I have view map and reduce like this: Map:     function(doc) {            if(doc.type){             var usersLength = doc.users.length;             for (var i = 0; i < usersLength ; i++) {                     emit([doc.users[i].userid,doc.Service....

So I have Riak running on 2 EC2 servers, using python to run javascript Mapreduce. They have been clustered. Mainly used for "proof of concept".   There are 50 keys in the bucket, all the map/reduce function does is re-format the data. This i...

I want to reduce this object to just an object containing product name and average price. What's the fastest way to do it?  var foo = { group1: [         {             name: "one",             price: 100         },         {             n...

I'm trying to do a simple map reduce in the Mongo shell, but the reduce function never gets called. This is my code :  db.sellers.mapReduce(      function(){ emit( this._id, 'Map') } ,      function(k,vs){ return 'Reduce' },...

I'm using what seems to be a common trick for creating a join view:  // a Customer has many Orders; show them together in one view: function(doc) {   if (doc.Type == "customer") {     emit([doc._id, 0], doc);   } else if (doc.Type == "...

I have a query where I need to return 10 of "Type A" records, while returning all other records. How can I accomplish this?  Update: Admittedly, I could do this with two queries, but I wanted to avoid that, if possible, thinking it would be l...

Lets say I have two types of documents stored in my CouchDB database. First is with property type set to contact and second to phone. Contact type document have another property called name. Phone type have properties number and contact_id so that it...

I'm trying to use reduce to return an array like so:  var myArray = [1,2,3]; _.reduce(myArray, function (seed, item) { return seed.push(item);}, []);   I expect that it will produce an array just like myArray. Instead for the first item, seed is...

I have a M/R function, and I get NaN as a value for some of the results. I dont have any experience with JS. Im escaping JS using Java Drivers.  String map = "function(){" + " emit({"             + "country: this.info.location.cou...

Disclaimer: I am reviewing CouchDB for a new project, so I am not too familiar with its inner workings yet.  How can I introduce a Javascript Library into CouchDB so that I can use it in my MapReduce views?...