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# -*- coding: utf-8 -*-
from __future__ import absolute_import, unicode_literals
from django.db import transaction, IntegrityError
from django.test import TestCase, skipIfDBFeature
from django.utils import six
from .models import Employee, Business, Bar, Foo
class CustomPKTests(TestCase):
def test_custom_pk(self):
dan = Employee.objects.create(
employee_code=123, first_name="Dan", last_name="Jones"
)
self.assertQuerysetEqual(
Employee.objects.all(), [
"Dan Jones",
],
six.text_type
)
fran = Employee.objects.create(
employee_code=456, first_name="Fran", last_name="Bones"
)
self.assertQuerysetEqual(
Employee.objects.all(), [
"Fran Bones",
"Dan Jones",
],
six.text_type
)
self.assertEqual(Employee.objects.get(pk=123), dan)
self.assertEqual(Employee.objects.get(pk=456), fran)
self.assertRaises(Employee.DoesNotExist,
lambda: Employee.objects.get(pk=42)
)
# Use the name of the primary key, rather than pk.
self.assertEqual(Employee.objects.get(employee_code=123), dan)
# pk can be used as a substitute for the primary key.
self.assertQuerysetEqual(
Employee.objects.filter(pk__in=[123, 456]), [
"Fran Bones",
"Dan Jones",
],
six.text_type
)
# The primary key can be accessed via the pk property on the model.
e = Employee.objects.get(pk=123)
self.assertEqual(e.pk, 123)
# Or we can use the real attribute name for the primary key:
self.assertEqual(e.employee_code, 123)
# Fran got married and changed her last name.
fran = Employee.objects.get(pk=456)
fran.last_name = "Jones"
fran.save()
self.assertQuerysetEqual(
Employee.objects.filter(last_name="Jones"), [
"Dan Jones",
"Fran Jones",
],
six.text_type
)
emps = Employee.objects.in_bulk([123, 456])
self.assertEqual(emps[123], dan)
b = Business.objects.create(name="Sears")
b.employees.add(dan, fran)
self.assertQuerysetEqual(
b.employees.all(), [
"Dan Jones",
"Fran Jones",
],
six.text_type
)
self.assertQuerysetEqual(
fran.business_set.all(), [
"Sears",
],
lambda b: b.name
)
self.assertEqual(Business.objects.in_bulk(["Sears"]), {
"Sears": b,
})
self.assertQuerysetEqual(
Business.objects.filter(name="Sears"), [
"Sears"
],
lambda b: b.name
)
self.assertQuerysetEqual(
Business.objects.filter(pk="Sears"), [
"Sears",
],
lambda b: b.name
)
# Queries across tables, involving primary key
self.assertQuerysetEqual(
Employee.objects.filter(business__name="Sears"), [
"Dan Jones",
"Fran Jones",
],
six.text_type,
)
self.assertQuerysetEqual(
Employee.objects.filter(business__pk="Sears"), [
"Dan Jones",
"Fran Jones",
],
six.text_type,
)
self.assertQuerysetEqual(
Business.objects.filter(employees__employee_code=123), [
"Sears",
],
lambda b: b.name
)
self.assertQuerysetEqual(
Business.objects.filter(employees__pk=123), [
"Sears",
],
lambda b: b.name,
)
self.assertQuerysetEqual(
Business.objects.filter(employees__first_name__startswith="Fran"), [
"Sears",
],
lambda b: b.name
)
def test_unicode_pk(self):
# Primary key may be unicode string
bus = Business.objects.create(name='jaźń')
def test_unique_pk(self):
# The primary key must also obviously be unique, so trying to create a
# new object with the same primary key will fail.
e = Employee.objects.create(
employee_code=123, first_name="Frank", last_name="Jones"
)
sid = transaction.savepoint()
self.assertRaises(IntegrityError,
Employee.objects.create, employee_code=123, first_name="Fred", last_name="Jones"
)
transaction.savepoint_rollback(sid)
def test_custom_field_pk(self):
# Regression for #10785 -- Custom fields can be used for primary keys.
new_bar = Bar.objects.create()
new_foo = Foo.objects.create(bar=new_bar)
f = Foo.objects.get(bar=new_bar.pk)
self.assertEqual(f, new_foo)
self.assertEqual(f.bar, new_bar)
f = Foo.objects.get(bar=new_bar)
self.assertEqual(f, new_foo),
self.assertEqual(f.bar, new_bar)
# SQLite lets objects be saved with an empty primary key, even though an
# integer is expected. So we can't check for an error being raised in that
# case for SQLite. Remove it from the suite for this next bit.
@skipIfDBFeature('supports_unspecified_pk')
def test_required_pk(self):
# The primary key must be specified, so an error is raised if you
# try to create an object without it.
sid = transaction.savepoint()
self.assertRaises(IntegrityError,
Employee.objects.create, first_name="Tom", last_name="Smith"
)
transaction.savepoint_rollback(sid)
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