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SomeSchema.methods.mapReduce = function(callback) { | |
function map() { | |
/*global emit:true */ | |
emit('something', {foos:this.foos, users:1}); | |
} | |
function reduce(k, av) { | |
var foos = 0; | |
av.forEach(function(v) { | |
foos += v.foos; | |
}); | |
return {foos:foos, users:av.length}; | |
} | |
function finalize(k, v) { | |
v.average = Math.floor(v.foos / v.users); | |
return v; | |
} | |
var command = { | |
mapreduce : 'collection_name' | |
, query: {bar:{$gt: 9}} // we iterate over docs in collection_name with bar>9 | |
, out: { inline: 1 } | |
, map: map.toString() | |
, reduce: reduce.toString() | |
, finalize: finalize.toString() | |
}; | |
mongoose.connection.db.executeDbCommand(command, function(err, dbres) { | |
var out = {foos:0, users:0, average:0}; // this is my default output | |
try { out = dbres.documents[0].results[0].value; } catch(e) {} | |
callback(err, out); | |
}); | |
}; |
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Personal Note:
Learn the try and catch method here...