Django TestCase未在辅助数据库上使用事务 [英] Django TestCase not using transactions on secondary database

问题描述

我正在使用Django 1.3.1。我有两个数据库，我的某些模型位于一个数据库中，而另一些模型则位于另一个数据库中。这两个数据库都是contrib.gis.db.backends.postgis数据库。

I am using Django 1.3.1. I have two databases, some of my models live in one database, some in the other. Both databases are contrib.gis.db.backends.postgis databases.

令我惊讶的是，Django的TestCase没有回滚我在两次测试之间在二级数据库中所做的更改。

To my surprise, Django's TestCase isn't rolling back changes I made in the secondary database between tests.

在以下代码中，myproject.models.WellOwner是一个非常简单的模型，基本上只有一个字段 name。路由器说它应该在辅助数据库中。第一个测试中的断言成功，第二个测试中的失败：

In the following code, myproject.models.WellOwner is a very simple model that basically only has a field "name". The router says that it should be in the secondary database. The assertion in the first test succeeds, the second test fails:

from django.test import TestCase
from myproject.models import WellOwner

class SimpleTest(TestCase):
    def test1(self):
        WellOwner.objects.create(name="Remco")
        self.assertEquals(1, WellOwner.objects.count())  # Succeeds

class SimpleTest2(TestCase):
    def test2(self):
        # I would expect to have an empty database at this point
        self.assertEquals(0, WellOwner.objects.count())  # Fails!

我假设Django将其包装在默认数据库中的事务中，而不是在辅助数据库中。这是一个已知问题吗？有解决办法吗？在1.4中？我的Google-fu失败了。

I assume that Django wraps this in a transaction on the default database, but not on the secondary database. Is this a known problem? Is there a fix? In 1.4 perhaps? My Google-fu is failing.

（如果我在设置中将DATABASE_ROUTERS更改为[]，以便所有内容都进入同一个数据库，问题就消失了）

(if I change DATABASE_ROUTERS to [] in settings so that everything goes into the same database, the problem disappears)

我将添加路由器的整个代码，以防出现问题：

I'll add the whole code of the router, in case it helps:

SECONDARY_MODELS = ('WellOwner', ...)

import logging
logger = logging.getLogger(__name__)


class GmdbRouter(object):
    """Keep some models in a secondary database."""

    def db_for_read(self, model, **hints):
        if model._meta.app_label == 'gmdb':
            if model._meta.object_name in SECONDARY_MODELS:
                return 'secondary'

        return None

    def db_for_write(self, model, **hints):
        # Same criteria as for reading
        return self.db_for_read(model, **hints)

    def allow_syncdb(self, db, model):
        if db == 'secondary':
            if model._meta.app_label in ('sites', 'south'):
                # Hack for bug https://code.djangoproject.com/ticket/16353
                # When testing, create django_site and south in both databases
                return True

            return self.db_for_read(model) == 'secondary'
        else:
            # Some other db
            if model._meta.app_label == 'gmdb':
                # Our models go in the other db if they don't go into secondary
                return self.db_for_read(model) != 'secondary'

            # Some other model in some other db, no opinion
            return None

推荐答案

尝试一下：

class MyTestCase(TestCase):
    multi_db = True

https://docs.djangoproject.com/zh-CN/1.2/topics/testing/#django.test.Test Case.multi_db

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