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test_writer.py
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test_writer.py
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import datetime
import decimal
import enum
import functools
import math
import os
import re
import uuid
from unittest import mock
import custom_migration_operations.more_operations
import custom_migration_operations.operations
from django import get_version
from django.conf import settings
from django.core.validators import EmailValidator, RegexValidator
from django.db import migrations, models
from django.db.migrations.writer import (
MigrationWriter, OperationWriter, SettingsReference,
)
from django.test import SimpleTestCase
from django.utils.deconstruct import deconstructible
from django.utils.functional import SimpleLazyObject
from django.utils.timezone import get_default_timezone, get_fixed_timezone, utc
from django.utils.translation import gettext_lazy as _
from django.utils.version import PY36
from .models import FoodManager, FoodQuerySet
class Money(decimal.Decimal):
def deconstruct(self):
return (
'%s.%s' % (self.__class__.__module__, self.__class__.__name__),
[str(self)],
{}
)
class TestModel1:
def upload_to(self):
return '/somewhere/dynamic/'
thing = models.FileField(upload_to=upload_to)
class OperationWriterTests(SimpleTestCase):
def test_empty_signature(self):
operation = custom_migration_operations.operations.TestOperation()
buff, imports = OperationWriter(operation, indentation=0).serialize()
self.assertEqual(imports, {'import custom_migration_operations.operations'})
self.assertEqual(
buff,
'custom_migration_operations.operations.TestOperation(\n'
'),'
)
def test_args_signature(self):
operation = custom_migration_operations.operations.ArgsOperation(1, 2)
buff, imports = OperationWriter(operation, indentation=0).serialize()
self.assertEqual(imports, {'import custom_migration_operations.operations'})
self.assertEqual(
buff,
'custom_migration_operations.operations.ArgsOperation(\n'
' arg1=1,\n'
' arg2=2,\n'
'),'
)
def test_kwargs_signature(self):
operation = custom_migration_operations.operations.KwargsOperation(kwarg1=1)
buff, imports = OperationWriter(operation, indentation=0).serialize()
self.assertEqual(imports, {'import custom_migration_operations.operations'})
self.assertEqual(
buff,
'custom_migration_operations.operations.KwargsOperation(\n'
' kwarg1=1,\n'
'),'
)
def test_args_kwargs_signature(self):
operation = custom_migration_operations.operations.ArgsKwargsOperation(1, 2, kwarg2=4)
buff, imports = OperationWriter(operation, indentation=0).serialize()
self.assertEqual(imports, {'import custom_migration_operations.operations'})
self.assertEqual(
buff,
'custom_migration_operations.operations.ArgsKwargsOperation(\n'
' arg1=1,\n'
' arg2=2,\n'
' kwarg2=4,\n'
'),'
)
def test_nested_args_signature(self):
operation = custom_migration_operations.operations.ArgsOperation(
custom_migration_operations.operations.ArgsOperation(1, 2),
custom_migration_operations.operations.KwargsOperation(kwarg1=3, kwarg2=4)
)
buff, imports = OperationWriter(operation, indentation=0).serialize()
self.assertEqual(imports, {'import custom_migration_operations.operations'})
self.assertEqual(
buff,
'custom_migration_operations.operations.ArgsOperation(\n'
' arg1=custom_migration_operations.operations.ArgsOperation(\n'
' arg1=1,\n'
' arg2=2,\n'
' ),\n'
' arg2=custom_migration_operations.operations.KwargsOperation(\n'
' kwarg1=3,\n'
' kwarg2=4,\n'
' ),\n'
'),'
)
def test_multiline_args_signature(self):
operation = custom_migration_operations.operations.ArgsOperation("test\n arg1", "test\narg2")
buff, imports = OperationWriter(operation, indentation=0).serialize()
self.assertEqual(imports, {'import custom_migration_operations.operations'})
self.assertEqual(
buff,
"custom_migration_operations.operations.ArgsOperation(\n"
" arg1='test\\n arg1',\n"
" arg2='test\\narg2',\n"
"),"
)
def test_expand_args_signature(self):
operation = custom_migration_operations.operations.ExpandArgsOperation([1, 2])
buff, imports = OperationWriter(operation, indentation=0).serialize()
self.assertEqual(imports, {'import custom_migration_operations.operations'})
self.assertEqual(
buff,
'custom_migration_operations.operations.ExpandArgsOperation(\n'
' arg=[\n'
' 1,\n'
' 2,\n'
' ],\n'
'),'
)
def test_nested_operation_expand_args_signature(self):
operation = custom_migration_operations.operations.ExpandArgsOperation(
arg=[
custom_migration_operations.operations.KwargsOperation(
kwarg1=1,
kwarg2=2,
),
]
)
buff, imports = OperationWriter(operation, indentation=0).serialize()
self.assertEqual(imports, {'import custom_migration_operations.operations'})
self.assertEqual(
buff,
'custom_migration_operations.operations.ExpandArgsOperation(\n'
' arg=[\n'
' custom_migration_operations.operations.KwargsOperation(\n'
' kwarg1=1,\n'
' kwarg2=2,\n'
' ),\n'
' ],\n'
'),'
)
class WriterTests(SimpleTestCase):
"""
Tests the migration writer (makes migration files from Migration instances)
"""
def safe_exec(self, string, value=None):
d = {}
try:
exec(string, globals(), d)
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 d
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 assertSerializedResultEqual(self, value, target):
self.assertEqual(MigrationWriter.serialize(value), target)
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_numbers(self):
self.assertSerializedEqual(1)
self.assertSerializedEqual(1.2)
self.assertTrue(math.isinf(self.serialize_round_trip(float("inf"))))
self.assertTrue(math.isinf(self.serialize_round_trip(float("-inf"))))
self.assertTrue(math.isnan(self.serialize_round_trip(float("nan"))))
self.assertSerializedEqual(decimal.Decimal('1.3'))
self.assertSerializedResultEqual(
decimal.Decimal('1.3'),
("Decimal('1.3')", {'from decimal import Decimal'})
)
self.assertSerializedEqual(Money('1.3'))
self.assertSerializedResultEqual(
Money('1.3'),
("migrations.test_writer.Money('1.3')", {'import migrations.test_writer'})
)
def test_serialize_constants(self):
self.assertSerializedEqual(None)
self.assertSerializedEqual(True)
self.assertSerializedEqual(False)
def test_serialize_strings(self):
self.assertSerializedEqual(b"foobar")
string, imports = MigrationWriter.serialize(b"foobar")
self.assertEqual(string, "b'foobar'")
self.assertSerializedEqual("föobár")
string, imports = MigrationWriter.serialize("foobar")
self.assertEqual(string, "'foobar'")
def test_serialize_multiline_strings(self):
self.assertSerializedEqual(b"foo\nbar")
string, imports = MigrationWriter.serialize(b"foo\nbar")
self.assertEqual(string, "b'foo\\nbar'")
self.assertSerializedEqual("föo\nbár")
string, imports = MigrationWriter.serialize("foo\nbar")
self.assertEqual(string, "'foo\\nbar'")
def test_serialize_collections(self):
self.assertSerializedEqual({1: 2})
self.assertSerializedEqual(["a", 2, True, None])
self.assertSerializedEqual({2, 3, "eighty"})
self.assertSerializedEqual({"lalalala": ["yeah", "no", "maybe"]})
self.assertSerializedEqual(_('Hello'))
def test_serialize_builtin_types(self):
self.assertSerializedEqual([list, tuple, dict, set, frozenset])
self.assertSerializedResultEqual(
[list, tuple, dict, set, frozenset],
("[list, tuple, dict, set, frozenset]", set())
)
def test_serialize_lazy_objects(self):
pattern = re.compile(r'^foo$')
lazy_pattern = SimpleLazyObject(lambda: pattern)
self.assertEqual(self.serialize_round_trip(lazy_pattern), pattern)
def test_serialize_enums(self):
class TextEnum(enum.Enum):
A = 'a-value'
B = 'value-b'
class BinaryEnum(enum.Enum):
A = b'a-value'
B = b'value-b'
class IntEnum(enum.IntEnum):
A = 1
B = 2
self.assertSerializedResultEqual(
TextEnum.A,
("migrations.test_writer.TextEnum('a-value')", {'import migrations.test_writer'})
)
self.assertSerializedResultEqual(
BinaryEnum.A,
("migrations.test_writer.BinaryEnum(b'a-value')", {'import migrations.test_writer'})
)
self.assertSerializedResultEqual(
IntEnum.B,
("migrations.test_writer.IntEnum(2)", {'import migrations.test_writer'})
)
field = models.CharField(default=TextEnum.B, choices=[(m.value, m) for m in TextEnum])
string = MigrationWriter.serialize(field)[0]
self.assertEqual(
string,
"models.CharField(choices=["
"('a-value', migrations.test_writer.TextEnum('a-value')), "
"('value-b', migrations.test_writer.TextEnum('value-b'))], "
"default=migrations.test_writer.TextEnum('value-b'))"
)
field = models.CharField(default=BinaryEnum.B, choices=[(m.value, m) for m in BinaryEnum])
string = MigrationWriter.serialize(field)[0]
self.assertEqual(
string,
"models.CharField(choices=["
"(b'a-value', migrations.test_writer.BinaryEnum(b'a-value')), "
"(b'value-b', migrations.test_writer.BinaryEnum(b'value-b'))], "
"default=migrations.test_writer.BinaryEnum(b'value-b'))"
)
field = models.IntegerField(default=IntEnum.A, choices=[(m.value, m) for m in IntEnum])
string = MigrationWriter.serialize(field)[0]
self.assertEqual(
string,
"models.IntegerField(choices=["
"(1, migrations.test_writer.IntEnum(1)), "
"(2, migrations.test_writer.IntEnum(2))], "
"default=migrations.test_writer.IntEnum(1))"
)
def test_serialize_uuid(self):
self.assertSerializedEqual(uuid.uuid1())
self.assertSerializedEqual(uuid.uuid4())
uuid_a = uuid.UUID('5c859437-d061-4847-b3f7-e6b78852f8c8')
uuid_b = uuid.UUID('c7853ec1-2ea3-4359-b02d-b54e8f1bcee2')
self.assertSerializedResultEqual(
uuid_a,
("uuid.UUID('5c859437-d061-4847-b3f7-e6b78852f8c8')", {'import uuid'})
)
self.assertSerializedResultEqual(
uuid_b,
("uuid.UUID('c7853ec1-2ea3-4359-b02d-b54e8f1bcee2')", {'import uuid'})
)
field = models.UUIDField(choices=((uuid_a, 'UUID A'), (uuid_b, 'UUID B')), default=uuid_a)
string = MigrationWriter.serialize(field)[0]
self.assertEqual(
string,
"models.UUIDField(choices=["
"(uuid.UUID('5c859437-d061-4847-b3f7-e6b78852f8c8'), 'UUID A'), "
"(uuid.UUID('c7853ec1-2ea3-4359-b02d-b54e8f1bcee2'), 'UUID B')], "
"default=uuid.UUID('5c859437-d061-4847-b3f7-e6b78852f8c8'))"
)
def test_serialize_functions(self):
with self.assertRaisesMessage(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))
def test_serialize_datetime(self):
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)
self.assertSerializedEqual(datetime.datetime.now().time())
self.assertSerializedEqual(datetime.datetime(2014, 1, 1, 1, 1, tzinfo=get_default_timezone()))
self.assertSerializedEqual(datetime.datetime(2013, 12, 31, 22, 1, tzinfo=get_fixed_timezone(180)))
self.assertSerializedResultEqual(
datetime.datetime(2014, 1, 1, 1, 1),
("datetime.datetime(2014, 1, 1, 1, 1)", {'import datetime'})
)
self.assertSerializedResultEqual(
datetime.datetime(2012, 1, 1, 1, 1, tzinfo=utc),
(
"datetime.datetime(2012, 1, 1, 1, 1, tzinfo=utc)",
{'import datetime', 'from django.utils.timezone import utc'},
)
)
def test_serialize_fields(self):
self.assertSerializedFieldEqual(models.CharField(max_length=255))
self.assertSerializedResultEqual(
models.CharField(max_length=255),
("models.CharField(max_length=255)", {"from django.db import models"})
)
self.assertSerializedFieldEqual(models.TextField(null=True, blank=True))
self.assertSerializedResultEqual(
models.TextField(null=True, blank=True),
("models.TextField(blank=True, null=True)", {'from django.db import models'})
)
def test_serialize_settings(self):
self.assertSerializedEqual(SettingsReference(settings.AUTH_USER_MODEL, "AUTH_USER_MODEL"))
self.assertSerializedResultEqual(
SettingsReference("someapp.model", "AUTH_USER_MODEL"),
("settings.AUTH_USER_MODEL", {"from django.conf import settings"})
)
def test_serialize_iterators(self):
self.assertSerializedResultEqual(
((x, x * x) for x in range(3)),
("((0, 0), (1, 1), (2, 4))", set())
)
def test_serialize_compiled_regex(self):
"""
Make sure compiled regex can be serialized.
"""
regex = re.compile(r'^\w+$')
self.assertSerializedEqual(regex)
def test_serialize_class_based_validators(self):
"""
Ticket #22943: Test serialization of class-based validators, including
compiled regexes.
"""
validator = RegexValidator(message="hello")
string = MigrationWriter.serialize(validator)[0]
self.assertEqual(string, "django.core.validators.RegexValidator(message='hello')")
self.serialize_round_trip(validator)
# Test with a compiled regex.
validator = RegexValidator(regex=re.compile(r'^\w+$'))
string = MigrationWriter.serialize(validator)[0]
self.assertEqual(string, "django.core.validators.RegexValidator(regex=re.compile('^\\\\w+$'))")
self.serialize_round_trip(validator)
# Test a string regex with flag
validator = RegexValidator(r'^[0-9]+$', flags=re.S)
string = MigrationWriter.serialize(validator)[0]
if PY36:
self.assertEqual(string, "django.core.validators.RegexValidator('^[0-9]+$', flags=re.RegexFlag(16))")
else:
self.assertEqual(string, "django.core.validators.RegexValidator('^[0-9]+$', flags=16)")
self.serialize_round_trip(validator)
# Test message and code
validator = RegexValidator('^[-a-zA-Z0-9_]+$', 'Invalid', 'invalid')
string = MigrationWriter.serialize(validator)[0]
self.assertEqual(string, "django.core.validators.RegexValidator('^[-a-zA-Z0-9_]+$', 'Invalid', 'invalid')")
self.serialize_round_trip(validator)
# Test with a subclass.
validator = EmailValidator(message="hello")
string = MigrationWriter.serialize(validator)[0]
self.assertEqual(string, "django.core.validators.EmailValidator(message='hello')")
self.serialize_round_trip(validator)
validator = deconstructible(path="migrations.test_writer.EmailValidator")(EmailValidator)(message="hello")
string = MigrationWriter.serialize(validator)[0]
self.assertEqual(string, "migrations.test_writer.EmailValidator(message='hello')")
validator = deconstructible(path="custom.EmailValidator")(EmailValidator)(message="hello")
with self.assertRaisesMessage(ImportError, "No module named 'custom'"):
MigrationWriter.serialize(validator)
validator = deconstructible(path="django.core.validators.EmailValidator2")(EmailValidator)(message="hello")
with self.assertRaisesMessage(ValueError, "Could not find object EmailValidator2 in django.core.validators."):
MigrationWriter.serialize(validator)
def test_serialize_empty_nonempty_tuple(self):
"""
Ticket #22679: makemigrations generates invalid code for (an empty
tuple) default_permissions = ()
"""
empty_tuple = ()
one_item_tuple = ('a',)
many_items_tuple = ('a', 'b', 'c')
self.assertSerializedEqual(empty_tuple)
self.assertSerializedEqual(one_item_tuple)
self.assertSerializedEqual(many_items_tuple)
def test_serialize_builtins(self):
string, imports = MigrationWriter.serialize(range)
self.assertEqual(string, 'range')
self.assertEqual(imports, set())
def test_serialize_unbound_method_reference(self):
"""An unbound method used within a class body can be serialized."""
self.serialize_round_trip(TestModel1.thing)
def test_serialize_local_function_reference(self):
"""A reference in a local scope can't be serialized."""
class TestModel2:
def upload_to(self):
return "somewhere dynamic"
thing = models.FileField(upload_to=upload_to)
with self.assertRaisesMessage(ValueError, 'Could not find function upload_to in migrations.test_writer'):
self.serialize_round_trip(TestModel2.thing)
def test_serialize_managers(self):
self.assertSerializedEqual(models.Manager())
self.assertSerializedResultEqual(
FoodQuerySet.as_manager(),
('migrations.models.FoodQuerySet.as_manager()', {'import migrations.models'})
)
self.assertSerializedEqual(FoodManager('a', 'b'))
self.assertSerializedEqual(FoodManager('x', 'y', c=3, d=4))
def test_serialize_frozensets(self):
self.assertSerializedEqual(frozenset())
self.assertSerializedEqual(frozenset("let it go"))
def test_serialize_set(self):
self.assertSerializedEqual(set())
self.assertSerializedResultEqual(set(), ('set()', set()))
self.assertSerializedEqual({'a'})
self.assertSerializedResultEqual({'a'}, ("{'a'}", set()))
def test_serialize_timedelta(self):
self.assertSerializedEqual(datetime.timedelta())
self.assertSerializedEqual(datetime.timedelta(minutes=42))
def test_serialize_functools_partial(self):
value = functools.partial(datetime.timedelta, 1, seconds=2)
result = self.serialize_round_trip(value)
self.assertEqual(result.func, value.func)
self.assertEqual(result.args, value.args)
self.assertEqual(result.keywords, value.keywords)
def test_serialize_functools_partialmethod(self):
value = functools.partialmethod(datetime.timedelta, 1, seconds=2)
result = self.serialize_round_trip(value)
self.assertIsInstance(result, functools.partialmethod)
self.assertEqual(result.func, value.func)
self.assertEqual(result.args, value.args)
self.assertEqual(result.keywords, value.keywords)
def test_simple_migration(self):
"""
Tests serializing a simple migration.
"""
fields = {
'charfield': models.DateTimeField(default=datetime.datetime.utcnow),
'datetimefield': models.DateTimeField(default=datetime.datetime.utcnow),
}
options = {
'verbose_name': 'My model',
'verbose_name_plural': 'My models',
}
migration = type("Migration", (migrations.Migration,), {
"operations": [
migrations.CreateModel("MyModel", tuple(fields.items()), options, (models.Model,)),
migrations.CreateModel("MyModel2", tuple(fields.items()), bases=(models.Model,)),
migrations.CreateModel(
name="MyModel3", fields=tuple(fields.items()), options=options, bases=(models.Model,)
),
migrations.DeleteModel("MyModel"),
migrations.AddField("OtherModel", "datetimefield", fields["datetimefield"]),
],
"dependencies": [("testapp", "some_other_one")],
})
writer = MigrationWriter(migration)
output = writer.as_string()
# 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):
test_apps = [
'migrations.migrations_test_apps.normal',
'migrations.migrations_test_apps.with_package_model',
'migrations.migrations_test_apps.without_init_file',
]
base_dir = os.path.dirname(os.path.dirname(__file__))
for app in test_apps:
with self.modify_settings(INSTALLED_APPS={'append': 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)
def test_custom_operation(self):
migration = type("Migration", (migrations.Migration,), {
"operations": [
custom_migration_operations.operations.TestOperation(),
custom_migration_operations.operations.CreateModel(),
migrations.CreateModel("MyModel", (), {}, (models.Model,)),
custom_migration_operations.more_operations.TestOperation()
],
"dependencies": []
})
writer = MigrationWriter(migration)
output = writer.as_string()
result = self.safe_exec(output)
self.assertIn("custom_migration_operations", result)
self.assertNotEqual(
result['custom_migration_operations'].operations.TestOperation,
result['custom_migration_operations'].more_operations.TestOperation
)
def test_sorted_imports(self):
"""
#24155 - Tests ordering of imports.
"""
migration = type("Migration", (migrations.Migration,), {
"operations": [
migrations.AddField("mymodel", "myfield", models.DateTimeField(
default=datetime.datetime(2012, 1, 1, 1, 1, tzinfo=utc),
)),
]
})
writer = MigrationWriter(migration)
output = writer.as_string()
self.assertIn(
"import datetime\n"
"from django.db import migrations, models\n"
"from django.utils.timezone import utc\n",
output
)
def test_migration_file_header_comments(self):
"""
Test comments at top of file.
"""
migration = type("Migration", (migrations.Migration,), {
"operations": []
})
dt = datetime.datetime(2015, 7, 31, 4, 40, 0, 0, tzinfo=utc)
with mock.patch('django.db.migrations.writer.now', lambda: dt):
writer = MigrationWriter(migration)
output = writer.as_string()
self.assertTrue(
output.startswith(
"# Generated by Django %(version)s on 2015-07-31 04:40\n" % {
'version': get_version(),
}
)
)
def test_models_import_omitted(self):
"""
django.db.models shouldn't be imported if unused.
"""
migration = type("Migration", (migrations.Migration,), {
"operations": [
migrations.AlterModelOptions(
name='model',
options={'verbose_name': 'model', 'verbose_name_plural': 'models'},
),
]
})
writer = MigrationWriter(migration)
output = writer.as_string()
self.assertIn("from django.db import migrations\n", output)
def test_deconstruct_class_arguments(self):
# Yes, it doesn't make sense to use a class as a default for a
# CharField. It does make sense for custom fields though, for example
# an enumfield that takes the enum class as an argument.
class DeconstructibleInstances:
def deconstruct(self):
return ('DeconstructibleInstances', [], {})
string = MigrationWriter.serialize(models.CharField(default=DeconstructibleInstances))[0]
self.assertEqual(string, "models.CharField(default=migrations.test_writer.DeconstructibleInstances)")