django/tests/get_or_create/tests.py

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from __future__ import unicode_literals
from datetime import date
import traceback
import warnings
from django.db import IntegrityError, DatabaseError
from django.utils.encoding import DjangoUnicodeDecodeError
from django.test import TestCase, TransactionTestCase
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from .models import (DefaultPerson, Person, ManualPrimaryKeyTest, Profile,
Tag, Thing, Publisher, Author)
class GetOrCreateTests(TestCase):
def setUp(self):
self.lennon = Person.objects.create(
first_name='John', last_name='Lennon', birthday=date(1940, 10, 9)
)
def test_get_or_create_method_with_get(self):
created = Person.objects.get_or_create(
first_name="John", last_name="Lennon", defaults={
"birthday": date(1940, 10, 9)
}
)[1]
self.assertFalse(created)
self.assertEqual(Person.objects.count(), 1)
def test_get_or_create_method_with_create(self):
created = Person.objects.get_or_create(
first_name='George', last_name='Harrison', defaults={
'birthday': date(1943, 2, 25)
}
)[1]
self.assertTrue(created)
self.assertEqual(Person.objects.count(), 2)
def test_get_or_create_redundant_instance(self):
"""
If we execute the exact same statement twice, the second time,
it won't create a Person.
"""
Person.objects.get_or_create(
first_name='George', last_name='Harrison', defaults={
'birthday': date(1943, 2, 25)
}
)
created = Person.objects.get_or_create(
first_name='George', last_name='Harrison', defaults={
'birthday': date(1943, 2, 25)
}
)[1]
self.assertFalse(created)
self.assertEqual(Person.objects.count(), 2)
def test_get_or_create_invalid_params(self):
"""
If you don't specify a value or default value for all required
fields, you will get an error.
"""
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self.assertRaises(
IntegrityError,
Person.objects.get_or_create, first_name="Tom", last_name="Smith"
)
class GetOrCreateTestsWithManualPKs(TestCase):
def setUp(self):
self.first_pk = ManualPrimaryKeyTest.objects.create(id=1, data="Original")
def test_create_with_duplicate_primary_key(self):
"""
If you specify an existing primary key, but different other fields,
then you will get an error and data will not be updated.
"""
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self.assertRaises(
IntegrityError,
ManualPrimaryKeyTest.objects.get_or_create, id=1, data="Different"
)
self.assertEqual(ManualPrimaryKeyTest.objects.get(id=1).data, "Original")
def test_get_or_create_raises_IntegrityError_plus_traceback(self):
"""
get_or_create should raise IntegrityErrors with the full traceback.
This is tested by checking that a known method call is in the traceback.
We cannot use assertRaises here because we need to inspect
the actual traceback. Refs #16340.
"""
try:
ManualPrimaryKeyTest.objects.get_or_create(id=1, data="Different")
except IntegrityError:
formatted_traceback = traceback.format_exc()
self.assertIn(str('obj.save'), formatted_traceback)
def test_savepoint_rollback(self):
"""
Regression test for #20463: the database connection should still be
usable after a DataError or ProgrammingError in .get_or_create().
"""
try:
# Hide warnings when broken data is saved with a warning (MySQL).
with warnings.catch_warnings():
warnings.simplefilter('ignore')
Person.objects.get_or_create(
birthday=date(1970, 1, 1),
defaults={'first_name': b"\xff", 'last_name': b"\xff"})
except (DatabaseError, DjangoUnicodeDecodeError):
Person.objects.create(
first_name="Bob", last_name="Ross", birthday=date(1950, 1, 1))
else:
self.skipTest("This backend accepts broken utf-8.")
def test_get_or_create_empty(self):
"""
Regression test for #16137: get_or_create does not require kwargs.
"""
try:
DefaultPerson.objects.get_or_create()
except AssertionError:
self.fail("If all the attributes on a model have defaults, we "
"shouldn't need to pass any arguments.")
class GetOrCreateTransactionTests(TransactionTestCase):
available_apps = ['get_or_create']
def test_get_or_create_integrityerror(self):
"""
Regression test for #15117. Requires a TransactionTestCase on
databases that delay integrity checks until the end of transactions,
otherwise the exception is never raised.
"""
try:
Profile.objects.get_or_create(person=Person(id=1))
except IntegrityError:
pass
else:
self.skipTest("This backend does not support integrity checks.")
class GetOrCreateThroughManyToMany(TestCase):
def test_get_get_or_create(self):
tag = Tag.objects.create(text='foo')
a_thing = Thing.objects.create(name='a')
a_thing.tags.add(tag)
obj, created = a_thing.tags.get_or_create(text='foo')
self.assertFalse(created)
self.assertEqual(obj.pk, tag.pk)
def test_create_get_or_create(self):
a_thing = Thing.objects.create(name='a')
obj, created = a_thing.tags.get_or_create(text='foo')
self.assertTrue(created)
self.assertEqual(obj.text, 'foo')
self.assertIn(obj, a_thing.tags.all())
def test_something(self):
Tag.objects.create(text='foo')
a_thing = Thing.objects.create(name='a')
self.assertRaises(IntegrityError, a_thing.tags.get_or_create, text='foo')
class UpdateOrCreateTests(TestCase):
def test_update(self):
Person.objects.create(
first_name='John', last_name='Lennon', birthday=date(1940, 10, 9)
)
p, created = Person.objects.update_or_create(
first_name='John', last_name='Lennon', defaults={
'birthday': date(1940, 10, 10)
}
)
self.assertFalse(created)
self.assertEqual(p.first_name, 'John')
self.assertEqual(p.last_name, 'Lennon')
self.assertEqual(p.birthday, date(1940, 10, 10))
def test_create(self):
p, created = Person.objects.update_or_create(
first_name='John', last_name='Lennon', defaults={
'birthday': date(1940, 10, 10)
}
)
self.assertTrue(created)
self.assertEqual(p.first_name, 'John')
self.assertEqual(p.last_name, 'Lennon')
self.assertEqual(p.birthday, date(1940, 10, 10))
def test_create_twice(self):
params = {
'first_name': 'John',
'last_name': 'Lennon',
'birthday': date(1940, 10, 10),
}
Person.objects.update_or_create(**params)
# If we execute the exact same statement, it won't create a Person.
p, created = Person.objects.update_or_create(**params)
self.assertFalse(created)
def test_integrity(self):
"""
If you don't specify a value or default value for all required
fields, you will get an error.
"""
self.assertRaises(IntegrityError,
Person.objects.update_or_create, first_name="Tom", last_name="Smith")
def test_manual_primary_key_test(self):
"""
If you specify an existing primary key, but different other fields,
then you will get an error and data will not be updated.
"""
ManualPrimaryKeyTest.objects.create(id=1, data="Original")
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self.assertRaises(
IntegrityError,
ManualPrimaryKeyTest.objects.update_or_create, id=1, data="Different"
)
self.assertEqual(ManualPrimaryKeyTest.objects.get(id=1).data, "Original")
def test_error_contains_full_traceback(self):
"""
update_or_create should raise IntegrityErrors with the full traceback.
This is tested by checking that a known method call is in the traceback.
We cannot use assertRaises/assertRaises here because we need to inspect
the actual traceback. Refs #16340.
"""
try:
ManualPrimaryKeyTest.objects.update_or_create(id=1, data="Different")
except IntegrityError:
formatted_traceback = traceback.format_exc()
self.assertIn('obj.save', formatted_traceback)
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def test_related(self):
p = Publisher.objects.create(name="Acme Publishing")
# Create a book through the publisher.
book, created = p.books.get_or_create(name="The Book of Ed & Fred")
self.assertTrue(created)
# The publisher should have one book.
self.assertEqual(p.books.count(), 1)
# Try get_or_create again, this time nothing should be created.
book, created = p.books.get_or_create(name="The Book of Ed & Fred")
self.assertFalse(created)
# And the publisher should still have one book.
self.assertEqual(p.books.count(), 1)
# Add an author to the book.
ed, created = book.authors.get_or_create(name="Ed")
self.assertTrue(created)
# The book should have one author.
self.assertEqual(book.authors.count(), 1)
# Try get_or_create again, this time nothing should be created.
ed, created = book.authors.get_or_create(name="Ed")
self.assertFalse(created)
# And the book should still have one author.
self.assertEqual(book.authors.count(), 1)
# Add a second author to the book.
fred, created = book.authors.get_or_create(name="Fred")
self.assertTrue(created)
# The book should have two authors now.
self.assertEqual(book.authors.count(), 2)
# Create an Author not tied to any books.
Author.objects.create(name="Ted")
# There should be three Authors in total. The book object should have two.
self.assertEqual(Author.objects.count(), 3)
self.assertEqual(book.authors.count(), 2)
# Try creating a book through an author.
_, created = ed.books.get_or_create(name="Ed's Recipes", publisher=p)
self.assertTrue(created)
# Now Ed has two Books, Fred just one.
self.assertEqual(ed.books.count(), 2)
self.assertEqual(fred.books.count(), 1)
# Use the publisher's primary key value instead of a model instance.
_, created = ed.books.get_or_create(name='The Great Book of Ed', publisher_id=p.id)
self.assertTrue(created)
# Try get_or_create again, this time nothing should be created.
_, created = ed.books.get_or_create(name='The Great Book of Ed', publisher_id=p.id)
self.assertFalse(created)
# The publisher should have three books.
self.assertEqual(p.books.count(), 3)