_filter(self):
        self.assertCountEqual(
            Number.objects.filter(num__lte=7) ^ Number.objects.filter(num__gte=3),
            self.numbers[:3] + self.numbers[8:],
        )
        self.assertCountEqual(
            Number.objects.filter(Q(num__lte=7) ^ Q(num__gte=3)),
            self.numbers[:3] + self.numbers[8:],
        )

    def test_filter_multiple(self):
        qs = Number.objects.filter(
            Q(num__gte=1)
            ^ Q(num__gte=3)
            ^ Q(num__gte=5)
            ^ Q(num__gte=7)
            ^ Q(num__gte=9)
        )
        self.assertCountEqual(
            qs,
            self.numbers[1:3] + self.numbers[5:7] + self.numbers[9:],
        )
        self.assertCountEqual(
            qs.values_list("num", flat=True),
            [
                i
                for i in range(10)
                if (i >= 1) ^ (i >= 3) ^ (i >= 5) ^ (i >= 7) ^ (i >= 9)
            ],
        )

    def test_filter_negated(self):
        self.assertCountEqual(
            Number.objects.filter(Q(num__lte=7) ^ ~Q(num__lt=3)),
            self.numbers[:3] + self.numbers[8:],
        )
        self.assertCountEqual(
            Number.objects.filter(~Q(num__gt=7) ^ ~Q(num__lt=3)),
            self.numbers[:3] + self.numbers[8:],
        )
        self.assertCountEqual(
            Number.objects.filter(Q(num__lte=7) ^ ~Q(num__lt=3) ^ Q(num__lte=1)),
            [self.numbers[2]] + self.numbers[8:],
        )
        self.assertCountEqual(
            Number.objects.filter(~(Q(num__lte=7) ^ ~Q(num__lt=3) ^ Q(num__lte=1))),
            self.numbers[:2] + self.numbers[3:8],
        )

    def test_exclude(self):
        self.assertCountEqual(
            Number.objects.exclude(Q(num__lte=7) ^ Q(num__gte=3)),
            self.numbers[3:8],
        )

    def test_stages(self):
        numbers = Number.objects.all()
        self.assertSequenceEqual(
            numbers.filter(num__gte=0) ^ numbers.filter(num__lte=11),
            [],
        )
        self.assertSequenceEqual(
            numbers.filter(num__gt=0) ^ numbers.filter(num__lt=11),
            [self.numbers[0]],
        )

    def test_pk_q(self):
        self.assertCountEqual(
            Number.objects.filter(Q(pk=self.numbers[0].pk) ^ Q(pk=self.numbers[1].pk)),
            self.numbers[:2],
        )

    def test_empty_in(self):
        self.assertCountEqual(
            Number.objects.filter(Q(pk__in=[]) ^ Q(num__gte=5)),
            self.numbers[5:],
        )