node.js - mongoose - divide and round -

hey question simple can't figure out: have huge mongoose collection player field money. how can divide value 100 , have round number (no decimal)

i tried

players.update({}, {$mul: {'money':.01}}, {multi: true}).exec() 

it works dividing 100 don't know how round it?

by way, why isn't there documentation $mul operator on official mongoose documentation ? http://mongoosejs.com/docs/3.0.x/docs/api.html

thanks folks

currently mongodb doesn't have in-built operators support math.ceil() or math.floor() functions. need on application server or write javascript function resides on database server , same.

implementing in application code:

players.find().foreach(function(doc){ var updated = math.ceil(doc.money/100); players.update({"_id":doc._id},{$set:{"money":updated}}); }) 

implementing server side javascript function:

db.system.js.insert({"_id":"updatemoney","value":function(num){     db.players.find().foreach(function(doc){     var updated = math.ceil(doc.money/num);     db.players.update({"_id":doc._id},{$set:{"money":updated}}); }) }}) 

and invoking function mongoose:

mongoose.connection.on("open", function(err){   mongoose.connection.db.eval("updatemoney(100)", function (err, retval) {       console.log('err: '+err);       console.log('retval: '+retval);   }); }); 

$mul mongodb operator, mongoose api enables use these operators query mongodb.