Django多个数据库错误与路由

问题描述：

我在项目中使用了3个数据库:

I'm using 3 databases in my project:

DATABASES = {
    'default': {
        (postgres, read, write)...
    },
    'admission_db': {
        (postgres, read, write)...
    },
    'journals_db': {
        (mysql, read only)...
    }
}
DATABASE_ROUTERS = [
    'main.lib.DbRouter.DbRouter',
]

写数据库路由器:

class DbRouter:
...

    def allow_migrate(self, db, app_label, model=None, **hints):
        if db == 'admission_db':
            if model and model._meta.app_label == 'admission':
                return True
            return app_label == 'admission'
        elif db == 'journals_db':
            return False
        return None

当我执行迁移命令时

python manage.py migrate admission --database admission_db

它可以正常迁移，但是当我尝试制作时

it migrates normally, but when i try to make

python manage.py migrate,

它抛出

django.db.utils.OperationalError: no such table: admission_educationform

因此，我可以在其他应用程序上进行迁移.(python 3.5.2，django 1.10.5)可能是什么原因引起的?

because of it i can make make migrate on other apps. (python 3.5.2, django 1.10.5) what can be cause of problem?

答

添加了对用于magration的数据库的检查:

Added check of db used in magration:

def allow_migrate(self, db, app_label, model=None, **hints):
    if db == 'default':
        if app_label == 'admission':
            return False
        elif model and model._meta.app_label == 'admission':
            return False
    if db == 'admission_db':
        if model and model._meta.app_label == 'admission':
            return True
        return app_label == 'admission'
    elif db == 'journals_db':
        return False
    return None

因此，我应该启动2个迁移命令:

So, i should launch 2 migrate commands:

python migrate admission
python migrate

现在可以正常工作了.

Django多个数据库错误与路由

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