add delayed_job dependency

Gemfile

@@ -19,6 +19,7 @@ gem 'lodash-rails'
 gem 'yajl-ruby', require: 'yajl'
 gem 'multi_json'
 gem 'carrierwave', '~> 0.11.0'
+gem 'delayed_job_active_record', '~> 4.1.0'
 
 group :test, :development do
   gem 'rspec-rails'

Gemfile.lock

@@ -85,6 +85,11 @@ GEM
       tins (~> 1.6.0)
     database_cleaner (1.5.2)
     debug_inspector (0.0.2)
+    delayed_job (4.1.1)
+      activesupport (>= 3.0, < 5.0)
+    delayed_job_active_record (4.1.0)
+      activerecord (>= 3.0, < 5)
+      delayed_job (>= 3.0, < 5)
     diff-lcs (1.2.5)
     docile (1.1.5)
     erubis (2.7.0)
@@ -246,6 +251,7 @@ DEPENDENCIES
   coffee-rails (~> 4.0.0)
   coveralls
   database_cleaner
+  delayed_job_active_record (~> 4.1.0)
   fabrication
   haml
   jbuilder (~> 1.2)

bin/delayed_job

@@ -0,0 +1,5 @@
+#!/usr/bin/env ruby
+
+require File.expand_path(File.join(File.dirname(__FILE__), '..', 'config', 'environment'))
+require 'delayed/command'
+Delayed::Command.new(ARGV).daemonize

config/application.rb

@@ -24,6 +24,7 @@ class Application < Rails::Application
     # config.time_zone = 'Central Time (US & Canada)'
 
     config.active_record.raise_in_transactional_callbacks = true
+    config.active_job.queue_adapter = :delayed_job
 
     # The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
     # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]

db/migrate/20160427171018_create_delayed_jobs.rb

@@ -0,0 +1,22 @@
+class CreateDelayedJobs < ActiveRecord::Migration
+  def self.up
+    create_table :delayed_jobs, force: true do |table|
+      table.integer :priority, default: 0, null: false # Allows some jobs to jump to the front of the queue
+      table.integer :attempts, default: 0, null: false # Provides for retries, but still fail eventually.
+      table.text :handler,                 null: false # YAML-encoded string of the object that will do work
+      table.text :last_error                           # reason for last failure (See Note below)
+      table.datetime :run_at                           # When to run. Could be Time.zone.now for immediately, or sometime in the future.
+      table.datetime :locked_at                        # Set when a client is working on this object
+      table.datetime :failed_at                        # Set when all retries have failed (actually, by default, the record is deleted instead)
+      table.string :locked_by                          # Who is working on this object (if locked)
+      table.string :queue                              # The name of the queue this job is in
+      table.timestamps null: true
+    end
+
+    add_index :delayed_jobs, [:priority, :run_at], name: "delayed_jobs_priority"
+  end
+
+  def self.down
+    drop_table :delayed_jobs
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160427160413) do
+ActiveRecord::Schema.define(version: 20160427171018) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -42,6 +42,22 @@
     t.integer "version", default: 0
   end
 
+  create_table "delayed_jobs", force: :cascade do |t|
+    t.integer  "priority",   default: 0, null: false
+    t.integer  "attempts",   default: 0, null: false
+    t.text     "handler",                null: false
+    t.text     "last_error"
+    t.datetime "run_at"
+    t.datetime "locked_at"
+    t.datetime "failed_at"
+    t.string   "locked_by"
+    t.string   "queue"
+    t.datetime "created_at"
+    t.datetime "updated_at"
+  end
+
+  add_index "delayed_jobs", ["priority", "run_at"], name: "delayed_jobs_priority", using: :btree
+
   create_table "disease_source_variants", force: :cascade do |t|
     t.integer "disease_id"
     t.integer "source_id"