application.rb

    config.middleware.insert_after Warden::Manager, Dragonfly::Middleware, :reports
    config.middleware.insert_after Rack::Cache, Dragonfly::Middleware, :images

dragonfly.rb

# File uploads
file_app = Dragonfly[:reports]
file_app.configure_with(:rails)
file_app.define_macro(ActiveRecord::Base, :file_accessor)

file_app.configure do |config|

  config.server.before_serve do |job, env|
    Rails.logger.info "************** in file before_serve"

    unless env['warden'] && env['warden'].user && env['warden'].user.has_admin_role?
      # Prevent direct access to file urls
      throw :halt, [404, { 'Content-type' => 'text/plain' }, ['The content you are trying to access does not exist']]
    end
  end
end

# require 'dragonfly/rails/images'
# Regular image uploads
image_app = Dragonfly[:images]
image_app.configure_with(:rails)
image_app.configure_with(:imagemagick)
image_app.define_macro(ActiveRecord::Base, :image_accessor)

image_app.configure do |config|

  config.server.before_serve do |job, env|
    Rails.logger.info "************** in image before_serve"
  end
end