环境

Rails 5.2.2
ruby 2.5.3p105 (2018-10-18 revision 65156) [x64-mingw32]

问题

当rails、ruby、sqlite3都安装完成，顺利创建完专案的时候，运行服务访问专案时又报了一个错

Puma caught this error: Error loading the 'sqlite3' Active Record adapter. Missing a gem it depends on? can't activate sqlite3 (~> 1.3.6), already activated sqlite3-1.4.0. Make sure all dependencies are added to Gemfile. (LoadError)
C:/Ruby25/lib/ruby/gems/2.5.0/gems/bundler-2.0.1/lib/bundler/rubygems_integration.rb:408:in `block (2 levels) in replace_gem'
……

这是我在网上找了一个解决方案

修改Gemfile文件
gem 'sqlite3', '~> 1.3.6'
改完之后运行命令
bundle install
安装完成后
rails s
结果服务没起来

又报了下面的错误

Traceback (most recent call last):
        22: from bin/rails:4:in `<main>'
        21: from bin/rails:4:in `require'
        20: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/commands.rb:18:in `<top (required)>'
        19: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/command.rb:46:in `invoke'
        18: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/command/base.rb:65:in `perform'
        17: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/thor-0.20.3/lib/thor.rb:387:in `dispatch'
        16: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/thor-0.20.3/lib/thor/invocation.rb:126:in `invoke_command'
        15: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/thor-0.20.3/lib/thor/command.rb:27:in `run'
        14: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/commands/server/server_command.rb:142:in `perform'
        13: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/commands/server/server_command.rb:142:in `tap'
         5: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/bundler-2.0.1/lib/bundler/runtime.rb:76:in `each'
         4: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/bundler-2.0.1/lib/bundler/runtime.rb:81:in `block (2 levels) in require'
         3: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/bundler-2.0.1/lib/bundler/runtime.rb:81:in `require'
         2: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/sqlite3-1.3.13-x64-mingw32/lib/sqlite3.rb:2:in `<top (required)>'
         1: from C:/Ruby25/lib/ruby/gems/2.5.0/gems/sqlite3-1.3.13-x64-mingw32/lib/sqlite3.rb:6:in `rescue in <top (required)>'
C:/Ruby25/lib/ruby/gems/2.5.0/gems/sqlite3-1.3.13-x64-mingw32/lib/sqlite3.rb:6:in `require': cannot load such file -- sqlite3/sqlite3_native (LoadError)

后来我又找了针对上面错误的解决方案

修改Gemfile文件
gem 'sqlite3', git: "https://github.com/larskanis/sqlite3-ruby", branch: "add-gemspec"
然后运行命令
bundle install
安装完成后
rails s
这回服务运行成功。

在昨天遇到这个问题时，我尝试了第一个方案，结果遇到第二个问题，在找解决方案的时候，有人曾经重新安装了ruby、rails、还有sqlite3，结果就好用了，但是我尝试了他的方法，用了好长时间安装，还是不好用，可能是我机器的有些环境跟他配置的不同。今天重新从第一个问题开始解决，针对问题找解决方案，一下下的排查，没想到这么快就解决了，将这个方法记录下来，让遇到跟我类似问题的少走弯路。