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NodeJs+MongoDB+Migrations
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| /* | |
| This script uses https://github.com/tj/node-migrate module for NodeJs | |
| Installing: | |
| 1. npm install -g grunt-cli | |
| 2. npm install grunt --save-dev | |
| 3. npm install migrate -g | |
| Running from console: | |
| 1. migrate create migration_script | |
| 2. migrate up migration_script.js | |
| */ | |
| 'use strict' | |
| var MongoClient = require('mongodb').MongoClient, | |
| url = 'mongodb://localhost:27017/restaurant'; | |
| exports.up = function (next) { | |
| MongoClient.connect(url, function (err, db) { | |
| var collection = db.collection('product_categories'), | |
| Q = require('q'); | |
| // grouping query | |
| collection.aggregate([ | |
| { | |
| $sort: { | |
| createdAt: 1 | |
| } | |
| }, | |
| { | |
| $group: { | |
| _id: "$restaurant", | |
| ids: {$push: "$_id"} | |
| } | |
| } | |
| ], function (err, restaurants) { | |
| // response | |
| if(err) { | |
| console.error(err); | |
| } else { | |
| var ObjectID = require('mongodb').ObjectID, | |
| promises = []; | |
| for(var i in restaurants) { | |
| for(var k in restaurants[i].ids) { | |
| promises.push((function() { | |
| var deferred = Q.defer(); | |
| // add sortorder | |
| collection.updateOne({_id: new ObjectID(restaurants[i].ids[k]) }, {$set:{sortorder: parseInt(k)}}).then(function(result){ | |
| deferred.resolve(true); | |
| }); | |
| return deferred.promise; | |
| })()); | |
| } | |
| } | |
| Q | |
| .allSettled(promises) | |
| .then(function(data) { | |
| // creating index | |
| collection.createIndex({restaurant:1, sortorder:1} | |
| , {unique:true}, function(err, indexName) { | |
| if(err) console.error(err); | |
| else { | |
| next(); | |
| } | |
| db.close(); | |
| }); | |
| }).catch(function(error) { | |
| console.error(error.message); | |
| }); | |
| } | |
| }); | |
| }); | |
| }; | |
| exports.down = function (next) { | |
| MongoClient.connect(url, function (err, db) { | |
| var collection = db.collection('product_categories'); | |
| // drop index | |
| collection.dropIndex("restaurant_1_sortorder_1", function(err, result) { | |
| // drop all sortorder | |
| var o = {w:1}; | |
| o.multi = true; | |
| collection.updateMany({}, {$unset:{sortorder:""}}, o, function(err, r) { | |
| db.close(); | |
| next(); | |
| }); | |
| }); | |
| }); | |
| }; |
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