mirror of
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264 lines
8.4 KiB
Python
264 lines
8.4 KiB
Python
from django.core.exceptions import FieldError
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from django.db.models import (
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BooleanField,
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Exists,
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ExpressionWrapper,
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F,
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OuterRef,
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Q,
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Value,
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)
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from django.db.models.expressions import NegatedExpression, RawSQL
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from django.db.models.functions import Lower
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from django.db.models.sql.where import NothingNode
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from django.test import SimpleTestCase, TestCase
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from .models import Tag
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class QTests(SimpleTestCase):
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def test_combine_and_empty(self):
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q = Q(x=1)
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self.assertEqual(q & Q(), q)
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self.assertEqual(Q() & q, q)
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q = Q(x__in={}.keys())
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self.assertEqual(q & Q(), q)
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self.assertEqual(Q() & q, q)
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def test_combine_and_both_empty(self):
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self.assertEqual(Q() & Q(), Q())
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def test_combine_or_empty(self):
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q = Q(x=1)
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self.assertEqual(q | Q(), q)
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self.assertEqual(Q() | q, q)
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q = Q(x__in={}.keys())
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self.assertEqual(q | Q(), q)
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self.assertEqual(Q() | q, q)
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def test_combine_xor_empty(self):
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q = Q(x=1)
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self.assertEqual(q ^ Q(), q)
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self.assertEqual(Q() ^ q, q)
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q = Q(x__in={}.keys())
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self.assertEqual(q ^ Q(), q)
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self.assertEqual(Q() ^ q, q)
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def test_combine_empty_copy(self):
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base_q = Q(x=1)
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tests = [
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base_q | Q(),
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Q() | base_q,
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base_q & Q(),
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Q() & base_q,
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base_q ^ Q(),
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Q() ^ base_q,
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]
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for i, q in enumerate(tests):
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with self.subTest(i=i):
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self.assertEqual(q, base_q)
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self.assertIsNot(q, base_q)
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def test_combine_or_both_empty(self):
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self.assertEqual(Q() | Q(), Q())
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def test_combine_xor_both_empty(self):
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self.assertEqual(Q() ^ Q(), Q())
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def test_combine_not_q_object(self):
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obj = object()
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q = Q(x=1)
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with self.assertRaisesMessage(TypeError, str(obj)):
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q | obj
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with self.assertRaisesMessage(TypeError, str(obj)):
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q & obj
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with self.assertRaisesMessage(TypeError, str(obj)):
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q ^ obj
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def test_combine_negated_boolean_expression(self):
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tagged = Tag.objects.filter(category=OuterRef("pk"))
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tests = [
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Q() & ~Exists(tagged),
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Q() | ~Exists(tagged),
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Q() ^ ~Exists(tagged),
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]
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for q in tests:
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with self.subTest(q=q):
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self.assertIsInstance(q, NegatedExpression)
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def test_deconstruct(self):
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q = Q(price__gt=F("discounted_price"))
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path, args, kwargs = q.deconstruct()
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self.assertEqual(path, "django.db.models.Q")
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self.assertEqual(args, (("price__gt", F("discounted_price")),))
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self.assertEqual(kwargs, {})
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def test_deconstruct_negated(self):
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q = ~Q(price__gt=F("discounted_price"))
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path, args, kwargs = q.deconstruct()
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self.assertEqual(args, (("price__gt", F("discounted_price")),))
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self.assertEqual(kwargs, {"_negated": True})
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def test_deconstruct_or(self):
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q1 = Q(price__gt=F("discounted_price"))
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q2 = Q(price=F("discounted_price"))
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q = q1 | q2
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path, args, kwargs = q.deconstruct()
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self.assertEqual(
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args,
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(
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("price__gt", F("discounted_price")),
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("price", F("discounted_price")),
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),
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)
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self.assertEqual(kwargs, {"_connector": Q.OR})
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def test_deconstruct_xor(self):
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q1 = Q(price__gt=F("discounted_price"))
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q2 = Q(price=F("discounted_price"))
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q = q1 ^ q2
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path, args, kwargs = q.deconstruct()
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self.assertEqual(
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args,
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(
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("price__gt", F("discounted_price")),
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("price", F("discounted_price")),
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),
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)
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self.assertEqual(kwargs, {"_connector": Q.XOR})
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def test_deconstruct_and(self):
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q1 = Q(price__gt=F("discounted_price"))
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q2 = Q(price=F("discounted_price"))
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q = q1 & q2
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path, args, kwargs = q.deconstruct()
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self.assertEqual(
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args,
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(
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("price__gt", F("discounted_price")),
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("price", F("discounted_price")),
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),
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)
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self.assertEqual(kwargs, {})
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def test_deconstruct_multiple_kwargs(self):
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q = Q(price__gt=F("discounted_price"), price=F("discounted_price"))
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path, args, kwargs = q.deconstruct()
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self.assertEqual(
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args,
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(
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("price", F("discounted_price")),
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("price__gt", F("discounted_price")),
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),
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)
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self.assertEqual(kwargs, {})
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def test_deconstruct_nested(self):
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q = Q(Q(price__gt=F("discounted_price")))
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path, args, kwargs = q.deconstruct()
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self.assertEqual(args, (Q(price__gt=F("discounted_price")),))
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self.assertEqual(kwargs, {})
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def test_deconstruct_boolean_expression(self):
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expr = RawSQL("1 = 1", BooleanField())
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q = Q(expr)
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_, args, kwargs = q.deconstruct()
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self.assertEqual(args, (expr,))
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self.assertEqual(kwargs, {})
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def test_reconstruct(self):
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q = Q(price__gt=F("discounted_price"))
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path, args, kwargs = q.deconstruct()
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self.assertEqual(Q(*args, **kwargs), q)
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def test_reconstruct_negated(self):
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q = ~Q(price__gt=F("discounted_price"))
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path, args, kwargs = q.deconstruct()
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self.assertEqual(Q(*args, **kwargs), q)
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def test_reconstruct_or(self):
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q1 = Q(price__gt=F("discounted_price"))
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q2 = Q(price=F("discounted_price"))
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q = q1 | q2
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path, args, kwargs = q.deconstruct()
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self.assertEqual(Q(*args, **kwargs), q)
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def test_reconstruct_xor(self):
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q1 = Q(price__gt=F("discounted_price"))
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q2 = Q(price=F("discounted_price"))
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q = q1 ^ q2
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path, args, kwargs = q.deconstruct()
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self.assertEqual(Q(*args, **kwargs), q)
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def test_reconstruct_and(self):
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q1 = Q(price__gt=F("discounted_price"))
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q2 = Q(price=F("discounted_price"))
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q = q1 & q2
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path, args, kwargs = q.deconstruct()
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self.assertEqual(Q(*args, **kwargs), q)
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def test_flatten(self):
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q = Q()
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self.assertEqual(list(q.flatten()), [q])
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q = Q(NothingNode())
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self.assertEqual(list(q.flatten()), [q, q.children[0]])
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q = Q(
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ExpressionWrapper(
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Q(RawSQL("id = 0", params=(), output_field=BooleanField()))
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| Q(price=Value("4.55"))
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| Q(name=Lower("category")),
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output_field=BooleanField(),
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)
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)
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flatten = list(q.flatten())
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self.assertEqual(len(flatten), 7)
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def test_create_helper(self):
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items = [("a", 1), ("b", 2), ("c", 3)]
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for connector in [Q.AND, Q.OR, Q.XOR]:
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with self.subTest(connector=connector):
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self.assertEqual(
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Q.create(items, connector=connector),
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Q(*items, _connector=connector),
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)
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class QCheckTests(TestCase):
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def test_basic(self):
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q = Q(price__gt=20)
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self.assertIs(q.check({"price": 30}), True)
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self.assertIs(q.check({"price": 10}), False)
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def test_expression(self):
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q = Q(name="test")
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self.assertIs(q.check({"name": Lower(Value("TeSt"))}), True)
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self.assertIs(q.check({"name": Value("other")}), False)
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def test_missing_field(self):
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q = Q(description__startswith="prefix")
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msg = "Cannot resolve keyword 'description' into field."
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with self.assertRaisesMessage(FieldError, msg):
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q.check({"name": "test"})
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def test_boolean_expression(self):
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q = Q(ExpressionWrapper(Q(price__gt=20), output_field=BooleanField()))
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self.assertIs(q.check({"price": 25}), True)
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self.assertIs(q.check({"price": Value(10)}), False)
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def test_rawsql(self):
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"""
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RawSQL expressions cause a database error because "price" cannot be
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replaced by its value. In this case, Q.check() logs a warning and
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return True.
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"""
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q = Q(RawSQL("price > %s", params=(20,), output_field=BooleanField()))
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with self.assertLogs("django.db.models", "WARNING") as cm:
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self.assertIs(q.check({"price": 10}), True)
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self.assertIn(
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f"Got a database error calling check() on {q!r}: ",
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cm.records[0].getMessage(),
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)
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