Mongo Mapper的軌道

Question

這是學習鐵軌的最糟糕的一天。已經無法連接和配置sqlite3，mysql數據庫我轉向mongo映射器並面臨相同的問題。當我嘗試啓動rails服務器我得到以下幾點：

/usr/local/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/active_support/dependencies.rb:239:in `require': no such file to load -- mongo_mapper (LoadError) 

我已經安裝了mongo_mapper寶石，但是當我做「這mongo_mapper」它不返回任何東西。

這裏是我的mongo_config.rb文件放在初始化文件夾中：

require "rubygems" 
require "mongo_mapper" 

MongoMapper.database = "blog-#{Rails.env}" 

更新1：

我更改爲以下：

require "rubygems" 
include MongoMapper 

MongoMapper.database = "blog-#{Rails.env}" 

現在我得到以下錯誤：

/Users/azamsharp/Projects/railsprojects/blog/config/initializers/mongo_config.rb:2: uninitialized constant MongoMapper (NameError) 

Answer 1

嘗試刪除需要的線路並將其替換爲include MongoMapper

Answer 2

您必須使用捆綁器和導軌3。不要試圖不使用它。以下內容添加到您的Gemfile

source 'http://gemcutter.org' 
source 'http://rubygems.org' 

gem "rails", "3.0.7" 
gem 'bson', "1.1.1" 
gem 'bson_ext', "1.1.1" 
gem 'mongo_mapper' 

然後運行

bundle install 

然後rails server將工作

Answer 3

爲了得到mongo_mapper在Rails的工作（下Rails的3.1測試，應在Rails的3.0。 x），您必須按照下列步驟操作：

1. 在Gemfile中，a DD的mongo_mapper和BSON寶石：

   gem 'mongo_mapper' 
   gem 'bson_ext' 
   

2. 運行捆綁安裝

3. 在config /目錄下創建一個mongo.yml文件，像這樣的：

   # config/mongo.yml 
   
   defaults: &defaults 
       host: 127.0.0.1 
       port: 27017 
   
   development: 
       <<: *defaults 
       database: db_development 
       username: user 
       password: password 
   
   test: 
       <<: *defaults 
       database: db_test 
   
   # set these environment variables on your prod server 
   production: 
       <<: *defaults 
       database: 
       username: 
       password: 
   

4. 在配置/ initializers目錄下，創建一個mongo.rb文件是這樣的：

   # config/initializers/mongo.rb 
   
   #include MongoMapper 
   
   db_config = YAML::load(File.read(File.join(Rails.root, "/config/mongo.yml"))) 
   # 
   if db_config[Rails.env] && db_config[Rails.env]['adapter'] == 'mongodb' 
       mongo = db_config[Rails.env] 
       MongoMapper.connection = Mongo::Connection.new(mongo['host'] || 'localhost', 
                  mongo['port'] || 27017, 
                 :logger => Rails.logger) 
       MongoMapper.database = mongo['database'] 
   
       if mongo['username'] && mongo['password'] 
       MongoMapper.database.authenticate(mongo['username'], mongo['password']) 
       end 
   end 
   
   # Used for image uploads 
   # CarrierWave.configure do |config| 
   # mongo = db_config[Rails.env] 
   # config.grid_fs_database = mongo['database'] 
   # config.grid_fs_host = mongo['host'] || 'localhost' 
   # config.grid_fs_access_url = "gridfs" 
   # config.grid_fs_username = mongo['username'] 
   # config.grid_fs_password = mongo['password'] 
   # end 
   
   # It's also possible to define indexes in the the model itself; however, 
   # a few issues are being worked out still. This is a temporary solution. 
   # Comment.ensure_index([["story_id", 1], ["path", 1], ["points", -1]]) 
   # MongoMapper.ensure_indexes! 
   
   # Handle passenger forking. 
   # if defined?(PhusionPassenger) 
   # PhusionPassenger.on_event(:starting_worker_process) do |forked| 
   #  MongoMapper.database.connect_to_master if forked 
   # end 
   # end 
   
   if defined?(PhusionPassenger) 
       PhusionPassenger.on_event(:starting_worker_process) do |forked| 
        MongoMapper.connection.connect if forked 
       end 
   end 
   

5. 在啓動rails服務器之前啓動mongod服務器並享受！