server/initializers/migrator.js

   1 'use strict'
   2
   3 const eachSeries = require('async/eachSeries')
   4 const mongoose = require('mongoose')
   5 const path = require('path')
   6
   7 const constants = require('./constants')
   8 const logger = require('../helpers/logger')
   9
  10 const Application = mongoose.model('Application')
  11
  12 const migrator = {
  13   migrate: migrate
  14 }
  15
  16 function migrate (callback) {
  17   Application.loadMongoSchemaVersion(function (err, actualVersion) {
  18     if (err) return callback(err)
  19
  20     // If there are a new mongo schemas
  21     if (!actualVersion || actualVersion < constants.LAST_MONGO_SCHEMA_VERSION) {
  22       logger.info('Begin migrations.')
  23
  24       eachSeries(constants.MONGO_MIGRATION_SCRIPTS, function (entity, callbackEach) {
  25         const versionScript = entity.version
  26
  27         // Do not execute old migration scripts
  28         if (versionScript <= actualVersion) return callbackEach(null)
  29
  30         // Load the migration module and run it
  31         const migrationScriptName = entity.script
  32         logger.info('Executing %s migration script.', migrationScriptName)
  33
  34         const migrationScript = require(path.join(__dirname, 'migrations', migrationScriptName))
  35         migrationScript.up(function (err) {
  36           if (err) return callbackEach(err)
  37
  38           // Update the new mongo version schema
  39           Application.updateMongoSchemaVersion(versionScript, callbackEach)
  40         })
  41       }, function (err) {
  42         if (err) return callback(err)
  43
  44         logger.info('Migrations finished. New mongo version schema: %s', constants.LAST_MONGO_SCHEMA_VERSION)
  45         return callback(null)
  46       })
  47     } else {
  48       return callback(null)
  49     }
  50   })
  51 }
  52
  53 // ---------------------------------------------------------------------------
  54
  55 module.exports = migrator
  56