how to do a dbstats with MongoEngine

mongoengine - get db attribute

Credits to @wojcikstefan in this thread: https://github.com/MongoEngine/mongoengine/issues/1056

In [14]: from mongoengine.connection import get_db, connect

In [15]: connect('testdb')
Out[15]: MongoClient(host=['localhost:27017'], document_class=dict, tz_aware=False, connect=True, read_preference=Primary())

In [16]: db = get_db()

In [17]: db.command('dbstats')
Out[17]:
{u'avgObjSize': 905.9408695652174,
 u'collections': 29,
 u'dataFileVersion': {u'major': 4, u'minor': 22},
 u'dataSize': 1041832.0,
 u'db': u'testdb',
 u'extentFreeList': {u'num': 9, u'totalSize': 33509376},
 u'fileSize': 67108864.0,
 u'indexSize': 277984.0,
 u'indexes': 34,
 u'nsSizeMB': 16,
 u'numExtents': 31,
 u'objects': 1150,
 u'ok': 1.0,
 u'storageSize': 1327104.0}