爲數據庫適配器指定'mysql'，但未加載gem。添加'寶石「mysql'`您的Gemfile

我在database.yml中設置以下配置爲數據庫適配器指定'mysql'，但未加載gem。添加'寶石「mysql'`您的Gemfile

production: 
    adapter: mysql 
    database: some_db 
    host: localhost 
    port: 3306 
    pool: 5 
    timeout: 15000 
    username: root 
    password: password 
    socket: /var/lib/mysql/mysql.sock

我的Gemfile有

group :production do 
    gem 'mysql', '~>2.8.1' 
end

當我做寶石列表我得到以下：

bigdecimal (1.2.0) 
builder (3.2.2) 
bundler (1.5.3) 
bundler-unload (1.0.2) 
bunny (0.7.9) 
chef (10.24.0) 
chef-zero (1.7.3) 
ci_reporter (1.9.1) 
coderay (1.1.0) 
diff-lcs (1.2.5) 
erubis (2.7.0) 
executable-hooks (1.3.1) 
gem-wrappers (1.2.4) 
hashie (2.0.5) 
highline (1.6.20) 
io-console (0.4.2) 
ipaddress (0.8.0) 
json (1.7.7) 
method_source (0.8.2) 
mime-types (2.1, 1.25.1) 
minitest (4.7.5, 4.3.2) 
minitest-chef-handler (1.0.2) 
mixlib-authentication (1.3.0) 
mixlib-cli (1.4.0) 
mixlib-config (2.1.0) 
mixlib-log (1.6.0) 
mixlib-shellout (1.3.0) 
moneta (0.6.0) 
net-ssh (2.8.0) 
net-ssh-gateway (1.2.0) 
net-ssh-multi (1.1) 
ohai (6.20.0) 
polyglot (0.3.4) 
pry (0.9.12.6) 
psych (2.0.0) 
puma (1.6.3) 
rack (1.5.2) 
rake (0.9.6) 
rdoc (4.0.0) 
rest-client (1.6.7) 
rubygems-bundler (1.4.2) 
rvm (1.11.3.9) 
slop (3.4.7) 
systemu (2.5.2) 
test-unit (2.0.0.0) 
treetop (1.4.15) 
uuidtools (2.1.4) 
yajl-ruby (1.2.0)

當我做了束節目就說明mysql (2.8.1)

當我嘗試運行bundle exec rake db:migrate RAILS_ENV=production我得到以下錯誤

rake aborted! 
Specified 'mysql' for database adapter, but the gem is not loaded. Add `gem 'mysql'` to your Gemfile. 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activerecord-4.0.3/lib/active_record/connection_adapters/connection_specification.rb:58:in `rescue in resolve_hash_connection' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activerecord-4.0.3/lib/active_record/connection_adapters/connection_specification.rb:55:in `resolve_hash_connection' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activerecord-4.0.3/lib/active_record/connection_adapters/connection_specification.rb:46:in `resolve_string_connection' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activerecord-4.0.3/lib/active_record/connection_adapters/connection_specification.rb:30:in `spec' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activerecord-4.0.3/lib/active_record/connection_handling.rb:39:in `establish_connection' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activerecord-4.0.3/lib/active_record/railtie.rb:176:in `block (2 levels) in <class:Railtie>' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activesupport-4.0.3/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activesupport-4.0.3/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activesupport-4.0.3/lib/active_support/lazy_load_hooks.rb:28:in `block in on_load' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activesupport-4.0.3/lib/active_support/lazy_load_hooks.rb:27:in `each' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activesupport-4.0.3/lib/active_support/lazy_load_hooks.rb:27:in `on_load' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activerecord-4.0.3/lib/active_record/railtie.rb:174:in `block in <class:Railtie>' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/railties-4.0.3/lib/rails/initializable.rb:30:in `instance_exec' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/railties-4.0.3/lib/rails/initializable.rb:30:in `run' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/railties-4.0.3/lib/rails/initializable.rb:55:in `block in run_initializers' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/railties-4.0.3/lib/rails/initializable.rb:54:in `run_initializers' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/railties-4.0.3/lib/rails/application.rb:215:in `initialize!' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/railties-4.0.3/lib/rails/railtie/configurable.rb:30:in `method_missing' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/config/environment.rb:7:in `<top (required)>' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activesupport-4.0.3/lib/active_support/dependencies.rb:229:in `require' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activesupport-4.0.3/lib/active_support/dependencies.rb:229:in `block in require' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activesupport-4.0.3/lib/active_support/dependencies.rb:214:in `load_dependency' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/activesupport-4.0.3/lib/active_support/dependencies.rb:229:in `require' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/railties-4.0.3/lib/rails/application.rb:189:in `require_environment!' 
/var/www/rack_apps/wolfe_manager/releases/c3115a7066257a3c72016438c99a13bb6d88e989e635f81942b4a6060d91a256/vendor/cache/ruby/2.0.0/gems/railties-4.0.3/lib/rails/application.rb:250:in `block in run_tasks_blocks' 
Tasks: TOP => db:migrate => environment 
(See full trace by running task with --trace)

配置 Rails的-4 紅寶石 - 2 幫助嗎？

來源

2014-02-27 kauschan

-1

應該爲所有環境設置數據庫驅動程序，而不僅僅是production。它沒有安裝在您的開發環境中，因爲它不被視爲是必需的。

來源

2014-02-27 16:34:36 tadman

但是這就是爲什麼我指定RAILS_ENV =生產..所以它只拾取生產 – kauschan

這是一個變量傳入，而不是一個真正的環境變量。如果你將它推到前面，它可能會工作，比如'RAILS_ENV =生產捆綁包exec rake db：migrate'，其中bundler有機會解釋它。通常情況下，您應該在shell配置文件中正確地在生產服務器上設置「RAILS_ENV」和/或「RACK_ENV」。 – tadman

感謝您讓我知道正確的方式......我嘗試將其他env添加到yaml文件中......並且RAILS_ENV = production bundle exec rake db：migrate ...我知道它正在拾取生產ENV配置...但不知道爲什麼它找不到寶石 – kauschan

爲數據庫適配器指定'mysql'，但未加載gem。添加'寶石「mysql'`您的Gemfile

回答

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