mysql - 在django中使用多个数据库并获取表不存在错误

Question

我在 django 中有以下数据库设置:

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql', 
      'NAME': 'default_db',
    },
    'otherdb': {
        'ENGINE': 'django.db.backends.mysql', 
      'NAME': 'other_db',
    }
}

默认模型是:

class Notification(models.Model):

otherdb模型是:

class Entity(models.Model):

在我看来，我的代码只是这样做:

entities = Entity.objects.get(pk=pk)

    for entity in entities:
        print entity

根据 django 文档，django 将为您完成数据库路由。我有两个数据库的模型。当我运行这个时，我收到一个错误:

1146, "Table 'default_db.Entity' doesn't exist"

它应该寻找 other_db.Entity

我需要做些什么才能使路由发生在我的 ec2 实例上吗？

Answer 1

我重写了路由类，如下所述:

https://docs.djangoproject.com/en/dev/topics/db/multi-db/#topics-db-multi-db-hints

我使用了以下函数:

class AuthRouter(object):
    """
    A router to control all database operations on models in the
    auth application.
    """
    def db_for_read(self, model, **hints):
        """
        Attempts to read auth models go to auth_db.
        """
        if model._meta.app_label == 'auth':
            return 'auth_db'
        return None

    def db_for_write(self, model, **hints):
        """
        Attempts to write auth models go to auth_db.
        """
        if model._meta.app_label == 'auth':
            return 'auth_db'
        return None