Django manage.py 测试:“数据库后端不接受 0 作为 AutoField 的值”(mysql)
Django manage.py test: “database backend does not accept 0 as a value for AutoField” (mysql)
我正在尝试 运行 Django 测试文件使用:
python3.6 manage.py test
我使用:MySQL 5.5.62, Python 3.6, Django 2.0.0
它开始安装测试数据库并失败并出现错误:
ValueError: The database backend does not accept 0 as a value for AutoField.
我搜索了这个错误,但我找到的所有主题都与迁移有关,例如 this one。我对迁移没问题,他们 运行 顺利。
回溯:
Traceback (most recent call last):
File "manage.py", line 15, in <module>
execute_from_command_line(sys.argv)
File "/usr/local/lib/python3.6/site-packages/django/core/management/__init__.py", line 371, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python3.6/site-packages/django/core/management/__init__.py", line 365, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/local/lib/python3.6/site-packages/django/core/management/commands/test.py", line 26, in run_from_argv
super().run_from_argv(argv)
File "/usr/local/lib/python3.6/site-packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **cmd_options)
File "/usr/local/lib/python3.6/site-packages/django/core/management/base.py", line 335, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python3.6/site-packages/django/core/management/commands/test.py", line 59, in handle
failures = test_runner.run_tests(test_labels)
File "/usr/local/lib/python3.6/site-packages/django/test/runner.py", line 601, in run_tests
old_config = self.setup_databases()
File "/usr/local/lib/python3.6/site-packages/django/test/runner.py", line 548, in setup_databases
self.parallel, **kwargs
File "/usr/local/lib/python3.6/site-packages/django/test/utils.py", line 176, in setup_databases
serialize=connection.settings_dict.get('TEST', {}).get('SERIALIZE', True),
File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/creation.py", line 68, in create_test_db
run_syncdb=True,
File "/usr/local/lib/python3.6/site-packages/django/core/management/__init__.py", line 141, in call_command
return command.execute(*args, **defaults)
File "/usr/local/lib/python3.6/site-packages/django/core/management/base.py", line 335, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python3.6/site-packages/django/core/management/commands/migrate.py", line 200, in handle
fake_initial=fake_initial,
File "/usr/local/lib/python3.6/site-packages/django/db/migrations/executor.py", line 117, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/usr/local/lib/python3.6/site-packages/django/db/migrations/executor.py", line 147, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/usr/local/lib/python3.6/site-packages/django/db/migrations/executor.py", line 244, in apply_migration
state = migration.apply(state, schema_editor)
File "/usr/local/lib/python3.6/site-packages/django/db/migrations/migration.py", line 122, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/usr/local/lib/python3.6/site-packages/django/db/migrations/operations/fields.py", line 216, in database_forwards
schema_editor.alter_field(from_model, from_field, to_field)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 509, in alter_field
old_db_params, new_db_params, strict)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 613, in _alter_field
old_default = self.effective_default(old_field)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 224, in effective_default
default = field.get_db_prep_save(default, self.connection)
File "/usr/local/lib/python3.6/site-packages/django/db/models/fields/related.py", line 936, in get_db_prep_save
return self.target_field.get_db_prep_save(value, connection=connection)
File "/usr/local/lib/python3.6/site-packages/django/db/models/fields/__init__.py", line 767, in get_db_prep_save
return self.get_db_prep_value(value, connection=connection, prepared=False)
File "/usr/local/lib/python3.6/site-packages/django/db/models/fields/__init__.py", line 940, in get_db_prep_value
value = connection.ops.validate_autopk_value(value)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/mysql/operations.py", line 163, in validate_autopk_value
raise ValueError('The database backend does not accept 0 as a '
ValueError: The database backend does not accept 0 as a value for AutoField.
如何修复此错误和 运行 测试?
好的,看来确实是 @Willem Van Onsem 建议的迁移。我最终删除了迁移并解决了问题。
可能值得指出的是,混乱是由从 Django 模型切换到 Django MTPP 模型并使用 0
作为新添加的 MTPP 字段的默认值以避免该过程中的另一个问题造成的。
我正在尝试 运行 Django 测试文件使用:
python3.6 manage.py test
我使用:MySQL 5.5.62, Python 3.6, Django 2.0.0
它开始安装测试数据库并失败并出现错误:
ValueError: The database backend does not accept 0 as a value for AutoField.
我搜索了这个错误,但我找到的所有主题都与迁移有关,例如 this one。我对迁移没问题,他们 运行 顺利。
回溯:
Traceback (most recent call last):
File "manage.py", line 15, in <module>
execute_from_command_line(sys.argv)
File "/usr/local/lib/python3.6/site-packages/django/core/management/__init__.py", line 371, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python3.6/site-packages/django/core/management/__init__.py", line 365, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/local/lib/python3.6/site-packages/django/core/management/commands/test.py", line 26, in run_from_argv
super().run_from_argv(argv)
File "/usr/local/lib/python3.6/site-packages/django/core/management/base.py", line 288, in run_from_argv
self.execute(*args, **cmd_options)
File "/usr/local/lib/python3.6/site-packages/django/core/management/base.py", line 335, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python3.6/site-packages/django/core/management/commands/test.py", line 59, in handle
failures = test_runner.run_tests(test_labels)
File "/usr/local/lib/python3.6/site-packages/django/test/runner.py", line 601, in run_tests
old_config = self.setup_databases()
File "/usr/local/lib/python3.6/site-packages/django/test/runner.py", line 548, in setup_databases
self.parallel, **kwargs
File "/usr/local/lib/python3.6/site-packages/django/test/utils.py", line 176, in setup_databases
serialize=connection.settings_dict.get('TEST', {}).get('SERIALIZE', True),
File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/creation.py", line 68, in create_test_db
run_syncdb=True,
File "/usr/local/lib/python3.6/site-packages/django/core/management/__init__.py", line 141, in call_command
return command.execute(*args, **defaults)
File "/usr/local/lib/python3.6/site-packages/django/core/management/base.py", line 335, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python3.6/site-packages/django/core/management/commands/migrate.py", line 200, in handle
fake_initial=fake_initial,
File "/usr/local/lib/python3.6/site-packages/django/db/migrations/executor.py", line 117, in migrate
state = self._migrate_all_forwards(state, plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/usr/local/lib/python3.6/site-packages/django/db/migrations/executor.py", line 147, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/usr/local/lib/python3.6/site-packages/django/db/migrations/executor.py", line 244, in apply_migration
state = migration.apply(state, schema_editor)
File "/usr/local/lib/python3.6/site-packages/django/db/migrations/migration.py", line 122, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/usr/local/lib/python3.6/site-packages/django/db/migrations/operations/fields.py", line 216, in database_forwards
schema_editor.alter_field(from_model, from_field, to_field)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 509, in alter_field
old_db_params, new_db_params, strict)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 613, in _alter_field
old_default = self.effective_default(old_field)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/base/schema.py", line 224, in effective_default
default = field.get_db_prep_save(default, self.connection)
File "/usr/local/lib/python3.6/site-packages/django/db/models/fields/related.py", line 936, in get_db_prep_save
return self.target_field.get_db_prep_save(value, connection=connection)
File "/usr/local/lib/python3.6/site-packages/django/db/models/fields/__init__.py", line 767, in get_db_prep_save
return self.get_db_prep_value(value, connection=connection, prepared=False)
File "/usr/local/lib/python3.6/site-packages/django/db/models/fields/__init__.py", line 940, in get_db_prep_value
value = connection.ops.validate_autopk_value(value)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/mysql/operations.py", line 163, in validate_autopk_value
raise ValueError('The database backend does not accept 0 as a '
ValueError: The database backend does not accept 0 as a value for AutoField.
如何修复此错误和 运行 测试?
好的,看来确实是 @Willem Van Onsem 建议的迁移。我最终删除了迁移并解决了问题。
可能值得指出的是,混乱是由从 Django 模型切换到 Django MTPP 模型并使用 0
作为新添加的 MTPP 字段的默认值以避免该过程中的另一个问题造成的。