所以...第一次向 StackOverflow 提问...
我按照 Rails Guides 和 RailsApps Project 将现有的 Rails 4.2.5 应用程序（使用 Ruby 2.2.4）转换为 Rails 5.1.3 应用程序（使用 Ruby 2.4.1）。
启动开发服务器会产生：
Taruns-iMac:Play_Ball tarunchattoraj$ rails s
=> Booting Puma
=> Rails 5.1.3 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
Puma starting in single mode...
* Version 3.9.1 (ruby 2.4.1-p111), codename: Private Caller
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:3000
Use Ctrl-C to stop
这正是我所期望的。
然而，导航到 localhost:3000 会产生 ActionController 错误：
Started GET "/" for 127.0.0.1 at 2017-08-13 11:05:38 -0400
(0.2ms) SELECT "schema_migrations"."version" FROM "schema_migrations" ORDER BY "schema_migrations"."version" ASC
ActionController::RoutingError (Couldn't find Api::KeepScoresHelper, expected it to be defined in helpers/api/keep_scores_helper.rb):
app/controllers/application_controller.rb:1:in `<top (required)>'
app/controllers/welcome_controller.rb:1:in `<top (required)>'
我希望看到我的应用程序在页面上正常运行。
我的问题：
是什么导致了这个 ActionController::RoutingError (无法找到...) 以及如何纠正它？
This question https://stackoverflow.com/questions/34562224/getting-couldnt-find-sessionshelper-expected-it-to-be-defined-in-helpers-ses似乎说到点上了。我尝试了“触摸”所有帮助文件的解决方案，但没有成功。
当我从 Rails 4.2.5 转换到 5.1.3 时，我运行 $ rails app:update我覆盖了大多数文件——那些文件中没有特定于我的应用程序的代码，但我选择不覆盖 config/routes.rb。
配置/routes.rb：
Rails.application.routes.draw do
resources :alerts
get 'games/decide_game_view' => 'games#decide_game_view', as: :decide_game_view
resources :games
resources :game_hitting_stats
resources :game_pitching_stats
resources :locations
resources :players
get 'welcome/index'
get 'welcome/about'
resources :users do
resources :players
end
resources :sessions, only: [:new, :create, :destroy]
resources :teams do
resources :notes
end
# namespace :api, defaults: {format: :http} do
namespace :api do
match '/texts', to: 'texts#preflight', via: [:options]
resources :texts, only: [:create]
match '/keepscore/teams', to: 'keep_scores#preflight', via: [:options]
get 'keepscore/teams' => 'keep_scores#get_teams', as: :get_teams
match '/keepscore/roster', to: 'keep_scores#preflight', via: [:options]
get 'keepscore/roster' => 'keep_scores#get_roster', as: :get_roster
match '/keepscore/post_game_stats', to: 'keep_scores#preflight', via: [:options]
post 'keepscore/post_game_stats' => 'keep_scores#post_game_stats', as: :post_game_stats
end
# The priority is based upon order of creation: first created -> highest priority.
# See how all your routes lay out with "rake routes".
# You can have the root of your site routed with "root"
# root 'welcome#index'
# Example of regular route:
# get 'products/:id' => 'catalog#view'
# Example of named route that can be invoked with purchase_url(id: product.id)
# get 'products/:id/purchase' => 'catalog#purchase', as: :purchase
# Example resource route (maps HTTP verbs to controller actions automatically):
# resources :products
# Example resource route with options:
# resources :products do
# member do
# get 'short'
# post 'toggle'
# end
#
# collection do
# get 'sold'
# end
# end
# Example resource route with sub-resources:
# resources :products do
# resources :comments, :sales
# resource :seller
# end
# Example resource route with more complex sub-resources:
# resources :products do
# resources :comments
# resources :sales do
# get 'recent', on: :collection
# end
# end
# Example resource route with concerns:
# concern :toggleable do
# post 'toggle'
# end
# resources :posts, concerns: :toggleable
# resources :photos, concerns: :toggleable
# Example resource route within a namespace:
# namespace :admin do
# # Directs /admin/products/* to Admin::ProductsController
# # (app/controllers/admin/products_controller.rb)
# resources :products
# end
root 'welcome#index'
end
ActionController 似乎告诉我它找不到 KeepScoresHelper 模块并且它在 helpers/api/keep_scores_helper.rb 中查找。但该文件存在请参阅应用程序控制器和辅助树结构的图片 https://i.stack.imgur.com/hlqFU.png.
helpers/api/keep_scores_helper.rb 的内容：
module API::KeepScoresHelper
end
Gemfile:
source 'https://rubygems.org'
ruby "2.4.1"
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '5.1.3'
gem 'puma'
gem 'pundit'
gem 'bcrypt'
gem 'active_model_serializers', '~> 0.10.0'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2.2'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby
# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
gem 'jquery-turbolinks'
gem 'bootstrap-sass'
gem 'figaro'
gem 'pry'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0', group: :doc
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'
# Use Unicorn as the app server
# gem 'unicorn'
# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development
group :production do
gem 'pg'
gem 'rails_12factor'
end
group :test do
gem 'pundit-matchers', '~>1.0.1'
end
group :development, :test do
# Call 'byebug' anywhere in the code to stop execution and get a debugger console
gem 'listen'
gem 'byebug'
gem 'web-console', '~> 3.5.1'
# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring'
gem 'rspec-rails'
gem 'shoulda'
gem 'faker'
gem 'factory_girl_rails'
gem 'rails-controller-testing'
end
group :development do
# Access an IRB console on exception pages or by using <%= console %> in views
gem 'sqlite3'
end
当然，非常感谢任何帮助......
