Question

在我的django项目中，我有一些数据库连接：

例如

DATABASES = {
    "default": {
        "ENGINE": "django.db.backends.postgresql_psycopg2",
        "NAME": "awesome",
        ...
    },
    "other_1": {
        "ENGINE": "django.db.backends.postgresql_psycopg2",
        "NAME": "other_1",
        "TEST": {"MIRROR": default}
        ...
    },
    "other_2": {
        "ENGINE": "django.db.backends.mysql",
        "NAME": "other_2",
        "TEST": {"MIRROR": default}
    }
}

注意：

default和other_1都是postgres的后端， other_2是mysql的后端。
我将"TEST": {"MIRROR": default}添加到了额外的数据库配置中，以避免在测试期间创建这些数据库。参见此link。

问题：

运行测试时，它抱怨Unknown database 'test_awesome'，堆栈跟踪显示它来自MYSQL后端：

Traceback (most recent call last):
  File "/Users/jlin/virtualenvs/awesome-1SH6mAZ2/lib/python3.6/site-packages/django/test/testcases.py", line 1005, in setUpClass
    if not connections_support_transactions():
  File "/Users/jlin/virtualenvs/awesome-1SH6mAZ2/lib/python3.6/site-packages/django/test/testcases.py", line 970, in connections_support_transactions
...
File "/Users/jlin/virtualenvs/awesome-1SH6mAZ2/lib/python3.6/site-packages/MySQLdb/__init__.py", line 85, in Connect
    return Connection(*args, **kwargs)
  File "/Users/jlin/virtualenvs/awesome-1SH6mAZ2/lib/python3.6/site-packages/MySQLdb/connections.py", line 204, in __init__
    super(Connection, self).__init__(*args, **kwargs2)
django.db.utils.OperationalError: (1049, "Unknown database 'test_awesome'")

如果我注释掉other_2连接，则测试运行正常。

Answer 1

看起来问题出在后端吗？

我钻入了setup_database code，如果我从other_2字典中删除了mirrored_aliases，那么我的测试代码就可以正常工作。

所以我创建了一个测试运行器类来删除other_2连接，因为它太深了，无法从mirriored_aliases中删除。

class TestRunner(DiscoverRunner):
    def setup_databases(self, **kwargs):
        # to get around this problem
        # https://stackoverflow.com/questions/54189925/django-external-mysql-db-connection-in-test-complains-unknown-database
        settings.DATABASES.pop('other_2', None)
        return super(TestRunner, self).setup_databases(**kwargs)

测试中的Django外部mysql db连接抱怨“未知数据库”

1 个答案: