Ubuntu 14.04-安装pg（0.18.2）时发生错误，并且Bundler无法继续

Question

This issue doesn't let me go ahead and I don't know whether it's possible for me to deploy my Rails App ever on Heroku.

When I try bundle install by having gem 'pg' in my Gemfile it gives following error.

An error occurred while installing pg (0.18.2), and Bundler cannot continue.

Make sure that gem install pg -v '0.18.2' succeeds before bundling.

However, when I try sudo gem install pg it says Successfully installed pg-0.18.2 1 gem installed

But when I try to run the app locally or deploy on Heroku it gives me the same error again. By using sqlite3 in development mode, all is well, but the same issue occurs on Heroku because Heroku doesn't support sqlite3.

Answer 1

Do you have PostgreSQL installed locally? If not, that might be the reason for that (having gem 'pg' is not enough to install it locally). You will have to run sudo apt-get install postgresql postgresql-contrib to install.

You do not need it installed locally to push to Heroku though...as long as you have gem 'pg' . You can do so by setting up a different group in your Gemfile specifically for production. Something like:

group :development, :test do
  gem 'sqlite3',     '1.3.9'
end
group :production do
  gem 'pg',             '0.17.1'
  gem 'rails_12factor', '0.0.2'
end

Answer 2

first thing is you must include the pg gem in production and sqlite in development and test environment in gem file

group :development, :test do
  gem 'sqlite3'
end
gem 'pg', group: :production

then bundle gems excluding the production environment

bundle install --without production

you could then commit and push on the heroku.