验证者 添加一些不错的ActiveModel / ActiveRecord验证器。 安装 gem install validators 然后将其添加到您的Gemfile中: gem "validators" 用法 注意:某些验证器将需要其他依赖项; 每当您收到诸如gem-name is not part of the bundle. Add it to your project's Gemfile.类的消息时, gem-name is not part of the bundle. Add it to your project's Gemfile. gem-name is not part