How do I configure ActiveJob to use Resque?

Question

I am having a bit of difficulty with ActiveJob in Rails 4.2 and Resque.

I've installed redis and I've added resque and resque-scheduler to my Gemfile.

I've created a test job - it is just the generated file

rails g job test

but I keep getting errors about ActiveJob not defined

NameError: uninitialized constant ActiveJob

or missing method when I switch the adapter like this

config.active_job.queue_adapter = :resque

I get this error

/usr/local/lib/ruby/gems/2.1.0/gems/railties-4.2.0.beta1/lib/rails/railtie/configuration.rb:95:in `method_missing': undefined method `active_job' for #<Rails::Application::Configuration:0x007f97ba98a5b8> (NoMethodError)

I've even looked at the source code but I have no idea. It is just calling super.

https://github.com/rails/rails/blob/master/railties/lib/rails/railtie/configuration.rb#L95

What I am missing? Why doesn't the queue adapter work? Does anyone know how to fix this?

Answer 1

I turns out that I had selected which frameworks I was using.

# config/application.rb 
require "active_model/railtie"
require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "action_view/railtie"
require "sprockets/railtie"

The way to fix it, is to add the Active Job framework in the application.rb file.

require "active_job/railtie"

Or to load all of Rails

require 'rails/all'

This seems to be working now.