render_without_request

class SalesReportWorker < ApplicationController
  include Sidekiq::Worker
  sidekiq_options backtrace: true, retry: false

  self.view_paths = "app/views"                     # Where to look for view templates
  
  def perform(request_ident, params)
    @_response = ActionDispatch::Response.new       # Needed to avoid "ActionController::RackDelegation#content_type 
                                                    # delegated to @_response.content_type, but @_response is nil" error
    ...
      
    html = render template: 'sales_reports/show.js.erb'

    ...
  end
  ...
end

This gist shows how to use the Rails rendering engine within a Sidekiq worker.

Hello, Jack. Did you try this approach on Rails 4.1? I'm trying to do this, but I'm getting the following error:

Failure/Error: subject.export
     ActionView::Template::Error:
       undefined method 'host' for nil:NilClass

Do you have any idea? Rails expect to find a request object that responds to host method. The backtrace: actionpack-4.1.9/lib/action_controller/metal/url_for.rb:27:inurl_options'`

Thanks.