从 Rails 3.2.22 升级到 Rails 4.2.4 时出错

Question

我正在尝试将我们的应用程序从 Rails 3.2.22 升级到 Rails 4.2.4 和 Ruby 2.2.3.

这是我目前所做的：

1. 已修改 Gemfile 以指定 rails, "~> 4.2.4"
2. bundle
3. bundle update rails

完整成绩单如下。

我们的 Gemfile 中没有指定 ActiveRecord，所以我不明白它锁定了什么或在哪里修复它？

Craigs-MacBook-Pro~/Work/mbc(master|✔) % git checkout -b rails-424
Switched to a new branch 'rails-424'
Craigs-MacBook-Pro~/Work/mbc(rails-424|✔) % vim Gemfile
Craigs-MacBook-Pro~/Work/mbc(rails-424|✚1) % bundle
Fetching gem metadata from https://rubygems.org/........
Fetching version metadata from https://rubygems.org/...
Fetching dependency metadata from https://rubygems.org/..
You have requested:
  rails ~> 4.2.4

The bundle currently has rails locked at 3.2.22.
Try running `bundle update rails`
Craigs-MacBook-Pro~/Work/mbc(rails-424|✚1) % bundle update rails
Fetching gem metadata from https://rubygems.org/........
Fetching version metadata from https://rubygems.org/...
Fetching dependency metadata from https://rubygems.org/..
Resolving dependencies............
Bundler could not find compatible versions for gem "activerecord":
  In Gemfile:
    activerecord (< 4.3, >= 3.1) ruby

    activerecord (< 5.0, >= 3.0) ruby

    vestal_versions (>= 0) ruby depends on
      activerecord (~> 3.0) ruby

    activerecord (> 3.0.0) ruby

    rails (~> 4.2.4) ruby depends on
      activerecord (= 4.2.4) ruby
Craigs-MacBook-Pro~/Work/mbc(rails-424|✚1) % 

Answer 1

vestal_versions gem 依赖于 ActiveRecord 3.0.

您需要在 Gemfile 中取消指定 vestal_versions gem 的版本，或者指定为 2.0.0 然后：

bundle update rails vestal_versions