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Loksly
/ join_using_map_reduce.js
Created
November 4, 2016 18:46
Join using two map reduces for stackoverflow ( https://github.com/dsevilla/bdge/blob/master/mongo/sesion4.ipynb )
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| db.comments.mapReduce( | |
| function(){ | |
| emit(this.PostId, { Comments: [ this ]}) | |
| }, | |
| function(key, val){ | |
| var first = val.shift(); | |
| var comments = val.reduce(function(valorAnterior, valorActual){ | |
| return Array.prototype.concat.apply( valorAnterior, valorActual.Comments); | |
| }, first.Comments ); |
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| /* | |
| T-Rex J. | |
| T-Rex for waiting rooms and so. | |
| see how it works: https://youtu.be/-D2s_9RCOrw | |
| go this url: chrome://network-error/-106 | |
| press ctrl + shift + j |