Question

我是Ruby On Rails的新手。我一直在尝试使用 rails generate model 命令创建一个名为Book的模型，但是我收到以下错误消息：

F:\Faizul\Noah-Data\Backup\Ruby\Rails App\library>rails generate model Book
C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/mysql2-0.4.10-x64-mingw32/lib/mysql2/mysql2.rb:2:in `require': cannot load such file -- mysql2/2.4/mysql2 (LoadError)
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/mysql2-0.4.10-x64-mingw32/lib/mysql2/mysql2.rb:2:in `<top (required)>'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/mysql2-0.4.10-x64-mingw32/lib/mysql2.rb:31:in `require'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/mysql2-0.4.10-x64-mingw32/lib/mysql2.rb:31:in `<top (required)>'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/runtime.rb:81:in `require'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/runtime.rb:81:in `block (2 levels) in require'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/runtime.rb:76:in `each'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/runtime.rb:76:in `block in require'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/runtime.rb:65:in `each'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler/runtime.rb:65:in `require'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/bundler-1.16.1/lib/bundler.rb:114:in `require'
        from F:/Faizul/Noah-Data/Backup/Ruby/Rails App/library/config/application.rb:7:in `<top (required)>'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/command/actions.rb:15:in `require'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/command/actions.rb:15:in `require_application_and_environment!'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/commands/generate/generate_command.rb:19:in `perform'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/command.rb:27:in `run'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in `invoke_command'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/thor-0.20.0/lib/thor.rb:387:in `dispatch'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/command/base.rb:63:in `perform'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/command.rb:44:in `invoke'
        from C:/Ruby24-x64/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/commands.rb:16:in `<top (required)>'
        from bin/rails:4:in `require'
        from bin/rails:4:in `<main>'

采取以下行动来克服这个问题，但失败了:(

卸载mysql2
使用 gem install mysql2命令
添加＆＃39; msql2＆＃39;到我的Gemfile
配置 database.yml 文件，如下所示：

default: &default
  adapter: mysql2
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  timeout: 5000

development:
   adapter: mysql2
   database: library_development
   username: root
   password: root
   host: localhost
   port: 3309
test:
   adapter: mysql2
   database: library_test
   username: root
   password: root
   host: localhost
   port: 3309
production:
   adapter: mysql2
   database: library_production
   username: root
   password: root
   host: localhost
   port: 3309

Answer 1

目前，目前还没有针对Ruby 2.4 for Windows的mysql2二进制文件。

有关详细信息，请参阅this github问题 https://github.com/brianmario/mysql2/issues/861

希望这可以帮到你。

Answer 2

编译你的mysql评论为我工作 https://github.com/brianmario/mysql2/issues/923#issuecomment-361346864

但请注意第3步 而不是

cd＆＃34; C：\ Ruby24-x64 \ bin \ ruby＆＃34; extconf.rb --with-mysql-dir =＆＃34; C：\ Program Files \ MySQL \ MySQL Connector.C 6.1＆＃34;

我做了

＆＃34; C：\ Ruby24-64 \ BIN \红宝石＆＃34; extconf.rb --with-mysql-dir =＆＃34; C：\ Program Files （x86）\ MySQL \ MySQL Connector.C 6.1＆＃34;

不＆＃34; cd＆＃34;在乞讨和我的连接器在＆＃34; C：\ Program Files（x86）＆＃34;文件夹中。

也在步骤＃6 我正在复制

C：\ Ruby24-64 \ lib中\红宝石\宝石\ 2.4.0 \宝石\ mysql2-0.4.10-x64的的mingw32 \分机\ mysql2 \ mysql2.so

到新创建的文件夹

C：\ Ruby24-64 \ lib中\红宝石\宝石\ 2.4.0 \宝石\ mysql2-0.4.10-x64的的mingw32 \ lib中\ mysql2 \ 2.4

编译过程显示了很多警告，但最终rake db：migrate开始为我工作，所以你的代码应该是

Answer 3

请安装Mysql服务器。安装在宝石下面。

的libmysqlclient-dev的要么 Mysql-devl

无法加载此类文件 - mysql2 / 2.4 / mysql2（LoadError）

3 个答案: