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Fixed #23365 -- Added support for timezone-aware datetimes to migrations.
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@ -5,7 +5,7 @@ import os
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import sys
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from django.apps import apps
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from django.utils import datetime_safe, six
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from django.utils import datetime_safe, six, timezone
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from django.utils.six.moves import input
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from .loader import MIGRATIONS_MODULE_NAME
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@ -108,7 +108,8 @@ class InteractiveMigrationQuestioner(MigrationQuestioner):
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sys.exit(3)
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else:
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print("Please enter the default value now, as valid Python")
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print("The datetime module is available, so you can do e.g. datetime.date.today()")
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print("The datetime and django.utils.timezone modules are "
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"available, so you can do e.g. timezone.now()")
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while True:
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if six.PY3:
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# Six does not correctly abstract over the fact that
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@ -123,7 +124,7 @@ class InteractiveMigrationQuestioner(MigrationQuestioner):
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sys.exit(1)
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else:
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try:
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return eval(code, {}, {"datetime": datetime_safe})
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return eval(code, {}, {"datetime": datetime_safe, "timezone": timezone})
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except (SyntaxError, NameError) as e:
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print("Invalid input: %s" % e)
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return None
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@ -16,6 +16,7 @@ from django.db.migrations.loader import MigrationLoader
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from django.utils import datetime_safe, six
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from django.utils.encoding import force_text
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from django.utils.functional import Promise
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from django.utils.timezone import utc
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COMPILED_REGEX_TYPE = type(re.compile(''))
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@ -164,6 +165,20 @@ class MigrationWriter(object):
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return (MIGRATION_TEMPLATE % items).encode("utf8")
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@staticmethod
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def serialize_datetime(value):
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"""
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Returns a serialized version of a datetime object that is valid,
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executable python code. It converts timezone-aware values to utc with
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an 'executable' utc representation of tzinfo.
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"""
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if value.tzinfo is not None and value.tzinfo != utc:
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value = value.astimezone(utc)
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value_repr = repr(value).replace("<UTC>", "utc")
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if isinstance(value, datetime_safe.datetime):
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value_repr = "datetime.%s" % value_repr
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return value_repr
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@property
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def filename(self):
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return "%s.py" % self.migration.name
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@ -268,12 +283,11 @@ class MigrationWriter(object):
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return "{%s}" % (", ".join("%s: %s" % (k, v) for k, v in strings)), imports
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# Datetimes
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elif isinstance(value, datetime.datetime):
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value_repr = cls.serialize_datetime(value)
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imports = ["import datetime"]
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if value.tzinfo is not None:
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raise ValueError("Cannot serialize datetime values with timezones. Either use a callable value for default or remove the timezone.")
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value_repr = repr(value)
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if isinstance(value, datetime_safe.datetime):
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value_repr = "datetime.%s" % value_repr
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return value_repr, {"import datetime"}
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imports.append("from django.utils.timezone import utc")
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return value_repr, set(imports)
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# Dates
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elif isinstance(value, datetime.date):
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value_repr = repr(value)
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@ -260,6 +260,8 @@ Management Commands
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* The :djadminopt:`--name` option for :djadmin:`makemigrations` allows you to
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to give the migration(s) a custom name instead of a generated one.
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* :djadmin:`makemigrations` can now serialize timezone-aware values.
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Models
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^^^^^^
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@ -543,12 +543,17 @@ Django can serialize the following:
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- ``int``, ``long``, ``float``, ``bool``, ``str``, ``unicode``, ``bytes``, ``None``
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- ``list``, ``set``, ``tuple``, ``dict``
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- ``datetime.date``, ``datetime.time``, and ``datetime.datetime`` instances
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(include those that are timezone-aware)
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- ``decimal.Decimal`` instances
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- Any Django field
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- Any function or method reference (e.g. ``datetime.datetime.today``) (must be in module's top-level scope)
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- Any class reference (must be in module's top-level scope)
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- Anything with a custom ``deconstruct()`` method (:ref:`see below <custom-deconstruct-method>`)
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.. versionchanged:: 1.8
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Support for serializing timezone-aware datetimes was added.
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Django can serialize the following on Python 3 only:
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- Unbound methods used from within the class body (see below)
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@ -16,7 +16,7 @@ from django.conf import settings
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from django.utils import datetime_safe, six
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from django.utils.deconstruct import deconstructible
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from django.utils.translation import ugettext_lazy as _
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from django.utils.timezone import get_default_timezone
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from django.utils.timezone import get_default_timezone, utc, FixedOffset
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import custom_migration_operations.operations
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import custom_migration_operations.more_operations
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@ -101,8 +101,8 @@ class WriterTests(TestCase):
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self.assertSerializedEqual(datetime.date.today())
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self.assertSerializedEqual(datetime.date.today)
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self.assertSerializedEqual(datetime.datetime.now().time())
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with self.assertRaises(ValueError):
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self.assertSerializedEqual(datetime.datetime(2012, 1, 1, 1, 1, tzinfo=get_default_timezone()))
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self.assertSerializedEqual(datetime.datetime(2014, 1, 1, 1, 1, tzinfo=get_default_timezone()))
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self.assertSerializedEqual(datetime.datetime(2014, 1, 1, 1, 1, tzinfo=FixedOffset(180)))
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safe_date = datetime_safe.date(2014, 3, 31)
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string, imports = MigrationWriter.serialize(safe_date)
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self.assertEqual(string, repr(datetime.date(2014, 3, 31)))
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@ -111,6 +111,10 @@ class WriterTests(TestCase):
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string, imports = MigrationWriter.serialize(safe_datetime)
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self.assertEqual(string, repr(datetime.datetime(2014, 3, 31, 16, 4, 31)))
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self.assertEqual(imports, {'import datetime'})
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timezone_aware_datetime = datetime.datetime(2012, 1, 1, 1, 1, tzinfo=utc)
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string, imports = MigrationWriter.serialize(timezone_aware_datetime)
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self.assertEqual(string, "datetime.datetime(2012, 1, 1, 1, 1, tzinfo=utc)")
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self.assertEqual(imports, {'import datetime', 'from django.utils.timezone import utc'})
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# Django fields
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self.assertSerializedFieldEqual(models.CharField(max_length=255))
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self.assertSerializedFieldEqual(models.TextField(null=True, blank=True))
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@ -312,3 +316,22 @@ class WriterTests(TestCase):
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result['custom_migration_operations'].operations.TestOperation,
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result['custom_migration_operations'].more_operations.TestOperation
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)
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def test_serialize_datetime(self):
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"""
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#23365 -- Timezone-aware datetimes should be allowed.
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"""
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# naive datetime
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naive_datetime = datetime.datetime(2014, 1, 1, 1, 1)
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self.assertEqual(MigrationWriter.serialize_datetime(naive_datetime),
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"datetime.datetime(2014, 1, 1, 1, 1)")
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# datetime with utc timezone
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utc_datetime = datetime.datetime(2014, 1, 1, 1, 1, tzinfo=utc)
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self.assertEqual(MigrationWriter.serialize_datetime(utc_datetime),
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"datetime.datetime(2014, 1, 1, 1, 1, tzinfo=utc)")
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# datetime with FixedOffset tzinfo
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fixed_offset_datetime = datetime.datetime(2014, 1, 1, 1, 1, tzinfo=FixedOffset(180))
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self.assertEqual(MigrationWriter.serialize_datetime(fixed_offset_datetime),
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"datetime.datetime(2013, 12, 31, 22, 1, tzinfo=utc)")
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