Question

内部版本：Heroku Python服务器，Postgresql 10.4，Django 2，Wagtail 2.1

我正在尝试从本质上销毁并重新创建我的应用程序数据库。这是我遵循的步骤：

创建数据库转储（成功）
rm所有迁移并重新创建“初始”迁移（成功）
运行“ heroku pg：重置数据库”（成功）
推送新的迁移和数据库转储（成功）
运行“ heroku运行python manage.py migration”（成功）
运行`heroku运行python manage.py flush`（**失败**）

JVsquad$ heroku run python manage.py flush
Running python manage.py flush on ⬢ my_app... up, run.2459 (Hobby)
You have requested a flush of the database.
This will IRREVERSIBLY DESTROY all data currently in the 'my_app_db' database,
and return each table to an empty state.
Are you sure you want to do this?

    Type 'yes' to continue, or 'no' to cancel: yes
CommandError: Database my_app_db couldn't be flushed. Possible 
reasons:
  * The database isn't running or isn't configured correctly.
  * At least one of the expected database tables doesn't exist.
  * The SQL was invalid.
Hint: Look at the output of 'django-admin sqlflush'. That's the SQL this command wasn't able to run.

我的第7步将是heroku run python manage.py loaddata db_dump.json，但也失败了，因为冲洗不起作用。

请帮助

Answer 1

如果没有任何效果，则可以从heroku GUI删除数据库并置备新数据库。这样可以解决您眼前的问题。

此外，该主题提出了解决方案

https://github.com/wagtail/wagtail/issues/1824

Answer 2

从Mysql迁移到PostgresQL之后，我遇到了同样的问题。

TRUNCATE tablename CASCADE的问题在于我无法在flush方法（在每个测试用例方法之后运行）中设置allow_cascade=True

我覆盖了测试中使用的Transaction类：APITransactionTestCase

class PostgresTestCase(APITransactionTestCase):
"""
Override APITransactionTestCase class so the TRUNCATE table_name CASCADE is enabled

"""
def _fixture_teardown(self):

    # Allow TRUNCATE ... CASCADE and dont emit the post_migrate signal
    # when flushing only a subset of the apps
    for db_name in self._databases_names(include_mirrors=False):
        # Flush the database
        inhibit_post_migrate = (
                self.available_apps is not None or
                (  # Inhibit the post_migrate signal when using serialized
                    # rollback to avoid trying to recreate the serialized data.
                        self.serialized_rollback and
                        hasattr(connections[db_name], '_test_serialized_contents')
                )
        )
        call_command('flush', verbosity=3, interactive=False,
                     database=db_name, reset_sequences=False,
                     allow_cascade=True,
                     inhibit_post_migrate=True)

现在冲洗功能也可以在Postgres中使用。

Django / PostgreSQL manage.py刷新错误。看看'django-admin sqlflush'的输出

2 个答案: