Django 1.7 迁移找不到应用

Django 1.7 migration cannot find app

我正在为应用 Notification 创建数据迁移,在这里我使用来自应用 accounts

的模型 Manager 的引用
Manager = apps.get_model("accounts", "Manager")

它抛出错误:

    self.code(from_state.render(), schema_editor)
  File "/home/notifications/migrations/0004_auto_20150720_0127.py", line 12, in set_notification_setttings
    Manager = apps.get_model("accounts", "Manager")
  File "/home/local/lib/python2.7/site-packages/django/apps/registry.py", line 202, in get_model
    return self.get_app_config(app_label).get_model(model_name.lower())
  File "/home/local/lib/python2.7/site-packages/django/apps/registry.py", line 150, in get_app_config
    raise LookupError("No installed app with label '%s'." % app_label)
LookupError: No installed app with label 'accounts'

尽管从 shell 我尝试了类似的东西并且它起作用了

>> from django.apps import apps
>> apps.get_app_config('accounts').get_model('Manager'.lower())
>> accounts.models.Manager

知道迁移时为什么会失败吗?

您的问题可能已经解决,但其他人可能会遇到这个问题。

如果 Manager 模型不在您创建迁移的同一个应用中,您需要在迁移中添加应用 accounts 的依赖项。示例:

class Migration(migrations.Migration):
    dependencies = [
        ('Current_App_Name', 'XYZ_Last_Migration_of_App'),
        ('accounts', '0012_auto_XYZ'),
        ...,
    ]`
    ...