Seneca data store plugin for MongoDB


This module is a plugin for the Seneca framework. It provides a storage engine that uses MongoDB to persist data. This module is for production use. It also provides an example of a document-oriented storage plugin code-base.

The Seneca framework provides an ActiveRecord-style data storage API. Each supported database has a plugin, such as this one, that provides the underlying Seneca plugin actions required for data persistence.

If you're using this module, feel free to contact me on twitter if you have any questions! :) @rjrodger

Current Version: 0.2.0

Tested on: Node 0.10.36, Seneca 0.6.1

var seneca = require('seneca')()
  var apple = seneca.make$('fruit')  = 'Pink Lady'
  apple.price = 0.99$(function(err,apple){
    console.log( " = "  )
npm install seneca
npm install seneca-mongo-store

You don't use this module directly. It provides an underlying data storage engine for the Seneca entity API:

var entity = seneca.make$('typename')
entity.someproperty = "something"
entity.anotherproperty = 100$( function(err,entity){ ... } )
entity.load$( {id: ...}, function(err,entity){ ... } )
entity.list$( {property: ...}, function(err,entity){ ... } )
entity.remove$( {id: ...}, function(err,entity){ ... } )

The standard Seneca query format is supported:

  • entity.list$({field1:value1, field2:value2, ...}) implies pseudo-query field1==value1 AND field2==value2, ...
  • you can only do AND queries. That's all folks. Ya'll can go home now. The Fat Lady has sung.
  • entity.list$({f1:v1,...},{sort$:{field1:1}}) means sort by field1, ascending
  • entity.list$({f1:v1,...},{sort$:{field1:-1}}) means sort by field1, descending
  • entity.list$({f1:v1,...},{limit$:10}) means only return 10 results
  • entity.list$({f1:v1,...},{skip$:5}) means skip the first 5
  • entity.list$({f1:v1,...},{fields$:['field1','field2']}) means only return the listed fields (avoids pulling lots of data out of the database)
  • you can use sort$, limit$, skip$ and fields$ together
  • entity.list$({f1:v1,...},{native$:[{-mongo-query-},{-mongo-options-}]}) allows you to specify a native mongo query, as per node-mongodb-native

As with all seneca stores, you can access the native driver, in this case, the node-mongodb-native collection object using entity.native$(function(err,collection){...}).

How to write this SQL query using Mongo aggregate in Seneca:

// SELECT cust_id, count(*) FROM orders GROUP BY cust_id HAVING count(*) > 1
var aggregateQuery = [{ $group: { _id: "$cust_id", count: { $sum: 1 } } }, { $match: { count: { $gt: 1 } } } ];
orders_ent.native$(function(err, db){
    var collection = db.collection('orders');
    collection.aggregate(aggregateQuery, function(err, list){
        if(err) return done(err);
        console.log("Found records:", list);
        // ...
    }); // end aggregate 
}); // end native$
cd test
mocha mongo.test.js --seneca.log.print