apps.py 文件源码

def check_installed_before_admin(app_configs=None, **kwargs):
    """
    If `django.contrib.admin` is also installed, we must be installed before it.

    Is this even true anymore?
    """
    from django.conf import settings

    errors = []

    if 'django.contrib.admin' in settings.INSTALLED_APPS:
        admin = settings.INSTALLED_APPS.index('django.contrib.admin')
        local = settings.INSTALLED_APPS.index('boardinghouse')
        if admin < local:
            errors.append(Error(
                "boardinghouse must be installed prior to 'django.contrib.admin'",
                id='boardinghouse.E004',
            ))

    return errors