How to install gems from Gemfile?

Question

I want to add code coverage to my project and sign up coveralls.io and create Gemfile with:

gem 'coveralls', require: false

but how can I install the gem from Gemfile?

Answer 1

run the command bundle install in your shell, once you have your Gemfile created.

This command will look your Gemfile and install the relevant Gems on the indicated versions.

The Gemfiles are installed because in your Gemfile you are pointing out the source where the gems can be downloaded from.

Your can create a Gemfile just by typing bundle init in your shell

I add a Gemfile example for your reference:

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

First install bundler if you don't have it

gem install bundler or sudo gem install bundler if you don't have the required permissions. Bundler is a gem that manages gem dependencies.

then you can follow the above instruction for creating the gemfile, after which you can issue the command

bundle install