紅寶石的Gemfile不能添加PostgreSQL的寶石

Question

這裏是我的Gemfile：

source 'https://rubygems.org' 

#my added gems 
gem 'pg', '~> 0.17.1' 
gem 'rails_12factor', '0.0.2' 

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails' 
gem 'rails', '4.1.0' 
# Use sqlite3 as the database for Active Record 
gem 'sqlite3' 
# Use SCSS for stylesheets 
gem 'sass-rails', '~> 4.0.3' 
# Use Uglifier as compressor for JavaScript assets 
gem 'uglifier', '>= 1.3.0' 
# Use CoffeeScript for .js.coffee assets and views 
gem 'coffee-rails', '~> 4.0.0' 
# See https://github.com/sstephenson/execjs#readme for more supported runtimes 
# gem 'therubyracer', platforms: :ruby 

# Use jquery as the JavaScript library 
gem 'jquery-rails' 
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks 
gem 'turbolinks' 
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder 
gem 'jbuilder', '~> 2.0' 
# bundle exec rake doc:rails generates the API under doc/api. 
gem 'sdoc', '~> 0.4.0',   group: :doc 

# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring 
gem 'spring',  group: :development 

您可以在我添加了pg寶石線4號線看到。

An error occurred while installing pg (0.17.1), and Bundler cannot continue. 
Make sure that `gem install pg -v '0.17.1'` succeeds before bundling. 

任何人都知道如何解決這個問題：保存和運行在我的終端，我得到以下錯誤，此錯誤bundle install後？

Answer 1

您是否在捆綁安裝之前嘗試了消息所說的內容？

gem install pg -v '0.17.1' 

另外，如果你是在本地運行這一點，你需要postrgre只是應用程序部署到像Heroku的服務器（你正在使用SQLite/MySQL的本地），將其添加到生產環境是這樣的：

group :production do 
    gem 'pg' 
end 

，並再次運行

bundle install 

。