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test_obj_update.py
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test_obj_update.py
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import datetime as dt
import logging.config
from decimal import Decimal
import django
from django.db import transaction
from django.test import TestCase, TransactionTestCase
from test_app.models import FooModel, BarModel
from obj_update import obj_update, obj_update_or_create
logging.config.dictConfig(
{
"version": 1,
"formatters": {"json": {"class": "pythonjsonlogger.jsonlogger.JsonFormatter"}},
"handlers": {
"console": {"class": "logging.StreamHandler", "formatter": "json"},
"null": {"class": "logging.NullHandler", "formatter": "json"},
},
"loggers": {
# Edit this config to play with these to test different logging scenarios
"obj_update": {"level": "DEBUG", "handlers": ["null"]},
# "obj_update.create": {"level": "DEBUG", "handlers": ["console"]},
# "obj_update.update": {"level": "DEBUG", "handlers": ["console"]},
},
}
)
class UpdateTests(TestCase):
def test_can_update_fields(self):
foo = FooModel.objects.create(text="hello")
with self.assertNumQueries(1):
obj_update(foo, {"text": "hello2"})
foo.refresh_from_db()
self.assertEqual(foo.text, "hello2")
def test_can_update_fields_but_not_save(self):
foo = FooModel.objects.create(text="hello")
with self.assertNumQueries(0):
obj_update(foo, {"text": "hello2"}, update_fields=[])
self.assertEqual(foo.text, "hello2")
def test_can_update_fields_but_not_save_DEPRECATED(self):
foo = FooModel.objects.create(text="hello")
with self.assertNumQueries(0):
obj_update(foo, {"text": "hello2"}, save=False)
self.assertEqual(foo.text, "hello2")
def test_update_fields_stuff(self):
foo = FooModel(text="hello")
# Sanity check: fails without update_fields
with transaction.atomic(), self.assertRaises(ValueError):
obj_update(foo, {"text": "hello2"})
with self.assertNumQueries(1):
obj_update(foo, {"text": "hello2"}, update_fields=None)
foo.refresh_from_db()
self.assertEqual(foo.text, "hello2")
self.assertTrue(foo.id)
def test_no_changes_mean_no_queries(self):
# setup
foo = FooModel.objects.create(text="hello")
with self.assertNumQueries(0):
obj_update(foo, {"text": "hello"})
with self.assertNumQueries(0):
obj_update(foo, {"text": u"hello"})
# FIXME? This fails in Python 3
# with self.assertNumQueries(0):
# obj_update(foo, {'text': b'hello'})
# LOGGING
#########
def test_logging(self):
foo = FooModel.objects.create(text="hello")
with self.assertLogs("obj_update", level="DEBUG") as cm:
obj_update(foo, {"text": "hello2"})
self.assertEqual(len(cm.records), 1)
record = cm.records[0]
self.assertEqual(record.model, "FooModel")
self.assertEqual(record.pk, foo.pk)
self.assertEqual(record.changes["text"]["old"], "hello")
self.assertEqual(record.changes["text"]["new"], "hello2")
# MODEL FIELD TYPES
###################
def test_datetime_vs_datetime(self):
foo = FooModel.objects.create(datetime=dt.datetime(2029, 9, 20, 1, 2, 3))
with self.assertNumQueries(0):
obj_update(foo, {"datetime": dt.datetime(2029, 9, 20, 1, 2, 3)})
def test_datetime_vs_str(self):
foo = FooModel.objects.create(datetime=dt.datetime(2029, 9, 20, 1, 2, 3))
with self.assertNumQueries(0):
obj_update(foo, {"datetime": "2029-09-20 01:02:03"})
with self.assertNumQueries(0):
obj_update(foo, {"datetime": "2029-09-20T01:02:03"})
def test_datetime_updates_str(self):
foo = FooModel.objects.create(datetime=dt.datetime(2029, 9, 20, 1, 2, 3))
with self.assertNumQueries(1):
obj_update(foo, {"datetime": "2029-04-20 03:14:15"})
with self.assertNumQueries(1):
obj_update(foo, {"datetime": "2029-04-01T03:14:15"})
def test_datetime_is_set(self):
foo = FooModel.objects.create(datetime=dt.datetime(2029, 9, 20, 1, 2, 3))
with self.assertNumQueries(1):
obj_update(foo, {"datetime": dt.datetime(1111, 1, 1, 1, 1, 1)})
def test_decimal_a_text(self):
# setup
foo = FooModel.objects.create(decimal="10.1")
# sanity check
self.assertIsInstance(foo.decimal, str)
with self.assertNumQueries(0):
# 0 because input is exactly the same
obj_update(foo, {"decimal": "10.1"})
with self.assertNumQueries(0):
obj_update(foo, {"decimal": 10.1})
with self.assertNumQueries(1):
obj_update(foo, {"decimal": 1.01})
foo = FooModel.objects.get(pk=foo.pk)
self.assertEqual(foo.decimal, Decimal("1.01"))
# is this any different from text?
def test_slug(self):
# setup
foo = FooModel.objects.create(slug="hello")
with self.assertNumQueries(0):
obj_update(foo, {"slug": "hello"})
with self.assertNumQueries(1):
obj_update(foo, {"slug": "hello1"})
foo = FooModel.objects.get(pk=foo.pk)
self.assertEqual(foo.slug, "hello1")
def test_text(self):
# setup
foo = FooModel.objects.create(text="hello")
with self.assertNumQueries(0):
obj_update(foo, {"text": "hello"})
with self.assertNumQueries(1):
obj_update(foo, {"text": "hello1"})
foo = FooModel.objects.get(pk=foo.pk)
self.assertEqual(foo.text, "hello1")
def test_foreignkey_adding(self):
foo = FooModel.objects.create(foreignkey=None)
bar = BarModel.objects.create()
with self.assertNumQueries(0):
obj_update(foo, {"foreignkey": None})
with self.assertNumQueries(1):
obj_update(foo, {"foreignkey": bar})
def test_foreignkey_adding_as_id(self):
foo = FooModel.objects.create(foreignkey=None)
bar = BarModel.objects.create()
with self.assertNumQueries(0):
obj_update(foo, {"foreignkey": None})
with self.assertNumQueries(1):
obj_update(foo, {"foreignkey_id": bar.pk})
foo = FooModel.objects.get(pk=foo.pk)
self.assertEqual(foo.foreignkey, bar)
def test_foreignkey_removing(self):
# setup
bar = BarModel.objects.create()
foo = FooModel.objects.create(foreignkey=bar)
with self.assertNumQueries(0):
obj_update(foo, {"foreignkey": bar})
self.assertEqual(foo.foreignkey, bar)
with self.assertNumQueries(1):
obj_update(foo, {"foreignkey": None})
foo = FooModel.objects.get(pk=foo.pk)
self.assertEqual(foo.foreignkey, None)
def test_foreignkey_changing(self):
# setup
bar1 = BarModel.objects.create()
bar2 = BarModel.objects.create()
foo = FooModel.objects.create(text="hello", foreignkey=bar1)
with self.assertNumQueries(0):
obj_update(foo, {"foreignkey": bar1})
self.assertEqual(foo.foreignkey, bar1)
with self.assertNumQueries(1):
obj_update(foo, {"foreignkey": bar2})
self.assertEqual(foo.foreignkey, bar2)
def test_foreignkey_changing_as_id(self):
# setup
bar1 = BarModel.objects.create()
bar2 = BarModel.objects.create()
foo = FooModel.objects.create(text="hello", foreignkey=bar1)
with self.assertNumQueries(0):
obj_update(foo, {"foreignkey_id": bar1.id})
foo = FooModel.objects.get(pk=foo.pk)
self.assertEqual(foo.foreignkey, bar1)
with self.assertNumQueries(1):
obj_update(foo, {"foreignkey_id": bar2.id})
foo = FooModel.objects.get(pk=foo.pk)
self.assertEqual(foo.foreignkey, bar2)
class ObjUpdateOrCreateTests(TransactionTestCase):
def test_workflow(self):
# Test creation
with self.assertNumQueries(3):
# 1. SELECT
# 2. BEGIN
# 3. INSERT
foo, created = obj_update_or_create(
FooModel, text="hi", defaults={"slug": "leopard"}
)
self.assertTrue(created)
self.assertEqual(foo.text, "hi")
self.assertEqual(foo.slug, "leopard")
# Test updating with nothing new
with self.assertNumQueries(1):
# 1. SELECT
foo, created = obj_update_or_create(
FooModel, text="hi", defaults={"slug": "leopard"}
)
self.assertFalse(created)
self.assertEqual(foo.text, "hi")
self.assertEqual(foo.slug, "leopard")
# Test updating with new data
num_queries = 3 if django.VERSION < (2, 2) else 2
with self.assertNumQueries(num_queries):
# 1. SELECT
# 2. BEGIN if Django<2.2 Django no longer always starts a transaction when a single query is being performed https://docs.djangoproject.com/en/2.2/releases/2.2/
# 3. INSERT
foo, created = obj_update_or_create(
FooModel, text="hi", defaults={"slug": "lemon", "decimal": "0.01"}
)
self.assertFalse(created)
self.assertEqual(foo.text, "hi")
self.assertEqual(foo.slug, "lemon")
self.assertEqual(foo.decimal, "0.01")