如何配置我的rails引擎以与shopify_app一起使用？

Question

我正在尝试在rails引擎中使用shopify_app gem。首先，发电机似乎不支持发动机。它们与rails应用程序完美配合。所以，我用了

rails generate shopify_app --api_key [APIKEY_HERE] --secret [SECRET_HERE] --embedded false --scope read_content,read_products,read_customers,read_orders

在新的rails应用程序上并将更改复制到我的rails引擎中。我改变了名为Shopify的引擎如下; （一行后面的注释中的++表示添加了行，文件名中的++表示在初始生成引擎命令后添加了整个文件）

#app/controllers/shopify/application_controller.rb
module Shopify
  class ApplicationController < ActionController::Base
    include ShopifyApp::LoginProtection #++
    protect_from_forgery with: :exception
  end
end

#app/controllers/shopify/home_controller.rb # ++
module Shopify
  class HomeController < ShopifyApp::AuthenticatedController
    def index
      @products = ShopifyAPI::Product.find(:all, :params => {:limit => 10})
    end
  end
end

# config/routes.rb
Shopify::Engine.routes.draw do
  root :to => 'home#index' # ++
  mount ShopifyApp::Engine, at: '/' # ++
end

# app/models/shop.rb (Using mongoid) # ++
module Shopify
  class Shop
    include Mongoid::Document
    include ShopifyApp::Shop
    include ShopifyApp::SessionStorage
  end
end

# config/initializers/omniauth.rb # ++
Rails.application.config.middleware.use OmniAuth::Builder do
  provider :shopify,
    ShopifyApp.configuration.api_key,
    ShopifyApp.configuration.secret,
    scope: ShopifyApp.configuration.scope
end

# config/initializers/shopify_app.rb # ++
ShopifyApp.configure do |config|
  config.api_key = "KEY_HERE"
  config.secret = "SECRET_HERE"
  config.scope = "read_content,read_products,read_customers,read_orders"
  config.embedded_app = false
end

# config/initializers/shopify_session_repository.rb # ++
if Rails.configuration.cache_classes
  ShopifyApp::SessionRepository.storage = Shopify::Shop
else
  ActionDispatch::Reloader.to_prepare do
    ShopifyApp::SessionRepository.storage = Shopify::Shop
  end
end

# lib/shopify.rb (Not related to shopify_app, just a project file that loads shopify_app)
require "shopify/engine"
require "mongoid"
require "shopify_app" # ++

module Shopify
  Mongoid.load!(Shopify::Engine.root.join("config", "mongoid.yml"))
end


<!--app/views/shopify/home/index.html.erb--> <!-- ++ -->
<h2>Products</h2>

<ul>
  <% @products.each do |product| %>
    <li><%= link_to product.title, "https://#{@shop_session.url}/admin/products/#{product.id}", target: "_top" %></li>
  <% end %>
</ul>

我使用此命令创建新引擎rails plugin new shopify --mountable

当我尝试打开http://localhost:3000/shopify/时，我收到此错误：

NoMethodError (undefined method `login_again_if_different_shop' for #<Shopify::HomeController:0x007f8163d53540>): activesupport (4.2.8) lib/active_support/callbacks.rb:432:in `block in make_lambda' activesupport (4.2.8) lib/active_support/callbacks.rb:164:in `block in halting' activesupport (4.2.8) lib/active_support/callbacks.rb:504:in `block in call' activesupport (4.2.8) lib/active_support/callbacks.rb:504:in `each' activesupport (4.2.8) lib/active_support/callbacks.rb:504:in `call' activesupport (4.2.8) lib/active_support/callbacks.rb:92:in `__run_callbacks__' activesupport (4.2.8) lib/active_support/callbacks.rb:778:in `_run_process_action_callbacks' activesupport (4.2.8) lib/active_support/callbacks.rb:81:in `run_callbacks' actionpack (4.2.8) lib/abstract_controller/callbacks.rb:19:in `process_action' actionpack (4.2.8) lib/action_controller/metal/rescue.rb:29:in `process_action' actionpack (4.2.8) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action' activesupport (4.2.8) lib/active_support/notifications.rb:164:in `block in instrument' activesupport (4.2.8) lib/active_support/notifications/instrumenter.rb:20:in `instrument' activesupport (4.2.8) lib/active_support/notifications.rb:164:in `instrument' actionpack (4.2.8) lib/action_controller/metal/instrumentation.rb:30:in `process_action' actionpack (4.2.8) lib/action_controller/metal/params_wrapper.rb:250:in `process_action' actionpack (4.2.8) lib/abstract_controller/base.rb:137:in `process' actionview (4.2.8) lib/action_view/rendering.rb:30:in `process' actionpack (4.2.8) lib/action_controller/metal.rb:196:in `dispatch' actionpack (4.2.8) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch' actionpack (4.2.8) lib/action_controller/metal.rb:237:in `block in action' actionpack (4.2.8) lib/action_dispatch/routing/route_set.rb:74:in `dispatch' actionpack (4.2.8) lib/action_dispatch/routing/route_set.rb:43:in `serve' actionpack (4.2.8) lib/action_dispatch/journey/router.rb:43:in `block in serve' actionpack (4.2.8) lib/action_dispatch/journey/router.rb:30:in `each' actionpack (4.2.8) lib/action_dispatch/journey/router.rb:30:in `serve' actionpack (4.2.8) lib/action_dispatch/routing/route_set.rb:817:in `call' railties (4.2.8) lib/rails/engine.rb:518:in `call' railties (4.2.8) lib/rails/railtie.rb:194:in `public_send' railties (4.2.8) lib/rails/railtie.rb:194:in `method_missing' actionpack (4.2.8) lib/action_dispatch/routing/mapper.rb:51:in `serve' actionpack (4.2.8) lib/action_dispatch/journey/router.rb:43:in `block in serve' actionpack (4.2.8) lib/action_dispatch/journey/router.rb:30:in `each' actionpack (4.2.8) lib/action_dispatch/journey/router.rb:30:in `serve' actionpack (4.2.8) lib/action_dispatch/routing/route_set.rb:817:in `call' omniauth (1.6.1) lib/omniauth/strategy.rb:189:in `call!' omniauth (1.6.1) lib/omniauth/strategy.rb:167:in `call' omniauth (1.6.1) lib/omniauth/builder.rb:63:in `call' exception_notification (4.2.1) lib/exception_notification/rack.rb:32:in `call' rack (1.6.8) lib/rack/etag.rb:24:in `call' rack (1.6.8) lib/rack/conditionalget.rb:25:in `call' rack (1.6.8) lib/rack/head.rb:13:in `call' actionpack (4.2.8) lib/action_dispatch/middleware/params_parser.rb:27:in `call' actionpack (4.2.8) lib/action_dispatch/middleware/flash.rb:260:in `call' rack (1.6.8) lib/rack/session/abstract/id.rb:225:in `context' rack (1.6.8) lib/rack/session/abstract/id.rb:220:in `call' actionpack (4.2.8) lib/action_dispatch/middleware/cookies.rb:560:in `call' actionpack (4.2.8) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' activesupport (4.2.8) lib/active_support/callbacks.rb:88:in `__run_callbacks__' activesupport (4.2.8) lib/active_support/callbacks.rb:778:in `_run_call_callbacks' activesupport (4.2.8) lib/active_support/callbacks.rb:81:in `run_callbacks' actionpack (4.2.8) lib/action_dispatch/middleware/callbacks.rb:27:in `call' actionpack (4.2.8) lib/action_dispatch/middleware/reloader.rb:73:in `call' actionpack (4.2.8) lib/action_dispatch/middleware/remote_ip.rb:78:in `call' actionpack (4.2.8) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call' actionpack (4.2.8) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' railties (4.2.8) lib/rails/rack/logger.rb:38:in `call_app' railties (4.2.8) lib/rails/rack/logger.rb:20:in `block in call' activesupport (4.2.8) lib/active_support/tagged_logging.rb:68:in `block in tagged' activesupport (4.2.8) lib/active_support/tagged_logging.rb:26:in `tagged' activesupport (4.2.8) lib/active_support/tagged_logging.rb:68:in `tagged' railties (4.2.8) lib/rails/rack/logger.rb:20:in `call' actionpack (4.2.8) lib/action_dispatch/middleware/request_id.rb:21:in `call' rack (1.6.8) lib/rack/methodoverride.rb:22:in `call' rack (1.6.8) lib/rack/runtime.rb:18:in `call' activesupport (4.2.8) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call' rack (1.6.8) lib/rack/lock.rb:17:in `call' actionpack (4.2.8) lib/action_dispatch/middleware/static.rb:120:in `call' rack (1.6.8) lib/rack/sendfile.rb:113:in `call' railties (4.2.8) lib/rails/engine.rb:518:in `call' railties (4.2.8) lib/rails/application.rb:165:in `call' rack (1.6.8) lib/rack/lock.rb:17:in `call' rack (1.6.8) lib/rack/content_length.rb:15:in `call' rack (1.6.8) lib/rack/handler/webrick.rb:88:in `service' /Users/swarn/.rbenv/versions/2.3.1/lib/ruby/2.3.0/webrick/httpserver.rb:140:in `service' /Users/swarn/.rbenv/versions/2.3.1/lib/ruby/2.3.0/webrick/httpserver.rb:96:in `run' /Users/swarn/.rbenv/versions/2.3.1/lib/ruby/2.3.0/webrick/server.rb:296:in `block in start_thread'

您能否帮我解决这个问题或将我重定向到有人可以提供帮助的地方？感谢。