将读取副本分配给Django中的特定应用程序？

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'mydatabase',
        'USER': 'myuser',
        'PASSWORD': 'mypassword',
        'HOST': 'localhost',
        'PORT': '3306',
    },
    'replica1': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'mydatabase',
        'USER': 'myuser',
        'PASSWORD': 'mypassword',
        'HOST': 'replica1.example.com',
        'PORT': '3306',
    },
    'replica2': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'mydatabase',
        'USER': 'myuser',
        'PASSWORD': 'mypassword',
        'HOST': 'replica2.example.com',
        'PORT': '3306',
    },
}

class AppRouter:
    def db_for_read(self, model, **hints):
        if model._meta.app_label == 'myapp':
            return 'replica1'
        return 'default'

    def db_for_write(self, model, **hints):
        return 'default'

DATABASE_ROUTERS = ['myproject.myapp.AppRouter']