how to setup for rails

after adding and installing pdfkit in your rails app

you need to add pdfkit middleware in your rails application

application.rb

  class Application < Rails::Application
    # Initialize configuration defaults for originally generated Rails version.
    config.load_defaults 6.1

    # Configuration for the application, engines, and railties goes here.
    #
    # These settings can be overridden in specific environments using the files
    # in config/environments, which are processed later.
    #
    # config.time_zone = "Central Time (US & Canada)"
    # config.eager_load_paths << Rails.root.join("extras")
    config.middleware.use PDFKit::Middleware
  end

then add pdf in your mime type mime_types.rb

Mime::Type.register "application/pdf", :pdf

restart your application then you could generate the pdf from your pages by adding .pdf at the end of url or set the link_to format with :pdf