如何从Gemfile安装gem？

Question

我想为我的项目添加代码覆盖率并注册coveralls.io并使用以下命令创建Gemfile:

gem 'coveralls', require: false

但是如何从Gemfile安装gem呢？

Answer 1

bundle install一旦创建了Gemfile,就在shell中运行该命令.

此命令将查看您的Gemfile并在指定的版本上安装相关的Gems.

安装Gemfiles是因为在你的Gemfile中你指出了可以从中下载gem的源.

您只需键入bundle initshell 即可创建Gemfile

我添加了一个Gemfile示例供您参考:

source "https://rubygems.org"  # where gems will be downloaded from
ruby "2.2.3"  # ruby version, change for the one you use

gem "sinatra"
gem "sinatra-flash"
gem "sinatra-partial"
gem "bcrypt"
gem "dm-validations"
gem "dm-transactions"
gem "data_mapper"
gem "dm-postgres-adapter"
gem "pg"
gem "database_cleaner"

group :test do   # you can make groups for test, development, production..
  gem "rspec"
  gem "capybara"
  gem "rspec-sinatra"
  gem "cucumber"
  gem "coveralls", require: false
end

Answer 2

如果您没有捆绑包,请先安装捆绑包

gem install bundler或者sudo gem install bundler如果您没有所需的权限.Bundler是一个管理gem依赖关系的gem.

然后你可以按照上面的说明创建gemfile,之后你可以发出命令

bundle install