如何从Django 1.10（python3.4）和pymongo v3.4连接到MongoDB v2.6.12？

Question

我是新来的Django，和我建立了一个mysites应用程序中使用使用mongoengine

但是教程given here

我跟着this guide与Django的建立的MongoDB，我不断收到以下错误每次我尝试运行服务器：

(myVirtEnv_1) [root@sandbox1 django-mongoadmin]# python mysite/manage.py runserver 99 
Traceback (most recent call last): 
    File "/root/blrasp/myVirtEnv_1/lib/python3.4/site-packages/mongoengine/connection.py", line 124, in get_connection 
    _connections[alias] = connection if connection else connection_class(**conn_settings) 
    File "/root/blrasp/myVirtEnv_1/lib/python3.4/site-packages/pymongo/mongo_client.py", line 422, in __init__ 
    for k, v in keyword_opts.items()) 
    File "/root/blrasp/myVirtEnv_1/lib/python3.4/site-packages/pymongo/mongo_client.py", line 422, in <genexpr> 
    for k, v in keyword_opts.items()) 
    File "/root/blrasp/myVirtEnv_1/lib/python3.4/site-packages/pymongo/common.py", line 539, in validate 
    value = validator(option, value) 
    File "/root/blrasp/myVirtEnv_1/lib/python3.4/site-packages/pymongo/common.py", line 301, in validate_read_preference 
    raise TypeError("%r is not a read preference." % (value,)) 
TypeError: False is not a read preference. 

During handling of the above exception, another exception occurred: 

Traceback (most recent call last): 
    File "mysite/manage.py", line 22, in <module> 
    execute_from_command_line(sys.argv) 
    File "/root/blrasp/myVirtEnv_1/lib/python3.4/site-packages/django/core/management/__init__.py", line 367, in execute_from_command_line 
    utility.execute() 
    File "/root/blrasp/myVirtEnv_1/lib/python3.4/site-packages/django/core/management/__init__.py", line 316, in execute 
    settings.INSTALLED_APPS 
    File "/root/blrasp/myVirtEnv_1/lib/python3.4/site-packages/django/conf/__init__.py", line 53, in __getattr__ 
    self._setup(name) 
    File "/root/blrasp/myVirtEnv_1/lib/python3.4/site-packages/django/conf/__init__.py", line 41, in _setup 
    self._wrapped = Settings(settings_module) 
    File "/root/blrasp/myVirtEnv_1/lib/python3.4/site-packages/django/conf/__init__.py", line 97, in __init__ 
    mod = importlib.import_module(self.SETTINGS_MODULE) 
    File "/root/blrasp/myVirtEnv_1/lib64/python3.4/importlib/__init__.py", line 109, in import_module 
    return _bootstrap._gcd_import(name[level:], package, level) 
    File "<frozen importlib._bootstrap>", line 2254, in _gcd_import 
    File "<frozen importlib._bootstrap>", line 2237, in _find_and_load 
    File "<frozen importlib._bootstrap>", line 2226, in _find_and_load_unlocked 
    File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked 
    File "<frozen importlib._bootstrap>", line 1129, in _exec 
    File "<frozen importlib._bootstrap>", line 1471, in exec_module 
    File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed 
    File "/root/blrasp/django-mongoadmin/mysite/mysite/settings.py", line 137, in <module> 
    connect(MONGO_DATABASE_NAME, host=MONGO_HOST, port=MONGO_PORT) 
    File "/root/blrasp/myVirtEnv_1/lib/python3.4/site-packages/mongoengine/connection.py", line 164, in connect 
    return get_connection(alias) 
    File "/root/blrasp/myVirtEnv_1/lib/python3.4/site-packages/mongoengine/connection.py", line 126, in get_connection 
    raise ConnectionError("Cannot connect to database %s :\n%s" % (alias, e)) 
mongoengine.connection.ConnectionError: Cannot connect to database default : 
False is not a read preference. 

这里是我的settings.py文件：

(myVirtEnv_1) [root@sandbox1 django-mongoadmin]# cat mysite/mysite/settings.py 
""" 
Django settings for mysite project. 

Generated by 'django-admin startproject' using Django 1.10.5. 

For more information on this file, see 
https://docs.djangoproject.com/en/1.10/topics/settings/ 

For the full list of settings and their values, see 
https://docs.djangoproject.com/en/1.10/ref/settings/ 
""" 

import os 

# Build paths inside the project like this: os.path.join(BASE_DIR, ...) 
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__))) 


# Quick-start development settings - unsuitable for production 
# See https://docs.djangoproject.com/en/1.10/howto/deployment/checklist/ 

# SECURITY WARNING: keep the secret key used in production secret! 
SECRET_KEY = '(m!6up^g!2k=7xu5se_jnr9q7=1uyko6sjf%re)yh%tpx1(a8+' 

# SECURITY WARNING: don't run with debug turned on in production! 
DEBUG = True 

ALLOWED_HOSTS = [] 


# Application definition 

INSTALLED_APPS = [ 
    'django.contrib.admin', 
    'django.contrib.auth', 
    'django.contrib.contenttypes', 
    'django.contrib.sessions', 
    'django.contrib.messages', 
    'django.contrib.staticfiles', 
    'mongoadmin', 
    'mongoengine.django.mongo_auth', 
] 


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 = 'mysite.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 = 'mysite.wsgi.application' 


# Database 
# https://docs.djangoproject.com/en/1.10/ref/settings/#databases 

DATABASES = { 
    'default': { 
     'ENGINE': 'django.db.backends.dummy', 
    } 
} 


# Password validation 
# https://docs.djangoproject.com/en/1.10/ref/settings/#auth-password-validators 

AUTH_PASSWORD_VALIDATORS = [ 
    { 
     'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator', 
    }, 
    { 
     'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator', 
    }, 
    { 
     'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator', 
    }, 
    { 
     'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator', 
    }, 
] 


# Internationalization 
# https://docs.djangoproject.com/en/1.10/topics/i18n/ 

LANGUAGE_CODE = 'en-us' 

TIME_ZONE = 'UTC' 

USE_I18N = True 

USE_L10N = True 

USE_TZ = True 


# Static files (CSS, JavaScript, Images) 
# https://docs.djangoproject.com/en/1.10/howto/static-files/ 

STATIC_URL = '/static/' 

AUTHENTICATION_BACKENDS = ( 
      'mongoengine.django.auth.MongoEngineBackend', 
) 
AUTH_USER_MODEL = 'mongo_auth.MongoUser' 
MONGOENGINE_USER_DOCUMENT = 'mongoengine.django.auth.User' 

SESSION_ENGINE = 'mongoengine.django.sessions' 
SESSION_SERIALIZER = 'mongoengine.django.sessions.BSONSerializer' 

from mongoengine import connect 
MONGO_DATABASE_NAME = 'test' 
MONGO_HOST = '127.0.0.1' 
MONGO_PORT = 27017 
connect(MONGO_DATABASE_NAME, host=MONGO_HOST, port=MONGO_PORT) 

我已经alread检查以下内容：

• MongoDB是绝对正常运行

• 我检查MongoDB服务器是否是由“127.0.0.1”改变MONGO_HOST值“0.0.0.0访问”。同样的错误。

有人能告诉我为什么我得到这个错误吗？ 任何帮助是极大的赞赏

环境：

• OS：RHEL 7.3

• 的Python：3.4

• 的Django：1.10

• 的MongoDB：2.6.12

• PyMongo：3.4

• MongoEngine：0.11.0

Answer 1

你似乎有这里的问题列出：https://github.com/MongoEngine/mongoengine/issues/935 尝试降级Pymongo〜2.8。

也看这里：Django DB Connection with mangoDB using mangoengine gives me error?