Mongoid + carrierwave backgrounder + sidekiq

admin_image.rb

class Admin::Image
  include Mongoid::Document
  include Mongoid::Timestamps

  ## Carrierwave ##
  mount_uploader :file, AdminImageUploader
  process_in_background :file

  ## Fields ##
  field :file, type: String
  field :file_processing, type: Boolean
  field :illustrable, type: Boolean, default: nil

  ## Validations ##
  validates :file, presence: true
end

admin_images_controller.rb

class Admin::ImagesController < AdminController
  before_filter :load_resource
  respond_to :js, :html, :json

  def create
    resource_param = @resource.to_s.underscore.split("/").join("_")
    @image = @resource.new(params[resource_param.to_sym])
    @image.process_file_upload = true
    if @image.save
      respond_with(@image)
    else

    end
  end

private

  def load_resource
    allowed = {"images" => Admin::Image, "screenshots" => Ga::GameShot}
    if params[:what] && allowed.has_key?(params[:what])
      @resource = allowed[params[:what]]
    else
      # Error
    end
  end

end

admin_images_uploader.rb

# encoding: utf-8

class AdminImageUploader < CarrierWave::Uploader::Base
  include CarrierWave::Backgrounder::Delay
  include CarrierWave::RMagick

  storage :file
  
  def store_dir
    if Rails.env == "test"
      "specs/uploads/redaction/images/#{model.id}"
    else
      "uploads/redaction/images/#{model.id}"
    end
  end

  version :thumbnail do
    process :resize_to_fill => [70, 50]
  end

  version :content_thumb do
    process :resize_to_fill => [140, 80]
  end


  version :actu, if: :is_illustrable? do

    version :big_slider do
      process :resize_to_fill => [651, 334]
    end

    version :tophome do 
      process :resize_to_fill => [250, 150]
    end

    version :big_banderolle do
      process :resize_to_fill => [610, 200]
    end

    version :banderolle do
      process :resize_to_fill => [300, 100]
    end

  end

  def extension_white_list
    %w(jpg jpeg gif png)
  end

private

  def is_illustrable?(file)
    return model.illustrable unless model.illustrable.nil?
  end

end

carrierwave_initializer.rb

CarrierWave.configure do |config|
  config.cache_dir = "#{Rails.root}/tmp/uploads"

  if Rails.env == "test"
    config.storage = :file
    # config.enable_processing = false
  else
    config.storage = :fog
    config.fog_credentials = {
      :provider               => 'AWS',
      :aws_access_key_id      => '***',
      :aws_secret_access_key  => '***',
      :region                 => 'eu-west-1'
    }
    config.fog_directory  = 'static.playdoria.net'
    config.fog_host       = 'http://static.playdoria.net'
    # config.fog_host = proc do |file|
    #   identifier = (rand(100)%4)
    #   "http://static#{identifier}.playdoria.net"
    # end
    config.fog_public     = true
  end
end

I have exaclty the same setup and unfortunately the same bug. My sidekiq doesnt get called.

I've also tried to use the after_create callback to enque to sidekiq. But this doesn't help since the file isn't uploaded when processing the file.

Another idea is to use the carrierwave uploader callbacks (https://github.com/jnicklas/carrierwave/wiki/How-to%3A-use-callbacks)

But in this case you are in the uploader. So self is not your model. You may find a way how to get to a reference to this?

I've already openend an issue for this (carrierwaveuploader/carrierwave#856). If you find a way please post it there :)

I let you know if I find a way to solve this. Please let me know if you do ;)