Mongo aggregation builder
Simple aggregation pipeline builder for MongoDb. Inspired by the eloquent aheckmann/mquery.
var Maggregate = require'maggregate';require'mongodb'connecturiif err return handleErrorerr;// get a collectionvar collection = dbcollection'artists';// Create an instance of an aggregationvar aggregation = collection;// Build and executeaggregationmatch'works.medium': 'paint'unwind'$works'match'works.medium': 'paint'group_id: '$_id' paintingCount: $sum: 1 ;execcb;// Or with a callback...var aggregation = collection;aggregationmatch'works.medium': 'paint'unwind'$works'match'works.medium': 'paint'group_id: '$_id' paintingCount: $sum: 1 cb;
Maggregate also supports co
var aggregation = collection;var result = yield aggregationmatch'works.medium': 'paint'unwind'$works';
Currently, all mongo aggregation pipeline operators are supported. To learn how to use them, see the documentation for them.
All operations map to their same name, without the
$ prefix. All operations
are chainable, and can take a
callback for their last argument, making the call
Briefly, the operations are:
Maggregate provides a few methods to help use the built aggregation, in addition to the operators specified above.
change the collection on the aggregation. returns the chainable interface.
var writers = dbcollection'writers';aggregationcollectionwritersgroup;
Executes the aggregation. Takes a
callback in the form of
aggregationgroupexec//Do stuff with it.;
Wraps the db response using the given model. Simply passes the response into the given constructor. Returns the chainable interface.
var AnalyticsReport = require'./analytics-report-model.js'aggregationwrapAnalyticsReport;// ...// Bunch of queries to make a complex analytics report from the collection// ...aggregationexecreport instanceof AnalyticsReport === true // true;
(The MIT License)
Copyright (c) 2013 Ryan Schmukler
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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