Mongoengine: ConnectionError: You have not defined a default connection

Issue

In my new Django project I set up a MongoDB database and use mongoengine module
but I can’t properly access the dabase neither in shell nor in views.

"ConnectionError: You have not defined a default connection"

My settings.py includes the following:

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'DaTaBaSe',                      
        'USER': 'root',
        'PASSWORD': '',
        'HOST': 'localhost', 
        'PORT': '3306',                  
    },
    'tracking': {
        'ENGINE': 'django.db.backends.dummy',
        'NAME': 'analytics',
    }
}



import mongoengine
SESSION_ENGINE = 'mongoengine.django.sessions'
mongoengine.connect(_MONGODB_NAME, 'localhost:27017')
AUTHENTICATION_BACKENDS = (
       'mongoengine.django.auth.MongoEngineBackend',
        )

In models.py:

import mongoengine

from mongoengine import *
from myproject.settings import _MONGODB_NAME
mongoengine.connect(_MONGODB_NAME, 'localhost:27017')

Solution

To use django with MongoDB do not use the django package available on https://www.djangoproject.com and install other packages like mongoengine, if follow this process you will find lot of difficulties.

Rather you need to use the [email protected] version of django that has been forked from djangoproject and added MongoDB support and I am sure it will make setup process and development process lot easier.

Follow this link to install and set up the django with MongoDB.
http://django-mongodb-engine.readthedocs.org/en/latest/topics/setup.html

One more thing you may find the error below, while setting up django.

“*Error on Django-nonrel and MongoDB: AutoField (default primary key) values must be strings representing an ObjectId on MongoDB (got u’1′ instead). Please make sure your SITE_ID contains a valid ObjectId string.*”

Follow this link to fix.

https://gist.github.com/ielshareef/2986459

Please let me know if you need any more help on this.

Answered By – Shanki

This Answer collected from stackoverflow, is licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0

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