Rails 5应用程序开发环境中的NoServerAvailable

Question

我正试图通过mLab连接到现有的rails console数据库。每次查询(例如GameScore.all.count、User.all.count)时，都会返回以下错误消息：

Mongo::Error::NoServerAvailable: No server is available matching    preference: #<Mongo::ServerSelector::Primary:0x70240308536180 tag_sets=[] max_staleness=nil> using server_selection_timeout=30 and local_threshold=0.015 from /Users/-/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/mongo-2.4.1/lib/mongo/server_selector/selectable.rb:115:in `select_server'

下面是如何设置我的mongoid.yml文件：

development:
  clients:
    default:
      uri: 'mongodb://username:password@host:port/db_name'
      options:
        consistency: :strong
        max_retries: 30
        retry_interval: 1
        timeout: 15

会很感激你的帮助。现在真的很困惑。

Answer 1

解决了。不得不降级为Rails 4.2.7和mongoid 4。