Django代理模型到不同的数据库

正如@hynekcer所说,如果kayakodb是现有数据库,则需要managed = False为其所有模型进行设置.但是,这仍然会导致在错误的app(kayakodb)内创建的代理模型的迁移问题.

可能有用的hacky修复方法是将app_label代理模型更改为任何可以迁移的应用程序(sidebar在本例中),并创建一个指向此代理模型的读取和写入的路由器kayakodb.

例如代理模型:

# in sidebar/models.py

class SidebarTicket(KayakoTicket):
    class Meta:
        proxy = True
        app_label = 'sidebar'

以及使用它的项目中的路由器:

from django.conf import settings
from kayakodb.models import Ticket

class ProxyDatabaseRouter(object):
    def allow_proxy_to_different_db(self, obj_):
        # check if this is a sidebar proxy to the Ticket model in kayakodb
        return isinstance(obj_, Ticket) and obj_._meta.proxy and obj_._meta.app_label == 'sidebar'

    def db_for_read(self, model, **hints):
        if issubclass(model, Ticket) and model._meta.proxy and model._meta.app_label == 'sidebar':
            return 'kayakodb'
        # the rest of the method goes here

    def db_for_write(self, model, **hints):
        if issubclass(model, Ticket) and model._meta.proxy and model._meta.app_label == 'sidebar':
            return 'kayakodb'
        return None
        # the rest of the method goes here

    def allow_relation(self, obj1, obj2, **hints):
        if self.allow_proxy_to_different_db(obj1) or self.allow_proxy_to_different_db(obj2):
            return True
        # the rest of the method goes here