无法使用Rails 5连接到Heroku上的安装数据库

Question

Not sure what I am doing wrong, I tried just leaving out the production section in my database.yml but that didn't work, now I have this:

development:
  ...

test:
  ...

production:
  database: myapp_production
  pool: 5

My gemfile:

gem 'pg', :group => :production
gem 'mysql2', '>= 0.3.18', '< 0.5', :group => [:development, :test]

I am getting this error when running:

Running rake db:setup on ⬢ still-crag-69600... up, run.8579 (Free)
rake aborted!
ActiveRecord::AdapterNotSpecified: 'production' database is not configured. Available: ["development", "test"]
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-5.1.4/lib/active_record/connection_adapters/connection_specification.rb:246:in `resolve_symbol_connection'
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-5.1.4/lib/active_record/connection_adapters/connection_specification.rb:227:in `resolve_connection'
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-5.1.4/lib/active_record/connection_adapters/connection_specification.rb:141:in `resolve'
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-5.1.4/lib/active_record/connection_handling.rb:55:in `establish_connection'
/app/vendor/bundle/ruby/2.3.0/gems/activerecord-5.1.4/lib/active_record/tasks/database_tasks.rb:139:in `create_current'

Answer 1

You need to add this under production:

  adapter: postgresql
  url: <%= ENV['DATABASE_URL'] %>

Ensure that you have created a postgresql addon . DATABASE_URL environment variable is set automatically when you add a heroku postgresql addon.

Answer 2

Try below code in database.yml:

development:
  adapter: postgresql
  encoding: utf8
  reconnect: false
  database: db_name
  pool: 5
  username: root
  password: root

production:
  adapter: postgresql
  encoding: utf8
  reconnect: false
  database: db_name
  pool: 5
  username: root
  password: root

test:
  adapter: postgresql
  encoding: utf8
  reconnect: false
  database: db_name
  pool: 5
  username: root
  password: root