django/tests/migrations/test_writer.py

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# encoding: utf8
from __future__ import unicode_literals
import copy
import datetime
import os
from django.core.validators import RegexValidator, EmailValidator
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from django.db import models, migrations
from django.db.migrations.writer import MigrationWriter
from django.db.models.loading import cache
from django.test import TestCase, override_settings
from django.utils import six
from django.utils.deconstruct import deconstructible
from django.utils.translation import ugettext_lazy as _
class WriterTests(TestCase):
"""
Tests the migration writer (makes migration files from Migration instances)
"""
def safe_exec(self, string, value=None):
l = {}
try:
exec(string, globals(), l)
except Exception as e:
if value:
self.fail("Could not exec %r (from value %r): %s" % (string.strip(), value, e))
else:
self.fail("Could not exec %r: %s" % (string.strip(), e))
return l
def serialize_round_trip(self, value):
string, imports = MigrationWriter.serialize(value)
return self.safe_exec("%s\ntest_value_result = %s" % ("\n".join(imports), string), value)['test_value_result']
def assertSerializedEqual(self, value):
self.assertEqual(self.serialize_round_trip(value), value)
def assertSerializedIs(self, value):
self.assertIs(self.serialize_round_trip(value), value)
def assertSerializedFieldEqual(self, value):
new_value = self.serialize_round_trip(value)
self.assertEqual(value.__class__, new_value.__class__)
self.assertEqual(value.max_length, new_value.max_length)
self.assertEqual(value.null, new_value.null)
self.assertEqual(value.unique, new_value.unique)
def test_serialize(self):
"""
Tests various different forms of the serializer.
This does not care about formatting, just that the parsed result is
correct, so we always exec() the result and check that.
"""
# Basic values
self.assertSerializedEqual(1)
self.assertSerializedEqual(None)
self.assertSerializedEqual(b"foobar")
self.assertSerializedEqual("föobár")
self.assertSerializedEqual({1: 2})
self.assertSerializedEqual(["a", 2, True, None])
self.assertSerializedEqual(set([2, 3, "eighty"]))
self.assertSerializedEqual({"lalalala": ["yeah", "no", "maybe"]})
self.assertSerializedEqual(_('Hello'))
# Functions
with six.assertRaisesRegex(self, ValueError, 'Cannot serialize function: lambda'):
self.assertSerializedEqual(lambda x: 42)
self.assertSerializedEqual(models.SET_NULL)
string, imports = MigrationWriter.serialize(models.SET(42))
self.assertEqual(string, 'models.SET(42)')
self.serialize_round_trip(models.SET(42))
# Datetime stuff
self.assertSerializedEqual(datetime.datetime.utcnow())
self.assertSerializedEqual(datetime.datetime.utcnow)
self.assertSerializedEqual(datetime.datetime.today())
self.assertSerializedEqual(datetime.datetime.today)
self.assertSerializedEqual(datetime.date.today())
self.assertSerializedEqual(datetime.date.today)
# Classes
validator = RegexValidator(message="hello")
string, imports = MigrationWriter.serialize(validator)
self.assertEqual(string, "django.core.validators.RegexValidator(message=%s)" % repr("hello"))
self.serialize_round_trip(validator)
validator = EmailValidator(message="hello") # Test with a subclass.
string, imports = MigrationWriter.serialize(validator)
self.assertEqual(string, "django.core.validators.EmailValidator(message=%s)" % repr("hello"))
self.serialize_round_trip(validator)
validator = deconstructible(path="custom.EmailValidator")(EmailValidator)(message="hello")
string, imports = MigrationWriter.serialize(validator)
self.assertEqual(string, "custom.EmailValidator(message=%s)" % repr("hello"))
# Django fields
self.assertSerializedFieldEqual(models.CharField(max_length=255))
self.assertSerializedFieldEqual(models.TextField(null=True, blank=True))
def test_simple_migration(self):
"""
Tests serializing a simple migration.
"""
migration = type(str("Migration"), (migrations.Migration,), {
"operations": [
migrations.DeleteModel("MyModel"),
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migrations.AddField("OtherModel", "field_name", models.DateTimeField(default=datetime.datetime.utcnow))
],
"dependencies": [("testapp", "some_other_one")],
})
writer = MigrationWriter(migration)
output = writer.as_string()
# It should NOT be unicode.
self.assertIsInstance(output, six.binary_type, "Migration as_string returned unicode")
# We don't test the output formatting - that's too fragile.
# Just make sure it runs for now, and that things look alright.
result = self.safe_exec(output)
self.assertIn("Migration", result)
def test_migration_path(self):
_old_app_store = copy.deepcopy(cache.app_store)
test_apps = [
'migrations.migrations_test_apps.normal',
'migrations.migrations_test_apps.with_package_model',
]
base_dir = os.path.dirname(os.path.dirname(__file__))
try:
with override_settings(INSTALLED_APPS=test_apps):
for app in test_apps:
cache.load_app(app)
migration = migrations.Migration('0001_initial', app.split('.')[-1])
expected_path = os.path.join(base_dir, *(app.split('.') + ['migrations', '0001_initial.py']))
writer = MigrationWriter(migration)
self.assertEqual(writer.path, expected_path)
finally:
cache.app_store = _old_app_store