>

{"nIndexesWas" : 1 , "msg" : "all indexes deleted for collection" , "ns" : > "businessinsider.test" , "ok" : 1}

>> db.test.save( { comments: [

{ name: 'blah', rate_up: 0, rate_down: 0, >> rate_ups: [], rate_downs: [] }

] } );
>> db.test.find();
> {"_id" : ObjectId( "4ac811c90516872d71363660") , "comments" : [

{"name" : > "blah" , "rate_up" : 0 , "rate_down" : 0 , "rate_ups" : [] , "rate_downs" : > []}

]}
>> db.test.update( {} , { $inc:

{ 'comments.0.rate_up': 1 }

, $push:

{ >> 'comments.0.rate_ups': 99 }

} );