Offline Template Renderer for Rails Rake Tasks or Background Worker

#ruby

#rails

#rake

#offline

#render

#background-worker

Trying to render a .pdf offline, in a rake task, without success? Host nil? Request nil?

Try using this trick...

offline_template.rb

class OfflineTemplate < AbstractController::Base
 include AbstractController::Logger
 include AbstractController::Rendering
 include AbstractController::Layouts
 include AbstractController::Helpers
 include AbstractController::Translation
 include AbstractController::AssetPaths
 include ActionDispatch::Routing::UrlFor
 include Rails.application.routes.url_helpers
 Rails.application.routes.default_url_options = { :host => 'www.yoursite.com' }

 helper ApplicationHelper

 helper_method :protect_against_forgery?

 # configure the different paths correctly
 def initialize(*args)
 super()
 lookup_context.view_paths = Rails.root.join('app', 'views')
 config.javascripts_dir = Rails.root.join('public', 'javascripts')
 config.stylesheets_dir = Rails.root.join('public', 'stylesheets')
 config.assets_dir = Rails.root.join('public')
 end

 # we are not in a browser, no need for this
 def protect_against_forgery?
 false
 end

 # so that your flash calls still work
 def flash
 {}
 end

 def params
 {}
 end

 # same asset host as the controllers
 self.asset_host = ActionController::Base.asset_host
end

Usage

template = OfflineTemplate.new
pdf_page = template.render_to_string partial: 'partial', layout: "pdf", formats: :html, locals: {:@user => user}

kit = PDFKit.new(pdf_page)
kit.stylesheets << "#{Rails.root}/app/assets/stylesheets/pdf/pdf.css"

pdf = open(kit.to_file(temp_dir + user.id.to_s + '_tmp.pdf'))