我可以将chef.json的部分内容移动到数据库吗？

我正在使用vagrant + chef-solo + barkshelf插件.在我的Vagrantfile中我有这个:

chef.json = {
  "postgresql" => {
    "password" => {
      "postgres" => "password"
    }
  },
  "database" => {
    "create" => ["chembl_18"]
  },
  "build_essential" => {
    "compiletime" => true
  }
}

如果我在这里添加更多配置,我的Vagrantile将很快变得凌乱.我试图改变这一点,所以我创建了databags/postgresql/json_attribs.json包含以下内容的文件:

{
  "postgresql": {
    "password": {
      "postgres": "iloverandompasswordsbutthiswilldo"
    }
  }
}

和我的Vagrantfile中修改的内容:

chef.json = {
  :postgresql => ["json_attribs"],
  "database" => {
    "create" => ["chembl_18"]
  },
...
}

但它不起作用,我得到:

==> default:  58>>   default['postgresql']['dir'] = "/etc/postgresql/#{node['postgresql']['version']}/main"
...
==> default: [2014-05-14T12:36:51+00:00] ERROR: Running exception handlers
==> default: [2014-05-14T12:36:51+00:00] ERROR: Exception handlers complete
==> default: [2014-05-14T12:36:51+00:00] FATAL: Stacktrace dumped to /var/chef/cache/chef-stacktrace.out
==> default: [2014-05-14T12:36:51+00:00] FATAL: TypeError: can't convert String into Integer

那么我应该如何以及在何处放置这些设置以将它们分成几个单独的文件？