Mongoid 在 ruby 1.9.3 上失败

Posted 2023-03-10

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【中文标题】Mongoid 在 ruby 1.9.3 上失败【英文标题】：Mongoid fails on ruby 1.9.3 【发布时间】：2012-11-09 15:35:27 【问题描述】：

所以我在玩 mongo 的东西。创建了一个新的 heroku 应用程序，为其添加了一个 mongolab 选项，但是每个 mongoid 方法都失败了。

我用谷歌搜索了一下，看起来这个问题在 1.9.3 之前的 ruby 中很常见，但我运行的是 1.9.3。

这是最简单的失败示例：

require 'sinatra'
require 'mongoid'
require 'json'
require "sinatra/reloader" if development?

Mongoid.load!("mongoid.yml")

class Company
    include Mongoid::Document

    field :code, type: String
    field :sector, type: String
    field :share_id, type: Integer
    field :jse_code, type: Integer
end

get '/' do
    "Hello" 
end

get '/company' do
    Company.exists?
end

无论我在本地（针对 mongolab db）还是在 heroku 上运行它，我都会遇到同样的错误：

12:22:33 web.1  | NoMethodError - undefined method `match' for nil:NilClass:
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/sessions/mongo_uri.rb:49:in `initialize'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/sessions/factory.rb:103:in `new'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/sessions/factory.rb:103:in `parse'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/sessions/factory.rb:62:in `create_session'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/sessions/factory.rb:43:in `default'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/sessions.rb:109:in `default'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/sessions.rb:378:in `__session__'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/sessions.rb:213:in `mongo_session'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/sessions.rb:157:in `collection'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/contextual/mongo.rb:216:in `initialize'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/contextual.rb:47:in `new'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/contextual.rb:47:in `create_context'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/contextual.rb:30:in `context'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/contextual.rb:20:in `rescue in exists?'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/contextual.rb:18:in `exists?'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/mongoid-3.0.13/lib/mongoid/finders.rb:43:in `exists?'
12:22:33 web.1  |   app.rb:22:in `block in <main>'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:1265:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:1265:in `block in compile!'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `[]'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `block (3 levels) in route!'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:851:in `route_eval'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:835:in `block (2 levels) in route!'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:872:in `block in process_route'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:870:in `catch'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:870:in `process_route'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:834:in `block in route!'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:833:in `each'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:833:in `route!'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:936:in `dispatch!'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:769:in `block in call!'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `block in invoke'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `catch'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:921:in `invoke'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:769:in `call!'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:755:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/rack-protection-1.2.0/lib/rack/protection/xss_header.rb:22:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/rack-protection-1.2.0/lib/rack/protection/path_traversal.rb:16:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/rack-protection-1.2.0/lib/rack/protection/json_csrf.rb:17:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/rack-protection-1.2.0/lib/rack/protection/base.rb:47:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/rack-protection-1.2.0/lib/rack/protection/xss_header.rb:22:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/rack-1.4.1/lib/rack/logger.rb:15:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/rack-1.4.1/lib/rack/commonlogger.rb:20:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:136:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:129:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/rack-1.4.1/lib/rack/head.rb:9:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/rack-1.4.1/lib/rack/methodoverride.rb:21:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/showexceptions.rb:21:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:99:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:1389:in `block in call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:1471:in `synchronize'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/sinatra-1.3.3/lib/sinatra/base.rb:1389:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/thin-1.5.0/lib/thin/connection.rb:81:in `block in pre_process'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/thin-1.5.0/lib/thin/connection.rb:79:in `catch'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/thin-1.5.0/lib/thin/connection.rb:79:in `pre_process'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/eventmachine-1.0.0/lib/eventmachine.rb:1037:in `call'
12:22:33 web.1  |   /Users/sdx/.rvm/gems/ruby-1.9.3-p327/gems/eventmachine-1.0.0/lib/eventmachine.rb:1037:in `block in spawn_threadpool'
12:22:33 web.1  | 127.0.0.1 - - [21/Nov/2012 12:22:33] "GET /__sinatra__/500.png HTTP/1.1" 200 31056 0.0062

我做错了什么？

更新这是我的 mongoid.yml：

production:
    sessions:
        default:
            uri: <%= ENV['MONGOLAB_URI'] %>
            options:
                skip_version_check: true
                safe: true
development:
    sessions:
        default:
            uri: <%= ENV['MONGOLAB_URI'] %>

【问题讨论】：

【参考方案1】：

根据堆栈跟踪，mongo_uri 的构造函数似乎被传递了一个空值。我会在您的mongoid.yml 中检查以下内容：

它在正确的位置/load! 的参数指向正确的位置配置正确如果它引用了在您的环境中设置的任何环境变量（例如，MONGOLAB_URI 用于 MongoLab Heroku 插件）

来自mongo_uri.rb:49 的相关行，其中抛出异常：

  # Create the new uri from the provided string.
  #
  # @example Create the new uri.
  #   MongoUri.new(uri)
  #
  # @param [ String ] string The uri string.
  #
  # @since 3.0.0
  def initialize(string)
    @match = string.match(URI)
  end

【讨论】：

我用我的 mongoid.yml 文件更新了这个问题。我很确定它会读取它，因为它会抱怨，例如没有默认值，或者 env 变量是否错误所以你是对的，在本地这是一个连接问题。在服务器上，尽管我的 Gemfile 说了什么，它使用的是 1.9.1。因此，两个不同的问题导致了完全的混乱。【参考方案2】：

这与heroku在编译资产时不使用环境变量有关。

使用 heroku 的这个实验室功能将有助于解决这个问题：https://devcenter.heroku.com/articles/labs-user-env-compile

【讨论】：

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