Rails錯誤 - 未初始化的常量

Question

在設置新的rails項目時，我在rails s命令中遇到了以下問題

john-MacBook-Pro:coffee john$ rails s
/Users/john/Development/coffee/config/application.rb:10:in `<module:Coffee>': uninitialized constant Coffee::Rails::Application (NameError)
    from /Users/john/Development/coffee/config/application.rb:9:in `<top (required)>'
    from /Users/john/.rvm/gems/ruby-2.1.2/gems/railties-4.0.3/lib/rails/commands.rb:74:in `require'
    from /Users/john/.rvm/gems/ruby-2.1.2/gems/railties-4.0.3/lib/rails/commands.rb:74:in `block in <top (required)>'
    from /Users/john/.rvm/gems/ruby-2.1.2/gems/railties-4.0.3/lib/rails/commands.rb:71:in `tap'
    from /Users/john/.rvm/gems/ruby-2.1.2/gems/railties-4.0.3/lib/rails/commands.rb:71:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'

究竟是什么造成了這種情況，我該如何解決？

謝謝你的期待。

Application.rb文件：

require File.expand_path('../boot', __FILE__)

require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(:default, Rails.env)

module Coffee
  class Application < Rails::Application
    # Settings in config/environments/* take precedence over those specified here.
    # Application configuration should go into files in config/initializers
    # -- all .rb files in that directory are automatically loaded.

    # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
    # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
    # config.time_zone = 'Central Time (US & Canada)'

    # The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
    # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
    # config.i18n.default_locale = :de
  end
end

Answer 1

您似乎已將您的應用程序稱為“咖啡”。 這意味着您的config/application.rb文件中有一個module Coffee聲明。

Rails使用coffee-rails gem來支持rails應用程序中的coffee腳本，這也聲明了一個module Coffee 。

您無意中使用您選擇的應用程序名稱創建了名稱沖突。