使用 Rails 3.2.2 安装 Mongoid答案

【问题标题】：Install Mongoid with Rails 3.2.2使用 Rails 3.2.2 安装 Mongoid
【发布时间】：2012-03-16 19:07:55
【问题描述】：

我正在尝试将 Mongoid 与 rails 3.2.2 一起使用，我已添加：

gem "mongoid", "~> 2.4"
gem "bson_ext", "~> 1.5"

到我的 gemfile，运行：

bundle install

然后

rails g mongoid:config

然后编辑了我的 application.rb 所以：

#require "active_record/railtie" commented because of mongoid
require "action_controller/railtie"
require "action_mailer/railtie"
require "active_resource/railtie"
require "sprockets/railtie"

我有 mongoid.yml:

development:
  host: localhost
  database: boards_development

test:
  host: localhost
  database: boards_test

# set these environment variables on your prod server
production:
  host: <%= ENV['MONGOID_HOST'] %>
  port: <%= ENV['MONGOID_PORT'] %>
  username: <%= ENV['MONGOID_USERNAME'] %>
  password: <%= ENV['MONGOID_PASSWORD'] %>
  database: <%= ENV['MONGOID_DATABASE'] %>
  # slaves:
  #   - host: slave1.local
  #     port: 27018
  #   - host: slave2.local
  #     port: 27019

我已经删除了 mongoid 文档上所说的 databse.yml，但是在运行 rails server 时出现如下错误：

matteo@matteo-stable:~/Matteo/Dev/boards$ rails s
=> Booting WEBrick
=> Rails 3.2.2 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
Exiting
/home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/railtie/configuration.rb:85:in `method_missing': undefined method `active_record' for #<Rails::Application::Configuration:0x8eb762c> (NoMethodError)
    from /home/matteo/Matteo/Dev/boards/config/environments/development.rb:26:in `block in <top (required)>'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/railtie/configurable.rb:24:in `class_eval'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/railtie/configurable.rb:24:in `configure'
    from /home/matteo/Matteo/Dev/boards/config/environments/development.rb:1:in `<top (required)>'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.2.2/lib/active_support/dependencies.rb:251:in `require'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.2.2/lib/active_support/dependencies.rb:251:in `block in require'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.2.2/lib/active_support/dependencies.rb:236:in `load_dependency'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/activesupport-3.2.2/lib/active_support/dependencies.rb:251:in `require'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/engine.rb:571:in `block in <class:Engine>'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/initializable.rb:30:in `instance_exec'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/initializable.rb:30:in `run'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/initializable.rb:55:in `block in run_initializers'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/initializable.rb:54:in `each'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/initializable.rb:54:in `run_initializers'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/application.rb:136:in `initialize!'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/railtie/configurable.rb:30:in `method_missing'
    from /home/matteo/Matteo/Dev/boards/config/environment.rb:5:in `<top (required)>'
    from /home/matteo/Matteo/Dev/boards/config.ru:4:in `require'
    from /home/matteo/Matteo/Dev/boards/config.ru:4:in `block in <main>'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/builder.rb:51:in `instance_eval'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/builder.rb:51:in `initialize'
    from /home/matteo/Matteo/Dev/boards/config.ru:1:in `new'
    from /home/matteo/Matteo/Dev/boards/config.ru:1:in `<main>'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/builder.rb:40:in `eval'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/builder.rb:40:in `parse_file'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/server.rb:200:in `app'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/commands/server.rb:46:in `app'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/server.rb:301:in `wrapped_app'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/rack-1.4.1/lib/rack/server.rb:252:in `start'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/commands/server.rb:70:in `start'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/commands.rb:55:in `block in <top (required)>'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/commands.rb:50:in `tap'
    from /home/matteo/.rvm/gems/ruby-1.9.3-p125/gems/railties-3.2.2/lib/rails/commands.rb:50:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'
matteo@matteo-stable:~/Matteo/Dev/boards$ rails s
=> Booting WEBrick
=> Rails 3.2.2 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
host is not a valid option for Mongo::Connection
[2012-03-16 20:00:08] INFO  WEBrick 1.3.1
[2012-03-16 20:00:08] INFO  ruby 1.9.3 (2012-02-16) [i686-linux]
[2012-03-16 20:00:08] INFO  WEBrick::HTTPServer#start: pid=9936 port=3000
^C[2012-03-16 20:01:03] INFO  going to shutdown ...
[2012-03-16 20:01:03] INFO  WEBrick::HTTPServer#start done.
Exiting

离开关于活动记录的行我没有收到任何错误，但是：

host is not a valid option for Mongo::Connection

我应该安装其他东西吗？

【问题讨论】：

哦不，这只是 stackoverflow
我有一个类似的问题（除了主机问题）——但你不应该删除 database.yml，根据他们的文档：“现在你有一个 mongoid.yml 你可以”等不及删除那个讨厌的 database.yml 了，对吧？这样做，你会开始到处收到 ActiveRecord 错误。” mongoid.org/docs/installation/configuration.html@pierre-louis-g 有正确的修复，如下。我注释掉了提到活动记录的两行，我的安装现在可以工作了。

标签： ruby-on-rails mongodb mongoid

【解决方案1】：

您从应用中删除了 ActiveRecord，但您仍有其配置选项。在 environment.rb 和 application.rb（以及 /config 下的其他文件）中查找“active_record”。

【讨论】：

【解决方案2】：

下次尝试使用rails模板。它们将帮助您更快地开始，并将添加许多您很快需要的其他不错的宝石：

https://github.com/RailsApps/rails3-application-templates

如果您想设置一个没有活动记录的 rails3 项目，请使用此命令并稍后将 mongoid 添加到 Gemfile 中，无需任何麻烦：

rails new appname --skip-active-record

【讨论】：

【解决方案3】：

您还必须对 config/environments/development.rb 中的代码行进行注释

从 Rails 3.2 开始，他们在这个文件中添加了 2 行调用“active_record”的代码。评论一下吧

  # Raise exception on mass assignment protection for Active Record models
  config.active_record.mass_assignment_sanitizer = :strict

  # Log the query plan for queries taking more than this (works
  # with SQLite, MySQL, and PostgreSQL)
  config.active_record.auto_explain_threshold_in_seconds = 0.5

编辑：关于主机问题，这很奇怪，但答案是否定的，你不应该安装其他东西......

【讨论】：