mirror of
https://github.com/django/django.git
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645 lines
26 KiB
Python
645 lines
26 KiB
Python
# -*- coding: utf-8 -*-
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from __future__ import unicode_literals
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import datetime
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import functools
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import math
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import os
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import re
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import tokenize
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import unittest
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import custom_migration_operations.more_operations
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import custom_migration_operations.operations
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from django import get_version
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from django.conf import settings
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from django.core.validators import EmailValidator, RegexValidator
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from django.db import migrations, models
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from django.db.migrations.writer import (
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MigrationWriter, OperationWriter, SettingsReference,
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)
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from django.test import SimpleTestCase, ignore_warnings, mock
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from django.utils import datetime_safe, six
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from django.utils._os import upath
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from django.utils.deconstruct import deconstructible
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from django.utils.functional import SimpleLazyObject
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from django.utils.timezone import FixedOffset, get_default_timezone, utc
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from django.utils.translation import ugettext_lazy as _
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from .models import FoodManager, FoodQuerySet
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try:
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import enum
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except ImportError:
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enum = None
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class TestModel1(object):
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def upload_to(self):
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return "somewhere dynamic"
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thing = models.FileField(upload_to=upload_to)
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class OperationWriterTests(SimpleTestCase):
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def test_empty_signature(self):
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operation = custom_migration_operations.operations.TestOperation()
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buff, imports = OperationWriter(operation, indentation=0).serialize()
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self.assertEqual(imports, {'import custom_migration_operations.operations'})
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self.assertEqual(
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buff,
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'custom_migration_operations.operations.TestOperation(\n'
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'),'
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)
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def test_args_signature(self):
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operation = custom_migration_operations.operations.ArgsOperation(1, 2)
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buff, imports = OperationWriter(operation, indentation=0).serialize()
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self.assertEqual(imports, {'import custom_migration_operations.operations'})
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self.assertEqual(
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buff,
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'custom_migration_operations.operations.ArgsOperation(\n'
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' arg1=1,\n'
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' arg2=2,\n'
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'),'
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)
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def test_kwargs_signature(self):
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operation = custom_migration_operations.operations.KwargsOperation(kwarg1=1)
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buff, imports = OperationWriter(operation, indentation=0).serialize()
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self.assertEqual(imports, {'import custom_migration_operations.operations'})
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self.assertEqual(
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buff,
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'custom_migration_operations.operations.KwargsOperation(\n'
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' kwarg1=1,\n'
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'),'
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)
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def test_args_kwargs_signature(self):
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operation = custom_migration_operations.operations.ArgsKwargsOperation(1, 2, kwarg2=4)
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buff, imports = OperationWriter(operation, indentation=0).serialize()
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self.assertEqual(imports, {'import custom_migration_operations.operations'})
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self.assertEqual(
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buff,
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'custom_migration_operations.operations.ArgsKwargsOperation(\n'
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' arg1=1,\n'
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' arg2=2,\n'
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' kwarg2=4,\n'
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'),'
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)
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def test_nested_args_signature(self):
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operation = custom_migration_operations.operations.ArgsOperation(
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custom_migration_operations.operations.ArgsOperation(1, 2),
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custom_migration_operations.operations.KwargsOperation(kwarg1=3, kwarg2=4)
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)
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buff, imports = OperationWriter(operation, indentation=0).serialize()
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self.assertEqual(imports, {'import custom_migration_operations.operations'})
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self.assertEqual(
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buff,
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'custom_migration_operations.operations.ArgsOperation(\n'
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' arg1=custom_migration_operations.operations.ArgsOperation(\n'
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' arg1=1,\n'
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' arg2=2,\n'
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' ),\n'
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' arg2=custom_migration_operations.operations.KwargsOperation(\n'
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' kwarg1=3,\n'
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' kwarg2=4,\n'
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' ),\n'
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'),'
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)
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def test_multiline_args_signature(self):
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operation = custom_migration_operations.operations.ArgsOperation("test\n arg1", "test\narg2")
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buff, imports = OperationWriter(operation, indentation=0).serialize()
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self.assertEqual(imports, {'import custom_migration_operations.operations'})
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self.assertEqual(
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buff,
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"custom_migration_operations.operations.ArgsOperation(\n"
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" arg1='test\\n arg1',\n"
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" arg2='test\\narg2',\n"
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"),"
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)
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def test_expand_args_signature(self):
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operation = custom_migration_operations.operations.ExpandArgsOperation([1, 2])
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buff, imports = OperationWriter(operation, indentation=0).serialize()
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self.assertEqual(imports, {'import custom_migration_operations.operations'})
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self.assertEqual(
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buff,
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'custom_migration_operations.operations.ExpandArgsOperation(\n'
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' arg=[\n'
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' 1,\n'
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' 2,\n'
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' ],\n'
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'),'
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)
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def test_nested_operation_expand_args_signature(self):
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operation = custom_migration_operations.operations.ExpandArgsOperation(
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arg=[
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custom_migration_operations.operations.KwargsOperation(
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kwarg1=1,
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kwarg2=2,
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),
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]
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)
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buff, imports = OperationWriter(operation, indentation=0).serialize()
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self.assertEqual(imports, {'import custom_migration_operations.operations'})
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self.assertEqual(
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buff,
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'custom_migration_operations.operations.ExpandArgsOperation(\n'
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' arg=[\n'
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' custom_migration_operations.operations.KwargsOperation(\n'
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' kwarg1=1,\n'
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' kwarg2=2,\n'
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' ),\n'
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' ],\n'
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'),'
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)
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class WriterTests(SimpleTestCase):
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"""
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Tests the migration writer (makes migration files from Migration instances)
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"""
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def safe_exec(self, string, value=None):
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l = {}
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try:
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exec(string, globals(), l)
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except Exception as e:
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if value:
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self.fail("Could not exec %r (from value %r): %s" % (string.strip(), value, e))
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else:
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self.fail("Could not exec %r: %s" % (string.strip(), e))
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return l
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def serialize_round_trip(self, value):
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string, imports = MigrationWriter.serialize(value)
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return self.safe_exec("%s\ntest_value_result = %s" % ("\n".join(imports), string), value)['test_value_result']
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def assertSerializedEqual(self, value):
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self.assertEqual(self.serialize_round_trip(value), value)
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def assertSerializedResultEqual(self, value, target):
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self.assertEqual(MigrationWriter.serialize(value), target)
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def assertSerializedFieldEqual(self, value):
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new_value = self.serialize_round_trip(value)
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self.assertEqual(value.__class__, new_value.__class__)
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self.assertEqual(value.max_length, new_value.max_length)
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self.assertEqual(value.null, new_value.null)
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self.assertEqual(value.unique, new_value.unique)
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def test_serialize_numbers(self):
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self.assertSerializedEqual(1)
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self.assertSerializedEqual(1.2)
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self.assertTrue(math.isinf(self.serialize_round_trip(float("inf"))))
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self.assertTrue(math.isinf(self.serialize_round_trip(float("-inf"))))
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self.assertTrue(math.isnan(self.serialize_round_trip(float("nan"))))
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def test_serialize_constants(self):
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self.assertSerializedEqual(None)
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self.assertSerializedEqual(True)
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self.assertSerializedEqual(False)
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def test_serialize_strings(self):
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self.assertSerializedEqual(b"foobar")
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string, imports = MigrationWriter.serialize(b"foobar")
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self.assertEqual(string, "b'foobar'")
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self.assertSerializedEqual("föobár")
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string, imports = MigrationWriter.serialize("foobar")
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self.assertEqual(string, "'foobar'")
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def test_serialize_multiline_strings(self):
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self.assertSerializedEqual(b"foo\nbar")
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string, imports = MigrationWriter.serialize(b"foo\nbar")
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self.assertEqual(string, "b'foo\\nbar'")
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self.assertSerializedEqual("föo\nbár")
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string, imports = MigrationWriter.serialize("foo\nbar")
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self.assertEqual(string, "'foo\\nbar'")
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def test_serialize_collections(self):
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self.assertSerializedEqual({1: 2})
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self.assertSerializedEqual(["a", 2, True, None])
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self.assertSerializedEqual({2, 3, "eighty"})
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self.assertSerializedEqual({"lalalala": ["yeah", "no", "maybe"]})
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self.assertSerializedEqual(_('Hello'))
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def test_serialize_builtin_types(self):
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self.assertSerializedEqual([list, tuple, dict, set, frozenset])
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self.assertSerializedResultEqual(
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[list, tuple, dict, set, frozenset],
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("[list, tuple, dict, set, frozenset]", set())
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)
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def test_serialize_lazy_objects(self):
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pattern = re.compile(r'^foo$', re.UNICODE)
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lazy_pattern = SimpleLazyObject(lambda: pattern)
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self.assertEqual(self.serialize_round_trip(lazy_pattern), pattern)
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@unittest.skipUnless(enum, "enum34 is required on Python 2")
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def test_serialize_enums(self):
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class TextEnum(enum.Enum):
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A = 'a-value'
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B = 'value-b'
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class BinaryEnum(enum.Enum):
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A = b'a-value'
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B = b'value-b'
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class IntEnum(enum.IntEnum):
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A = 1
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B = 2
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self.assertSerializedResultEqual(
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TextEnum.A,
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("migrations.test_writer.TextEnum('a-value')", {'import migrations.test_writer'})
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)
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self.assertSerializedResultEqual(
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BinaryEnum.A,
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("migrations.test_writer.BinaryEnum(b'a-value')", {'import migrations.test_writer'})
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)
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self.assertSerializedResultEqual(
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IntEnum.B,
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("migrations.test_writer.IntEnum(2)", {'import migrations.test_writer'})
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)
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field = models.CharField(default=TextEnum.B, choices=[(m.value, m) for m in TextEnum])
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string = MigrationWriter.serialize(field)[0]
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self.assertEqual(
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string,
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"models.CharField(choices=["
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"('a-value', migrations.test_writer.TextEnum('a-value')), "
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"('value-b', migrations.test_writer.TextEnum('value-b'))], "
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"default=migrations.test_writer.TextEnum('value-b'))"
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)
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field = models.CharField(default=BinaryEnum.B, choices=[(m.value, m) for m in BinaryEnum])
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string = MigrationWriter.serialize(field)[0]
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self.assertEqual(
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string,
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"models.CharField(choices=["
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"(b'a-value', migrations.test_writer.BinaryEnum(b'a-value')), "
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"(b'value-b', migrations.test_writer.BinaryEnum(b'value-b'))], "
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"default=migrations.test_writer.BinaryEnum(b'value-b'))"
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)
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field = models.IntegerField(default=IntEnum.A, choices=[(m.value, m) for m in IntEnum])
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string = MigrationWriter.serialize(field)[0]
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self.assertEqual(
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string,
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"models.IntegerField(choices=["
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"(1, migrations.test_writer.IntEnum(1)), "
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"(2, migrations.test_writer.IntEnum(2))], "
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"default=migrations.test_writer.IntEnum(1))"
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)
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def test_serialize_functions(self):
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with self.assertRaisesMessage(ValueError, 'Cannot serialize function: lambda'):
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self.assertSerializedEqual(lambda x: 42)
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self.assertSerializedEqual(models.SET_NULL)
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string, imports = MigrationWriter.serialize(models.SET(42))
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self.assertEqual(string, 'models.SET(42)')
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self.serialize_round_trip(models.SET(42))
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def test_serialize_datetime(self):
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self.assertSerializedEqual(datetime.datetime.utcnow())
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self.assertSerializedEqual(datetime.datetime.utcnow)
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self.assertSerializedEqual(datetime.datetime.today())
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self.assertSerializedEqual(datetime.datetime.today)
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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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self.assertSerializedEqual(datetime.datetime(2014, 1, 1, 1, 1, tzinfo=get_default_timezone()))
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self.assertSerializedEqual(datetime.datetime(2013, 12, 31, 22, 1, tzinfo=FixedOffset(180)))
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self.assertSerializedResultEqual(
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datetime.datetime(2014, 1, 1, 1, 1),
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("datetime.datetime(2014, 1, 1, 1, 1)", {'import datetime'})
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)
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self.assertSerializedResultEqual(
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datetime.datetime(2012, 1, 1, 1, 1, tzinfo=utc),
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(
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"datetime.datetime(2012, 1, 1, 1, 1, tzinfo=utc)",
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{'import datetime', 'from django.utils.timezone import utc'},
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)
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)
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def test_serialize_datetime_safe(self):
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self.assertSerializedResultEqual(
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datetime_safe.date(2014, 3, 31),
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("datetime.date(2014, 3, 31)", {'import datetime'})
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)
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self.assertSerializedResultEqual(
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datetime_safe.time(10, 25),
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("datetime.time(10, 25)", {'import datetime'})
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)
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self.assertSerializedResultEqual(
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datetime_safe.datetime(2014, 3, 31, 16, 4, 31),
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("datetime.datetime(2014, 3, 31, 16, 4, 31)", {'import datetime'})
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)
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def test_serialize_fields(self):
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self.assertSerializedFieldEqual(models.CharField(max_length=255))
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self.assertSerializedResultEqual(
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models.CharField(max_length=255),
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("models.CharField(max_length=255)", {"from django.db import models"})
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)
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self.assertSerializedFieldEqual(models.TextField(null=True, blank=True))
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self.assertSerializedResultEqual(
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models.TextField(null=True, blank=True),
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("models.TextField(blank=True, null=True)", {'from django.db import models'})
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)
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def test_serialize_settings(self):
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self.assertSerializedEqual(SettingsReference(settings.AUTH_USER_MODEL, "AUTH_USER_MODEL"))
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self.assertSerializedResultEqual(
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SettingsReference("someapp.model", "AUTH_USER_MODEL"),
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("settings.AUTH_USER_MODEL", {"from django.conf import settings"})
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)
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def test_serialize_iterators(self):
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self.assertSerializedResultEqual(
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((x, x * x) for x in range(3)),
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("((0, 0), (1, 1), (2, 4))", set())
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)
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def test_serialize_compiled_regex(self):
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"""
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Make sure compiled regex can be serialized.
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"""
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regex = re.compile(r'^\w+$', re.U)
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self.assertSerializedEqual(regex)
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def test_serialize_class_based_validators(self):
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"""
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Ticket #22943: Test serialization of class-based validators, including
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compiled regexes.
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"""
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validator = RegexValidator(message="hello")
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string = MigrationWriter.serialize(validator)[0]
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self.assertEqual(string, "django.core.validators.RegexValidator(message='hello')")
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self.serialize_round_trip(validator)
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# Test with a compiled regex.
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validator = RegexValidator(regex=re.compile(r'^\w+$', re.U))
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string = MigrationWriter.serialize(validator)[0]
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self.assertEqual(string, "django.core.validators.RegexValidator(regex=re.compile('^\\\\w+$', 32))")
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self.serialize_round_trip(validator)
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# Test a string regex with flag
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validator = RegexValidator(r'^[0-9]+$', flags=re.U)
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string = MigrationWriter.serialize(validator)[0]
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self.assertEqual(string, "django.core.validators.RegexValidator('^[0-9]+$', flags=32)")
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self.serialize_round_trip(validator)
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# Test message and code
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validator = RegexValidator('^[-a-zA-Z0-9_]+$', 'Invalid', 'invalid')
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string = MigrationWriter.serialize(validator)[0]
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self.assertEqual(string, "django.core.validators.RegexValidator('^[-a-zA-Z0-9_]+$', 'Invalid', 'invalid')")
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self.serialize_round_trip(validator)
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# Test with a subclass.
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validator = EmailValidator(message="hello")
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string = MigrationWriter.serialize(validator)[0]
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self.assertEqual(string, "django.core.validators.EmailValidator(message='hello')")
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self.serialize_round_trip(validator)
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validator = deconstructible(path="migrations.test_writer.EmailValidator")(EmailValidator)(message="hello")
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string = MigrationWriter.serialize(validator)[0]
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self.assertEqual(string, "migrations.test_writer.EmailValidator(message='hello')")
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validator = deconstructible(path="custom.EmailValidator")(EmailValidator)(message="hello")
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with six.assertRaisesRegex(self, ImportError, "No module named '?custom'?"):
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MigrationWriter.serialize(validator)
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validator = deconstructible(path="django.core.validators.EmailValidator2")(EmailValidator)(message="hello")
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with self.assertRaisesMessage(ValueError, "Could not find object EmailValidator2 in django.core.validators."):
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MigrationWriter.serialize(validator)
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def test_serialize_empty_nonempty_tuple(self):
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"""
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Ticket #22679: makemigrations generates invalid code for (an empty
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tuple) default_permissions = ()
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"""
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empty_tuple = ()
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one_item_tuple = ('a',)
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many_items_tuple = ('a', 'b', 'c')
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self.assertSerializedEqual(empty_tuple)
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self.assertSerializedEqual(one_item_tuple)
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self.assertSerializedEqual(many_items_tuple)
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def test_serialize_builtins(self):
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string, imports = MigrationWriter.serialize(range)
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self.assertEqual(string, 'range')
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self.assertEqual(imports, set())
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@unittest.skipUnless(six.PY2, "Only applies on Python 2")
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def test_serialize_direct_function_reference(self):
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"""
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Ticket #22436: You cannot use a function straight from its body
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(e.g. define the method and use it in the same body)
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"""
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with self.assertRaises(ValueError):
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self.serialize_round_trip(TestModel1.thing)
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def test_serialize_local_function_reference(self):
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"""
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Neither py2 or py3 can serialize a reference in a local scope.
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"""
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class TestModel2(object):
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def upload_to(self):
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return "somewhere dynamic"
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thing = models.FileField(upload_to=upload_to)
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with self.assertRaises(ValueError):
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self.serialize_round_trip(TestModel2.thing)
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def test_serialize_local_function_reference_message(self):
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"""
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Make sure user is seeing which module/function is the issue
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"""
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class TestModel2(object):
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def upload_to(self):
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return "somewhere dynamic"
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thing = models.FileField(upload_to=upload_to)
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|
|
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_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_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(str("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()
|
|
# 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)
|
|
# In order to preserve compatibility with Python 3.2 unicode literals
|
|
# prefix shouldn't be added to strings.
|
|
tokens = tokenize.generate_tokens(six.StringIO(str(output)).readline)
|
|
for token_type, token_source, (srow, scol), __, line in tokens:
|
|
if token_type == tokenize.STRING:
|
|
self.assertFalse(
|
|
token_source.startswith('u'),
|
|
"Unicode literal prefix found at %d:%d: %r" % (
|
|
srow, scol, line.strip()
|
|
)
|
|
)
|
|
|
|
# Silence warning on Python 2: Not importing directory
|
|
# 'tests/migrations/migrations_test_apps/without_init_file/migrations':
|
|
# missing __init__.py
|
|
@ignore_warnings(category=ImportWarning)
|
|
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(upath(__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(str("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(str("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().decode('utf-8')
|
|
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(str("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().decode('utf-8')
|
|
|
|
self.assertTrue(
|
|
output.startswith(
|
|
"# -*- coding: utf-8 -*-\n"
|
|
"# 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(str("Migration"), (migrations.Migration,), {
|
|
"operations": [
|
|
migrations.AlterModelOptions(
|
|
name='model',
|
|
options={'verbose_name': 'model', 'verbose_name_plural': 'models'},
|
|
),
|
|
]
|
|
})
|
|
writer = MigrationWriter(migration)
|
|
output = writer.as_string().decode('utf-8')
|
|
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(object):
|
|
def deconstruct(self):
|
|
return ('DeconstructibleInstances', [], {})
|
|
|
|
string = MigrationWriter.serialize(models.CharField(default=DeconstructibleInstances))[0]
|
|
self.assertEqual(string, "models.CharField(default=migrations.test_writer.DeconstructibleInstances)")
|