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from datetime import datetime
from operator import attrgetter
from django.db.models import Q
from django.test import TestCase
from .models import Article
class OrLookupsTests(TestCase):
@classmethod
def setUpTestData(cls):
cls.a1 = Article.objects.create(
headline="Hello", pub_date=datetime(2005, 11, 27)
).pk
cls.a2 = Article.objects.create(
headline="Goodbye", pub_date=datetime(2005, 11, 28)
).pk
cls.a3 = Article.objects.create(
headline="Hello and goodbye", pub_date=datetime(2005, 11, 29)
).pk
def test_filter_or(self):
self.assertQuerySetEqual(
(
Article.objects.filter(headline__startswith="Hello")
| Article.objects.filter(headline__startswith="Goodbye")
),
["Hello", "Goodbye", "Hello and goodbye"],
attrgetter("headline"),
)
self.assertQuerySetEqual(
Article.objects.filter(headline__contains="Hello")
| Article.objects.filter(headline__contains="bye"),
["Hello", "Goodbye", "Hello and goodbye"],
attrgetter("headline"),
)
self.assertQuerySetEqual(
Article.objects.filter(headline__iexact="Hello")
| Article.objects.filter(headline__contains="ood"),
["Hello", "Goodbye", "Hello and goodbye"],
attrgetter("headline"),
)
self.assertQuerySetEqual(
Article.objects.filter(
Q(headline__startswith="Hello") | Q(headline__startswith="Goodbye")
),
["Hello", "Goodbye", "Hello and goodbye"],
attrgetter("headline"),
)
def test_stages(self):
# You can shorten this syntax with code like the following, which is
# especially useful if building the query in stages:
articles = Article.objects.all()
self.assertQuerySetEqual(
articles.filter(headline__startswith="Hello")
& articles.filter(headline__startswith="Goodbye"),
[],
)
self.assertQuerySetEqual(
articles.filter(headline__startswith="Hello")
& articles.filter(headline__contains="bye"),
["Hello and goodbye"],
attrgetter("headline"),
)
def test_pk_q(self):
self.assertQuerySetEqual(
Article.objects.filter(Q(pk=self.a1) | Q(pk=self.a2)),
["Hello", "Goodbye"],
attrgetter("headline"),
)
self.assertQuerySetEqual(
Article.objects.filter(Q(pk=self.a1) | Q(pk=self.a2) | Q(pk=self.a3)),
["Hello", "Goodbye", "Hello and goodbye"],
attrgetter("headline"),
)
def test_pk_in(self):
self.assertQuerySetEqual(
Article.objects.filter(pk__in=[self.a1, self.a2, self.a3]),
["Hello", "Goodbye", "Hello and goodbye"],
attrgetter("headline"),
)
self.assertQuerySetEqual(
Article.objects.filter(pk__in=(self.a1, self.a2, self.a3)),
["Hello", "Goodbye", "Hello and goodbye"],
attrgetter("headline"),
)
self.assertQuerySetEqual(
Article.objects.filter(pk__in=[self.a1, self.a2, self.a3, 40000]),
["Hello", "Goodbye", "Hello and goodbye"],
attrgetter("headline"),
)
def test_q_repr(self):
or_expr = Q(baz=Article(headline="Foö"))
self.assertEqual(repr(or_expr), "<Q: (AND: ('baz', <Article: Foö>))>")
negated_or = ~Q(baz=Article(headline="Foö"))
self.assertEqual(repr(negated_or), "<Q: (NOT (AND: ('baz', <Article: Foö>)))>")
def test_q_negated(self):
# Q objects can be negated
self.assertQuerySetEqual(
Article.objects.filter(Q(pk=self.a1) | ~Q(pk=self.a2)),
["Hello", "Hello and goodbye"],
attrgetter("headline"),
)
self.assertQuerySetEqual(
Article.objects.filter(~Q(pk=self.a1) & ~Q(pk=self.a2)),
["Hello and goodbye"],
attrgetter("headline"),
)
# This allows for more complex queries than filter() and exclude()
# alone would allow
self.assertQuerySetEqual(
Article.objects.filter(Q(pk=self.a1) & (~Q(pk=self.a2) | Q(pk=self.a3))),
["Hello"],
attrgetter("headline"),
)
def test_complex_filter(self):
# The 'complex_filter' method supports framework features such as
# 'limit_choices_to' which normally take a single dictionary of lookup
# arguments but need to support arbitrary queries via Q objects too.
self.assertQuerySetEqual(
Article.objects.complex_filter({"pk": self.a1}),
["Hello"],
attrgetter("headline"),
)
self.assertQuerySetEqual(
Article.objects.complex_filter(Q(pk=self.a1) | Q(pk=self.a2)),
["Hello", "Goodbye"],
attrgetter("headline"),
)
def test_empty_in(self):
# Passing "in" an empty list returns no results ...
self.assertQuerySetEqual(Article.objects.filter(pk__in=[]), [])
# ... but can return results if we OR it with another query.
self.assertQuerySetEqual(
Article.objects.filter(Q(pk__in=[]) | Q(headline__icontains="goodbye")),
["Goodbye", "Hello and goodbye"],
attrgetter("headline"),
)
def test_q_and(self):
# Q arg objects are ANDed
self.assertQuerySetEqual(
Article.objects.filter(
Q(headline__startswith="Hello"), Q(headline__contains="bye")
),
["Hello and goodbye"],
attrgetter("headline"),
)
# Q arg AND order is irrelevant
self.assertQuerySetEqual(
Article.objects.filter(
Q(headline__contains="bye"), headline__startswith="Hello"
),
["Hello and goodbye"],
attrgetter("headline"),
)
self.assertQuerySetEqual(
Article.objects.filter(
Q(headline__startswith="Hello") & Q(headline__startswith="Goodbye")
),
[],
)
def test_q_exclude(self):
self.assertQuerySetEqual(
Article.objects.exclude(Q(headline__startswith="Hello")),
["Goodbye"],
attrgetter("headline"),
)
def test_other_arg_queries(self):
# Try some arg queries with operations other than filter.
self.assertEqual(
Article.objects.get(
Q(headline__startswith="Hello"), Q(headline__contains="bye")
).headline,
"Hello and goodbye",
)
self.assertEqual(
Article.objects.filter(
Q(headline__startswith="Hello") | Q(headline__contains="bye")
).count(),
3,
)
self.assertSequenceEqual(
Article.objects.filter(
Q(headline__startswith="Hello"), Q(headline__contains="bye")
).values(),
[
{
"headline": "Hello and goodbye",
"id": self.a3,
"pub_date": datetime(2005, 11, 29),
},
],
)
self.assertEqual(
Article.objects.filter(Q(headline__startswith="Hello")).in_bulk(
[self.a1, self.a2]
),
{self.a1: Article.objects.get(pk=self.a1)},
)
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