在 Heroku 上部署 Ruby on Rails 应用程序时出现“未加载 postgresql gem”错误

Question

I am trying to use postgresql with Ruby on Rails on Heroku but got an error

Specified 'postgresql' for database adapter, but the gem is not loaded. Add `gem 'pg'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord). (Gem::LoadError)

Please help me to solve this issue.

Answer 1

This worked for me

gem 'pg', '~> 0.20'

Thanks to Piers C

Got this answer from

Heroku and Rails: Gem Load Error with Postgres, however it is Specified in GEMFILE

Answer 2

Add pg in gemfile

 gem 'pg', '~> 0.20'

then bundle update & commit Gemfile & Gemfile.lock to heroku.
simple include like gem 'pg' will not work.

Answer 3

In your Gemfile

group :production do
  gem 'pg'
end

Then run bundle install and try to deploy on Heroku.

If you want to use PostgreSQL on all environments and not only in production (recommended) add the gem outside the :production group and remove other database adapters such as sqlite .

As a side note, you may also want to add the rails_12factor gem as suggested by Heroku.

Answer 4

我将以下版本添加到我的 gemfile 中，它已解决。

gem "pg", "~> 0.18"