来自Gem的Rails中未初始化的常量

Question

我对Rails相当陌生，正在追逐我的尾巴，试图让Rails应用程序在我的服务器上运行。本地在我的Mac上，一切工作正常，但是当我在Ubuntu服务器上运行它时，出现NameError (uninitialized constant Api::V1::TestController::Headless)错误。我已经更新了捆绑商和其他职位中建议的相关宝石。我确信Headless是我的宝石文件，是最新的，并且安装正确。我正在和Watir Webdriver一起使用Headless。任何有关可能导致此错误的建议将不胜感激。

红宝石版本：2.2.3

有问题的控制器：

class Api::V1::TestController < ApplicationController 
    respond_to :json 

    def index 
    respond_with "test controller" 
    end 

    def create 

    event_submit(params[:json_event]) 

    respond_to do |format| 
     if (@log.present?) 
     format.json { render text: "Log: " + @log } 
     else 
     format.json { render text: "Error, no log" } 
     end 
    end 

    end 

    def nul_check(param) 
    param ||= "none" 
    return param 
    end 


    def event_submit(params) 

    @log = "" 

    #initialize the log 
    @log = "" 
    #set the browser that we will use to chrome for testing 
    #use headless 
    headless = Headless.new 
    headless.start 

    browser = Watir::browser.start 'www.google.com' 

    @log += browser.title 

    end 

end 

的Gemfile中：

source 'https://rubygems.org' 


# Bundle edge Rails instead: gem 'rails', github: 'rails/rails' 
gem 'rails', '4.2.4' 
# Use postgresql as the database for Active Record 
gem 'pg' 
# 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', '~> 4.1.0' 

# 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' 
# 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 

#Api gems 
gem 'active_model_serializers' 
gem 'deathbycaptcha' 
gem 'rspec' 
gem 'responders', '~> 2.0' 


#Driver gems 
gem 'watir-extensions-element-screenshot' 
gem 'selenium-webdriver' 
gem 'chromedriver-helper' 
gem 'headless' 
gem 'nokogiri' 
gem 'watir-webdriver' 

group :development, :test do 
    gem 'sqlite3' 
    # Call 'byebug' anywhere in the code to stop execution and get a debugger console 
    gem 'byebug' 
end 

group :development do 
    # Access an IRB console on exception pages or by using <%= console %> in views 
    gem 'web-console', '~> 2.0' 

    # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring 
    gem 'spring' 
end 


gem 'unicorn' 

Answer 1

问题原来是服务器所有权。用户，在我的情况下，铁轨没有宝石的所有权，因为我已经运行我自己的帐户bundle install。一个chmod为rails用户照顾的问题！

Answer 2

的问题是，Rails将在Headless常数Api::V1::TestController命名空间下。

您应该使用::Headless（常数的绝对路径类型）。