从 Ruby on Rails 4.2.7.1 升级到 5.0.1——仍然尝试使用 railties 4.2.7.1

Question

我正在创建一个网站，但不小心安装了 Ruby on Rails 版本 4 而不是版本 5，我想升级到最新版本，以便使用我所拥有的版本中当前缺少的一些功能我的系统。

我已尝试遵循本指南：

http://railsapps.github.io/updating-rails.html

我安装了rvm 并按顺序运行了所有的预备程序，直到本节：

rvm use ruby-2.3.1@rails5.0 --create
gem install rails
rails -v

我遇到问题的地方。 rvm use ruby-2.3.1@rails5.0 --create 输出：

ruby-2.3.1 - #gemset created /home/dev/.rvm/gems/ruby-2.3.1@rails5.0
ruby-2.3.1 - #generating rails5.0 wrappers..........
Using /home/dev/.rvm/gems/ruby-2.3.1 with gemset rails5.0

很好。 Gem install rails 也顺利进行，安装了所有 36 个 gem，包括：

Fetching: rails-5.0.1.gem (100%)
Successfully installed rails-5.0.1

和

Fetching: railties-5.0.1.gem (100%)
Successfully installed railties-5.0.1

但是，当我之后直接运行 rails -v 时，我得到：

Could not find proper version of railties (4.2.7.1) in any of the sources  
Run `bundle install` to install missing gems.

但是，当我运行 bundle install 时，系统会恢复到 rails 4.2.7.1。

我是否需要做一些额外的事情来安装/链接/任何 railties 4.2.7.1，并阻止系统恢复到原始版本的 rails？我不太使用rails，所以我对配置不是特别熟悉。也许我需要更改我的应用程序中的配置文件？

Answer 1

问题出在包含旧版本号的 Gemfile 中。我更新了以下内容：

source 'https://rubygems.org'


# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '5.0.1'
# Use mysql as the database for Active Record
gem 'mysql2', '>= 0.3.13', '< 0.5'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0.6'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 3.0.4'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2.1'
# 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'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.4.1'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.1', 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 :development, :test do
  # 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

然后运行bundle update，然后运行bundle install，现在有了 Rails 5.0.1。感谢 Iceman 建议查看 Gemfile！