Mysql Mac OSX Rails无法运行Rake命令

我正在尝试运行rake命令为我的项目构建数据库。但我遇到了以下错误

Harshas-MacBook-Pro:noise harshamv$ rake db:create
Couldn't create database for {"adapter"=>"mysql2", "encoding"=>"utf8", "database"=>"noise_development", "pool"=>5, "username"=>"hmv", "password"=>2206, "socket"=>"/var/run/mysqld/mysqld.sock"}, {:charset=>"utf8", :collation=>"utf8_unicode_ci"}
(If you set the charset manually, make sure you have a matching collation)
Couldn't create database for {"adapter"=>"mysql2", "encoding"=>"utf8", "database"=>"noise_test", "pool"=>5, "username"=>"root", "password"=>"root", "socket"=>"/var/run/mysqld/mysqld.sock"}, {:charset=>"utf8", :collation=>"utf8_unicode_ci"}
(If you set the charset manually, make sure you have a matching collation)

Rake数据库：迁移

Harshas-MacBook-Pro:noise harshamv$ rake db:migrate
rake aborted!
Mysql2::Error: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/mysql2-0.3.15/lib/mysql2/client.rb:67:in `connect'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/mysql2-0.3.15/lib/mysql2/client.rb:67:in `initialize'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/connection_adapters/mysql2_adapter.rb:18:in `new'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/connection_adapters/mysql2_adapter.rb:18:in `mysql2_connection'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:440:in `new_connection'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:450:in `checkout_new_connection'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:421:in `acquire_connection'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:356:in `block in checkout'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:355:in `checkout'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in `block in connection'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:264:in `connection'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:546:in `retrieve_connection'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/connection_handling.rb:79:in `retrieve_connection'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/connection_handling.rb:53:in `connection'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/migration.rb:863:in `initialize'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/migration.rb:764:in `new'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/migration.rb:764:in `up'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/migration.rb:742:in `migrate'
/Users/harshamv/.rvm/gems/ruby-2.1.2/gems/activerecord-4.0.0/lib/active_record/railties/databases.rake:42:in `block (2 levels) in <top (required)>'
/Users/harshamv/.rvm/gems/ruby-2.1.2/bin/ruby_executable_hooks:15:in `eval'
/Users/harshamv/.rvm/gems/ruby-2.1.2/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)

---

所以你的database.yml中的连接信息是错误的，它说mysql可以在socket文件/var/run/mysqld/mysqld.sock中找到，但不能。正确的信息取决于机器的设置方式。如果您可以从mysql CLI进行连接，那么您使用哪些连接参数来启动运行的

mysql

命令？这将向您展示如何在databases.yml中添加内容，以便以与mysql cli相同的方式进行连接。方法是使用默认值注释掉它所使用的套接字。

development:
  adapter: mysql2
  encoding: utf8
  database: noise_development
  pool: 5
  username: hmv
  password: *******
  socket: /var/run/mysqld/mysqld.sock