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Django.db.utils.ConnectionDoesNotExist:连接默认不存在

我正在尝试使用mongoengine(0.6.0)驱动程序将mongo(v4.0.3)dbdjango(v1.11)连接。显示连接不存在。

我的settings.py文件如下:

import os

import mongoengine

dbname = 'newdb'

mongoengine.connect(dbname, host='127.0.0.1', port = 27017)

BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

SECRET_KEY = ''

DEBUG = True

ALLOWED_HOSTS = []


INSTALLED_APPS = [

    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'mdbcapp',
 ]

 MIDDLEWARE = [

    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
 ]

 ROOT_URLCONF = 'multiple_databses_connections.urls'

 TEMPLATES = [

    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
 ]

 WSGI_APPLICATION = …
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