MapReduce is fixed and working as described below.
Very simple implementation of some of mongodb aggregation framework functions for Meteor. Extends Collection on both Server and Client with 3 methods so far so that you can do:
col = new Meteor.Collection "name"
if Meteor.isClient
col.distinct "Field Name", (error, result)->
console.dir result
col.aggregate pipeline, (error, result)->
console.dir result
# just an example - map and reduce need to be defined as strings
map = "function() {emit(this.Region, this.Amount);}"
reduce = "function(reg, am) { return Array.sum(am);};"
col.mapReduce map, reduce, {out: "out_collection_name", verbose: true}, (err,res)->
console.dir res.stats # statistics object for running mapReduce
col = new Meteor.Collection res.collectionName
Meteor.subscribe res.collectionName, ->
data = col.find().fetch() # resulting collection
console.dir data
if Meteor.isServer
result = col.distinct "Field Name"
console.dir result
result = col.aggregate pipeline
console.dir resultIf called on the client, it simply passes the call to the server collection - so that's mostly a convenience wrapper. No visibility permissions are checked, so be careful with what data you may want to expose.
mapReduce call is slightly more advanced: as results of running mapReduce are put into a separate collection, it is automatically published on the server so you can subscribe on the client, (theoretically) providing reactivity for subsequent calls.
This package is MIT Licensed. Do whatever you like with it but any responsibility for doing so is your own.