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from __future__ import absolute_import
from operator import attrgetter
from django.test import TestCase, skipIfDBFeature, skipUnlessDBFeature
from .models import Country, Restaurant, Pizzeria, State
class BulkCreateTests(TestCase):
def setUp(self):
self.data = [
Country(name="United States of America", iso_two_letter="US"),
Country(name="The Netherlands", iso_two_letter="NL"),
Country(name="Germany", iso_two_letter="DE"),
Country(name="Czech Republic", iso_two_letter="CZ")
]
def test_simple(self):
created = Country.objects.bulk_create(self.data)
self.assertEqual(len(created), 4)
self.assertQuerysetEqual(Country.objects.order_by("-name"), [
"United States of America", "The Netherlands", "Germany", "Czech Republic"
], attrgetter("name"))
created = Country.objects.bulk_create([])
self.assertEqual(created, [])
self.assertEqual(Country.objects.count(), 4)
@skipUnlessDBFeature("has_bulk_insert")
def test_efficiency(self):
with self.assertNumQueries(1):
Country.objects.bulk_create(self.data)
def test_inheritance(self):
Restaurant.objects.bulk_create([
Restaurant(name="Nicholas's")
])
self.assertQuerysetEqual(Restaurant.objects.all(), [
"Nicholas's",
], attrgetter("name"))
with self.assertRaises(ValueError):
Pizzeria.objects.bulk_create([
Pizzeria(name="The Art of Pizza")
])
self.assertQuerysetEqual(Pizzeria.objects.all(), [])
self.assertQuerysetEqual(Restaurant.objects.all(), [
"Nicholas's",
], attrgetter("name"))
def test_non_auto_increment_pk(self):
with self.assertNumQueries(1):
State.objects.bulk_create([
State(two_letter_code=s)
for s in ["IL", "NY", "CA", "ME"]
])
self.assertQuerysetEqual(State.objects.order_by("two_letter_code"), [
"CA", "IL", "ME", "NY",
], attrgetter("two_letter_code"))
@skipIfDBFeature('allows_primary_key_0')
def test_zero_as_autoval(self):
"""
Zero as id for AutoField should raise exception in MySQL, because MySQL
does not allow zero for automatic primary key.
"""
valid_country = Country(name='Germany', iso_two_letter='DE')
invalid_country = Country(id=0, name='Poland', iso_two_letter='PL')
with self.assertRaises(ValueError):
Country.objects.bulk_create([valid_country, invalid_country])
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