Django 1.11我们可以在来自两个不同数据库的表之间创建关系吗？

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'database1',
        'USER': 'user1',
        'PASSWORD': 'password1',
        'HOST': 'localhost',
        'PORT': '3306',
    },
    'second_db': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'database2',
        'USER': 'user2',
        'PASSWORD': 'password2',
        'HOST': 'localhost',
        'PORT': '3306',
    }
}

from django.db import models

class Model1(models.Model):
    field1 = models.CharField(max_length=100)
    field2 = models.IntegerField()

class Model2(models.Model):
    field3 = models.CharField(max_length=100)
    field4 = models.ForeignKey(Model1, on_delete=models.CASCADE, using='second_db')