Ruby MongoClient:从irb初始化成功，从脚本初始化失败

Question

我试图从脚本初始化MongoClient，但失败了。我所做的只是：

require 'mongo'
include Mongo
client = MongoClient.new("localhost", 27017)

并且由于以下错误而失败：

/var/lib/gems/1.9.1/gems/mongo-1.9.1/lib/mongo/cursor.rb:43:in `initialize': undefined method `connection' for nil:NilClass (NoMethodError)
    from /var/lib/gems/1.9.1/gems/mongo-1.9.1/lib/mongo/db.rb:564:in `new'
    from /var/lib/gems/1.9.1/gems/mongo-1.9.1/lib/mongo/db.rb:564:in `command'
    from /var/lib/gems/1.9.1/gems/mongo-1.9.1/lib/mongo/mongo_client.rb:591:in `block in check_is_master'
    from /usr/lib/ruby/1.9.1/timeout.rb:68:in `timeout'
    from /var/lib/gems/1.9.1/gems/mongo-1.9.1/lib/mongo/mongo_client.rb:590:in `check_is_master'
    from /var/lib/gems/1.9.1/gems/mongo-1.9.1/lib/mongo/mongo_client.rb:474:in `connect'
    from /var/lib/gems/1.9.1/gems/mongo-1.9.1/lib/mongo/mongo_client.rb:698:in `setup'
    from /var/lib/gems/1.9.1/gems/mongo-1.9.1/lib/mongo/mongo_client.rb:155:in `initialize'
    from ./test.rb:52:in `new'
    from ./test.rb:52:in `<main>'

但是，当我从irb尝试完全相同的东西时，它是有效的。

Ruby版本为：

ruby 1.9.3p194（2012-04-20修订版35410）[x86_64-linux]

irb是：

/usr/bin/irb1.9.1--版本irb 0.9.6（09/06/30）

我也尝试过需要"rubygems"，但据我所知，Ruby 1.9并不需要它。我忘了什么吗？

Answer 1

此问题已通过重新安装ruby解决。我从来没有发现问题是什么，是什么原因造成的。

感谢大家的帮助。