ruby-on-rails - database.yml &references 不工作

Question

我们刚刚将虚拟机升级到我认为相同的 ruby​​ 配置(通过 RVM...Ruby 1.9.2、Rails 3.0.7、DataMapper 1.1.0)。最大的区别是我们从 MySQL 5.0 升级到 5.1。

出于某种原因，在我们的旧 VM 上运行的完全相同的代码/database.yml 现在在我们的新 VM 尝试连接到数据库时失败了。

问题是这个 YAML:

mysql_defaults: &mysql_defaults
  adapter: mysql
  encoding: UTF-8
  username: user
  password: pass
  host: localhost

development:
  <<: *mysql_defaults
  database: devdb

production:
  <<: *mysql_defaults
  database: productiondb
  host: master.db.site.com

正在扩展到:

  "mysql_defaults" => {
    "adapter"=>"mysql",
    "encoding"=>"UTF-8",
    "username"=>"user",
    "password"=>"pass",
    "host"=>"localhost"
  },
  "development" => {
    "adapter"=>"mysql",
    "encoding"=>"UTF-8",
    "username"=>"user",
    "password"=>"pass",
    "host"=>"localhost"
  },
  "production" => {
    "adapter"=>"mysql",
    "encoding"=>"UTF-8",
    "username"=>"user",
    "password"=>"pass",
    "host"=>"localhost"
  }

代替:

  "mysql_defaults" => {
    "adapter"=>"mysql",
    "encoding"=>"UTF-8",
    "username"=>"user",
    "password"=>"pass",
    "host"=>"localhost"
  },
  "development" => {
    "adapter"=>"mysql",
    "encoding"=>"UTF-8",
    "username"=>"user",
    "password"=>"pass",
    "host"=>"localhost",
    "database"=>"devdb"
  },
  "production" => {
    "adapter"=>"mysql",
    "encoding"=>"UTF-8",
    "username"=>"user",
    "password"=>"pass",
    "host"=>"master.db.site.com",
    "database"=>"productiondb"
  }

以前有人遇到过这种情况吗？

根据 Gemfile.lock(为了理智起见，我删除了它并再次运行 bundle install)，所有安装的依赖项都是相同的(即 Gemfile.lock 在新旧设置之间没有区别)。 database.yml 也没有。

Answer 1

Psych 是新的 YAML 解析器，它可能更好但不能合并哈希键。

这应该有帮助 http://pivotallabs.com/users/mkocher/blog/articles/1692-yaml-psych-and-ruby-1-9-2-p180-here-there-be-dragons