mongoid 的 gem-install 在 Ruby 中抛出一个未初始化的常量，在 irb 中工作 [英] gem-install of mongoid throws an uninitialized constant in Ruby, works in irb

问题描述

我正在用 Ruby/MongoDB 编写一个存储推文的脚本.在我安装了 gem 之后 mongoid，这个第一步代码抛出了一个错误:

I am writing a script with Ruby/MongoDB that stores Tweets. After I gem-installed mongoid, this first-steps code throws an error:

require 'rubygems'
require 'mongo'
require 'mongoid'

Mongoid.database = Mongo::Connection.new('localhost').db('db')
# snippet from http://rujmah.posterous.com/using-mongoid-without-rails

注意.这不是 Rails 应用，而是一个终端脚本.我得到的错误是:

NB. This is no Rails app, but a Terminal script. The error I get is:

./mongoid.rb:10: uninitialized constant Mongoid (NameError)
    from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
    from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:36:in `require'
    from mongoid.rb:3

它在 irb 中工作，我正在运行 ruby​​ 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0].

It works in irb and I'm running ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0].

我做错了什么?

不知何故，我让它工作了.唉，快一年过去了，我真的不记得是怎么回事了.下次我会努力做得更好.

Somehow I got it to work. Alas, nearly a year on, I really can’t remember how. I will try to do better next time.

推荐答案

我在尝试让 Bullet gem 正常工作时遇到了同样的问题.我的解决方案是简单地将 gem 'mongoid', github: 'mongoid/mongoid' 作为 Gemfile 的第一行.我觉得这很奇怪，但这就是我摆脱那个错误的方式.

I hit the same issue while trying to get Bullet gem to work. The solution for me was to simply move gem 'mongoid', github: 'mongoid/mongoid' as the first line of the Gemfile. I find it really odd but that was how I got rid of that error.

我使用的是 Ruby 2.1.0 和 Rails 4.0.0

I am using Ruby 2.1.0 and Rails 4.0.0

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