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83 lines
3.1 KiB
Python
83 lines
3.1 KiB
Python
from django.db.models import F, Sum
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from django.test import TestCase
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from .models import Company, Employee
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class ValuesExpressionsTests(TestCase):
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@classmethod
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def setUpTestData(cls):
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Company.objects.create(
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name="Example Inc.",
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num_employees=2300,
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num_chairs=5,
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ceo=Employee.objects.create(firstname="Joe", lastname="Smith", salary=10),
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)
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Company.objects.create(
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name="Foobar Ltd.",
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num_employees=3,
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num_chairs=4,
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ceo=Employee.objects.create(firstname="Frank", lastname="Meyer", salary=20),
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)
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Company.objects.create(
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name="Test GmbH",
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num_employees=32,
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num_chairs=1,
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ceo=Employee.objects.create(
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firstname="Max", lastname="Mustermann", salary=30
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),
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)
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def test_values_expression(self):
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self.assertSequenceEqual(
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Company.objects.values(salary=F("ceo__salary")),
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[{"salary": 10}, {"salary": 20}, {"salary": 30}],
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)
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def test_values_expression_alias_sql_injection(self):
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crafted_alias = """injected_name" from "expressions_company"; --"""
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msg = (
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"Column aliases cannot contain whitespace characters, quotation marks, "
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"semicolons, or SQL comments."
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)
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with self.assertRaisesMessage(ValueError, msg):
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Company.objects.values(**{crafted_alias: F("ceo__salary")})
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def test_values_expression_group_by(self):
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# values() applies annotate() first, so values selected are grouped by
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# id, not firstname.
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Employee.objects.create(firstname="Joe", lastname="Jones", salary=2)
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joes = Employee.objects.filter(firstname="Joe")
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self.assertSequenceEqual(
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joes.values("firstname", sum_salary=Sum("salary")).order_by("sum_salary"),
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[
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{"firstname": "Joe", "sum_salary": 2},
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{"firstname": "Joe", "sum_salary": 10},
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],
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)
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self.assertSequenceEqual(
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joes.values("firstname").annotate(sum_salary=Sum("salary")),
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[{"firstname": "Joe", "sum_salary": 12}],
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)
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def test_chained_values_with_expression(self):
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Employee.objects.create(firstname="Joe", lastname="Jones", salary=2)
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joes = Employee.objects.filter(firstname="Joe").values("firstname")
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self.assertSequenceEqual(
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joes.values("firstname", sum_salary=Sum("salary")),
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[{"firstname": "Joe", "sum_salary": 12}],
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)
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self.assertSequenceEqual(
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joes.values(sum_salary=Sum("salary")), [{"sum_salary": 12}]
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)
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def test_values_list_expression(self):
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companies = Company.objects.values_list("name", F("ceo__salary"))
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self.assertCountEqual(
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companies, [("Example Inc.", 10), ("Foobar Ltd.", 20), ("Test GmbH", 30)]
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)
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def test_values_list_expression_flat(self):
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companies = Company.objects.values_list(F("ceo__salary"), flat=True)
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self.assertCountEqual(companies, (10, 20, 30))
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