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