Simple Map/Reduce MongoVUE

Question

I am trying to get a simple map reduce working in MongoVUE, but it doesn't return any results, I just want to get it to output the count of each userID just so I can have a working example to build from.

function Map() {
emit( this.UpdatedBy.UserId, {"count": 1} );
}

function Reduce(key, values) {

var result = {count: 0};
  values.forEach(function(value) {
  result.count += value.count;
});
return result;
}

function Finalize(key, reduced) {
/*  
reduced = Transform-to-Desired-Form(reduced);
*/
return reduced;
}

And the output is set to inline.

This is the tutorial I am working from, but I just want to apply a simple count to start off with http://www.mongovue.com/2010/11/03/yet-another-mongodb-map-reduce-tutorial/

did you check this on mongodb shell? – RameshVel Feb 15 '12 at 06:15 — RameshVel, Feb 15 '12 at 06:15
I'd like to know why MongoVUE doesn't report any errors. – nilskp Oct 17 '12 at 17:18 — nilskp, Oct 17 '12 at 17:18

score 3 · Accepted Answer · answered Feb 15 '12 at 23:24

function() {
    emit( this.UpdatedBy.UserId, 1 );
  };


  function(key, values) {
    var result =  0;

    values.forEach(function(value) {
      result += value;
    });
    return result;
  };

Here is how I got it to work for anyone who needs a simple example on how to group and count a user Id.

score 0 · Answer 2 · answered May 24 '12 at 19:01

0

I just wrote a blog post and made two short screencasts showing exactly how to get an example MapReduce working in MongoVue

answered May 24 '12 at 19:01

Lynn Langit

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Simple Map/Reduce MongoVUE

2 Answers2