Heroku 在我的 Rails 应用程序 Gemfile 中无法识别“pg”gem

Question

我仍然是 Ruby on Rails 的新手，而我是 Heroku 的新手。

我已将我的 Rails 应用程序设置为在开发和生产中使用 postgres 而不是 sqlite3，并且我已将“gem 'pg'”放入我的 Gemfile。在本地，我的应用运行良好。

让它在 Heroku 上运行是另一回事。在我将我的应用程序推送到 Heroku 后，当我输入“heroku run rake db:migrate”时，它告诉我，“rake aborted！为数据库适配器指定了 'postgresql'，但 gem 没有加载。添加 gem 'pg'到您的 Gemfile。”

是的，gem 'pg' 在我的 Gemfile 中，但我仍然收到此错误。

什么给了？

这是我的 Gemfile 现在的样子：

source 'https://rubygems.org'
ruby '2.0.0'
gem 'rails',        '4.0.1'
gem 'pg'

group :assets do
end

gem 'bcrypt-ruby', '~> 3.1.2'
gem 'haml'
gem 'devise', '3.0.0.rc'
gem 'protected_attributes'
gem 'sass-rails', '4.0.1'
gem 'uglifier', '2.1.1'
gem 'coffee-rails', '4.0.1'
gem 'jquery-rails', '3.0.4'
gem 'turbolinks', '1.1.1'
gem 'jbuilder', '1.0.2'
gem 'knockout-rails'

# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.0.0'

# To use Jbuilder templates for JSON
# gem 'jbuilder'

# Use unicorn as the app server
# gem 'unicorn'

# Deploy with Capistrano
# gem 'capistrano'

# To use debugger
# gem 'debugger'

group :doc do
  gem 'sdoc', '0.3.20', require: false
end

group :production do
  gem 'unicorn'
  gem 'rails_12factor', '0.0.2'
end

这是我的 database.yml 的样子：

development:
  adapter: postgresql
  encoding: unicode
  database: financemeter
  pool: 5
  password:

test:
  adapter: postgresql
  encoding: unicode
  database: financemeter
  pool: 5
  timeout: 5000

production:
  adapter: postgresql
  database: dbe67fgdnnqg88
  pool: 5
  timeout: 5000
  user: njatxlpjjrzfoe
  password: HULxOtPALAk4FnzZe-_737TvPc

这里是我尝试在 heroku 上迁移时的完整错误日志。 （同样，在本地我很好。如果这很重要，我正在本地使用 MacBook。）

/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.1/lib/active_record/connection_adapters/connection_specification.rb:58:in `rescue in resolve_hash_connection'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.1/lib/active_record/connection_adapters/connection_specification.rb:55:in `resolve_hash_connection'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.1/lib/active_record/connection_adapters/connection_specification.rb:46:in `resolve_string_connection'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.1/lib/active_record/connection_adapters/connection_specification.rb:32:in `spec'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.1/lib/active_record/connection_handling.rb:39:in `establish_connection'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.1/lib/active_record/railtie.rb:176:in `block (2 levels) in <class:Railtie>'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.1/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.1/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.1/lib/active_support/lazy_load_hooks.rb:28:in `block in on_load'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.1/lib/active_support/lazy_load_hooks.rb:27:in `each'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.1/lib/active_support/lazy_load_hooks.rb:27:in `on_load'
/app/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.1/lib/active_record/railtie.rb:174:in `block in <class:Railtie>'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.1/lib/rails/initializable.rb:30:in `instance_exec'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.1/lib/rails/initializable.rb:30:in `run'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.1/lib/rails/initializable.rb:55:in `block in run_initializers'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.1/lib/rails/initializable.rb:54:in `run_initializers'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.1/lib/rails/application.rb:215:in `initialize!'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.1/lib/rails/railtie/configurable.rb:30:in `method_missing'
/app/config/environment.rb:5:in `<top (required)>'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.1/lib/active_support/dependencies.rb:229:in `require'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.1/lib/active_support/dependencies.rb:229:in `block in require'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.1/lib/active_support/dependencies.rb:214:in `load_dependency'
/app/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.1/lib/active_support/dependencies.rb:229:in `require'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.1/lib/rails/application.rb:189:in `require_environment!'
/app/vendor/bundle/ruby/2.0.0/gems/railties-4.0.1/lib/rails/application.rb:250:in `block in run_tasks_blocks'

Answer 1

你的机器上安装了 postgresql 吗？
如果没有，请使用 homebrew 安装 pg。
安装后，请确保初始化 pg 数据存储。

另外，根据您的 pg 的安装方式，您可能需要在 database.yml 文件中指定用户名和主机

  username: someuser_on_pg
  host: localhost

希望有帮助