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我正在尝试创建一个新的 Rails 4.1 项目mysql2 0.3.15并获得以下错误和堆栈跟踪。当我强制mysql2 0.3.14时没有错误。

$ rake db:migrate
rake aborted!
TypeError: can't convert nil into String
/usr/local/Cellar/Gems/1.9/gems/mysql2-0.3.15/lib/mysql2/client.rb:67:in `connect'
/usr/local/Cellar/Gems/1.9/gems/mysql2-0.3.15/lib/mysql2/client.rb:67:in `initialize'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/connection_adapters/mysql2_adapter.rb:18:in `new'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/connection_adapters/mysql2_adapter.rb:18:in `mysql2_connection'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:435:in `new_connection'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:445:in `checkout_new_connection'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:416:in `acquire_connection'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:351:in `block in checkout'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:350:in `checkout'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in `block in connection'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:264:in `connection'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:541:in `retrieve_connection'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/connection_handling.rb:113:in `retrieve_connection'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/connection_handling.rb:87:in `connection'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/migration.rb:910:in `initialize'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/migration.rb:807:in `new'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/migration.rb:807:in `up'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/migration.rb:785:in `migrate'
/usr/local/Cellar/Gems/1.9/gems/activerecord-4.1.0/lib/active_record/railties/databases.rake:34:in `block (2 levels) in <top (required)>'

这是我的database.yml文件

default: &default
  adapter: mysql2
  encoding: utf8
  pool: 5
  username: root
  password: "asdf"
  timeout: 5000

development:
  <<: *default
  database: dev
  socket: /tmp/mysql.sock 

production:
  <<: *default
  database: prod
  socket: /var/lib/mysql/mysql.sock

我的 MySQL 客户端库是 OSX 10.9.2 上的 5.6.16

更新 如果我在我的文件中指定password,host和，这个错误就会消失。现在出于某种原因需要这些吗？portdatabase.yml

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1 回答 1

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我发现我已经硬编码了我的GEM_PATH，GEM_HOME而不是让 gems 安装在适当的rbenv文件夹中。由于我同时安装了 ruby​​ 1.9 和 2.1.1，所以当我安装新的mysql2gem 时，C 扩展是针对 2.1.1 编译的，并在我尝试连接到数据库时导致上述类型错误。在文件夹下删除GEM_PATH并GEM_HOME重新安装我的 gem.rbenv解决了这个问题。

于 2014-05-08T19:12:02.063 回答