django-mongodb引擎保存了哪些集合数据？

I am using django-mongodb engine to connect django with mongodb. I have a model in my application named as bandwidth. when i save data through python manage.py shell , it saves data in a collection named as app_bandwidth. How does this engine saves this data?? Also can I modify the collection name to be per_app_bandwidth.I am using django-mongodb engine to connect dja