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63 lines
2.6 KiB
Python
63 lines
2.6 KiB
Python
from django.db.models.aggregates import Sum
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from django.db.models.expressions import F
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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.', num_employees=2300, 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.', num_employees=3, 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', num_employees=32, num_chairs=1,
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ceo=Employee.objects.create(firstname='Max', lastname='Mustermann', salary=30)
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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_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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[{'firstname': 'Joe', 'sum_salary': 2}, {'firstname': 'Joe', 'sum_salary': 10}],
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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')),
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[{'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.assertSequenceEqual(companies, [('Example Inc.', 10), ('Foobar Ltd.', 20), ('Test GmbH', 30)])
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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.assertSequenceEqual(companies, (10, 20, 30))
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