Ruby on rails Gem:：LoadError:指定'；postgresql'；用于数据库适配器，但未加载gem

救救我！输入“mina deploy”获取以下信息：

我的“/home/deploy/inscope/shared/config/database.yml”看起来：

生产：
适配器：postgresql
编码：unicode
数据库：***
用户名：***
密码：***
主机：本地主机
雷克流产了！
Gem:：LoadError:为数据库适配器指定了“postgresql”，但未加载Gem。将“gem”pg“添加到您的gem文件中（并确保其版本为ActiveRecord所要求的最低版本）。
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active\u record/connection\u adapters/connection\u specification.rb:190:in“spec中的rescue”
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active\u record/connection\u adapters/connection\u specification.rb:187:in'spec'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active\u record/connection\u handling.rb:50:在“建立连接”中
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active_record/railtie.rb:129:in `块（2层）in'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active\u support/lazy\u load\u hooks.rb:38:in'instance\u eval'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active\u support/lazy\u load\u hook.rb:38:in“execute\u hook”
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active\u-support/lazy\u-load\u-hooks.rb:28:in'block-in-on\u-load'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active\u support/lazy\u load\u hooks.rb:27:in'each'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active\u support/lazy\u load\u hooks.rb:27:in“on\u load”
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active_-record/railtie.rb:118:in'block-in'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/initializable.rb:30:in'instance_exec'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/initializable.rb:30:in'run'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/initializable.rb:55:“运行中的块初始化器”
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/initializable.rb:54:in'run_initializers'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/application.rb:288:in'initialize！'
/home/deploy/inscope/tmp/build-142737137923106/config/environment.rb:5:in`'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_-support/dependencies.rb:247:in'require'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_-support/dependencies.rb:247:in'block-in-require'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active\u support/dependencies.rb:232:“加载\u依赖项”中
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_-support/dependencies.rb:247:in'require'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/application.rb:264:in'require_environment！'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/application.rb:367:in“运行中的块\任务\块”
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-2.2.4/lib/sprockets/rails/task.rb:64:define中的“块（2层）”中
Gem:：LoadError:pg不是捆绑包的一部分。将其添加到文件中。
/home/deploy/.rvm/gems/ruby-2.2.0/gems/bundler-1.9.1/lib/bundler/rubygems_integration.rb:261:in`block in replace_gem'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active\u record/connection\u adapters/postgresql\u adapter.rb:13:in`'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_-support/dependencies.rb:247:in'require'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_-support/dependencies.rb:247:in'block-in-require'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active\u support/dependencies.rb:232:“加载\u依赖项”中
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_-support/dependencies.rb:247:in'require'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active\u record/connection\u adapters/connection\u specification.rb:188:in'spec'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active\u record/connection\u handling.rb:50:在“建立连接”中
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active_record/railtie.rb:129:in `块（2层）in'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active\u support/lazy\u load\u hooks.rb:38:in'instance\u eval'
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active\u support/lazy\u load\u hook.rb:38:in“execute\u hook”
/home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active\u support
production:
  adapter: postgresql
  encoding: unicode
  database: ***
  username: ***
  password: ***
  host: localhost

rake aborted!
   Gem::LoadError: 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).
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active_record/connection_adapters/connection_specification.rb:190:in `rescue in spec'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active_record/connection_adapters/connection_specification.rb:187:in `spec'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active_record/connection_handling.rb:50:in `establish_connection'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active_record/railtie.rb:129:in `block (2 levels) in <class:Railtie>'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:28:in `block in on_load'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:27:in `each'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:27:in `on_load'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active_record/railtie.rb:118:in `block in <class:Railtie>'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/initializable.rb:30:in `instance_exec'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/initializable.rb:30:in `run'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/initializable.rb:55:in `block in run_initializers'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/initializable.rb:54:in `run_initializers'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/application.rb:288:in `initialize!'
   /home/deploy/inscope/tmp/build-142737137923106/config/environment.rb:5:in `<top (required)>'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:247:in `require'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:247:in `block in require'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:232:in `load_dependency'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:247:in `require'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/application.rb:264:in `require_environment!'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/application.rb:367:in `block in run_tasks_blocks'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-2.2.4/lib/sprockets/rails/task.rb:64:in `block (2 levels) in define'
   Gem::LoadError: pg is not part of the bundle. Add it to Gemfile.
   /home/deploy/.rvm/gems/ruby-2.2.0/gems/bundler-1.9.1/lib/bundler/rubygems_integration.rb:261:in `block in replace_gem'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active_record/connection_adapters/postgresql_adapter.rb:13:in `<top (required)>'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:247:in `require'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:247:in `block in require'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:232:in `load_dependency'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:247:in `require'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active_record/connection_adapters/connection_specification.rb:188:in `spec'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active_record/connection_handling.rb:50:in `establish_connection'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active_record/railtie.rb:129:in `block (2 levels) in <class:Railtie>'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:28:in `block in on_load'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:27:in `each'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:27:in `on_load'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activerecord-4.1.0/lib/active_record/railtie.rb:118:in `block in <class:Railtie>'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/initializable.rb:30:in `instance_exec'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/initializable.rb:30:in `run'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/initializable.rb:55:in `block in run_initializers'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/initializable.rb:54:in `run_initializers'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/application.rb:288:in `initialize!'
   /home/deploy/inscope/tmp/build-142737137923106/config/environment.rb:5:in `<top (required)>'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:247:in `require'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:247:in `block in require'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:232:in `load_dependency'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:247:in `require'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/application.rb:264:in `require_environment!'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/railties-4.1.0/lib/rails/application.rb:367:in `block in run_tasks_blocks'
   /home/deploy/inscope/tmp/build-142737137923106/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-2.2.4/lib/sprockets/rails/task.rb:64:in `block (2 levels) in define'
   Tasks: TOP => environment
   (See full trace by running task with --trace)

gem 'pg'

    Gem::LoadError: 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).