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...

There is a question (and answer) that deals with the general case. I am having difficulty using a scope variable as a field key (as opposed to the field value)  In the example below all the FULLY_CAPS fields are scope variables. In the case of SERVIC...

I take data from a search box and then insert into MongoDB as a document using the regular insert query. The data is stored in a collection for the word "cancer" in the following format with unique "_id".  {   "_id": {     ...

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 stuck on the following:  A script is returning an arbitrary number n or array, like this:  [["a"], ["b"], ["c"], ["d"]]   I need to loop over the arrays using promise then(), but as I don't know how many el...

I have multiple documents with this schema, each document is per product per day:  {     _id:{},     app_id:'DHJFK67JDSJjdasj909',     date:'2014-08-07',     event_count:32423,     event_count_per_type: {         0:322,         10:423...

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...