Mongodb 使用mongoid的Rails应用程序。。。（Mongoid:：Errors:：NoSessionConfig）：找不到名为'；默认值'；

关于 我已经做了所有必要的改变。。。问题仍然存在

spec_helper.rb文件

ENV["RAILS_ENV"] ||= 'test'
require File.expand_path("../../config/environment", FILE)
require 'rspec/rails'
require 'rspec/autorun'
require 'rails/mongoid'

Gemfile

gem 'rails', '4.0.0'
gem 'rspec-rails', '~>2.14.0'
gem 'mongoid', git: 'https://github.com/mongoid/mongoid.git'
gem 'bson_ext'

蒙哥德

development:
  sessions:
    default:
      database: mongo_demo_development
    hosts:
      - localhost:27017
    options:        
 options:

test:
  sessions:
    default:
      database: mongo_demo_test
      hosts:
        - localhost:27017
      options:
        consistency: :strong      
        max_retries: 1
        retry_interval: 0

以下是我使用$rails s运行rails服务器时生成的错误日志

/home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/sessions/factory.rb:27:in create': (Mongoid::Errors::NoSessionConfig)
Problem:
No configuration could be found for a session named 'default'.
Summary:
When attempting to create the new session, Mongoid could not find a session configuration for the name: 'default'. This is necessary in order to know the host, port, and options needed to connect.
Resolution:
Double check your mongoid.yml to make sure under the sessions key that a configuration exists for 'default'. If you have set the configuration programatically, ensure that 'default' exists in the configuration hash.
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/sessions.rb:137:inwith_name'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/sessions.rb:390:in __session__'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/sessions.rb:227:inmongo_session'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/sessions.rb:171:in collection'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/contextual/mongo.rb:265:ininitialize'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/contextual.rb:51:in new'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/contextual.rb:51:increate_context'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/contextual.rb:34:in context'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/contextual.rb:18:inlast'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/findable.rb:130:in last'
from /home/nikunj/Practice/mongo_demo/app/rules/myrule_book.rb:5:inclass:Myrule_Book'
from /home/nikunj/Practice/mongo_demo/app/rules/myrule_book.rb:3:in <top (required)>'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:423:inload'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:423:in block in load_file'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:615:innew_constants_in'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:422:in load_file'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:323:inrequire_or_load'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:462:in load_missing_constant'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:183:inconst_missing'
from /home/nikunj/Practice/mongo_demo/config/environments/development.rb:30:in block in <top (required)>'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/railtie/configurable.rb:24:inclass_eval'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/railtie/configurable.rb:24:in configure'
from /home/nikunj/Practice/mongo_demo/config/environments/development.rb:1:in'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:228:in require'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:228:inblock in require'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:213:in load_dependency'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:228:inrequire'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/engine.rb:591:in block (2 levels) in <class:Engine>'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/engine.rb:590:ineach'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/engine.rb:590:in block in <class:Engine>'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/initializable.rb:30:ininstance_exec'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/initializable.rb:30:in run'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/initializable.rb:55:inblock in run_initializers'
from /home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:150:in block in tsort_each'
from /home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:183:inblock (2 levels) in each_strongly_connected_component'
from /home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:210:in block (2 levels) in each_strongly_connected_component_from'
from /home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:219:ineach_strongly_connected_component_from'
from /home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:209:in block in each_strongly_connected_component_from'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/initializable.rb:44:ineach'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/initializable.rb:44:in tsort_each_child'
from /home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:203:ineach_strongly_connected_component_from'
from /home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:182:in block in each_strongly_connected_component'
from /home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:180:ineach'
from /home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:180:in each_strongly_connected_component'
from /home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:148:intsort_each'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/initializable.rb:54:in run_initializers'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/application.rb:215:ininitialize!'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/railtie/configurable.rb:30:in method_missing'
from /home/nikunj/Practice/mongo_demo/config/environment.rb:5:in'
from /home/nikunj/Practice/mongo_demo/config.ru:3:in require'
from /home/nikunj/Practice/mongo_demo/config.ru:3:inblock in '
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385@global/gems/rack-1.5.2/lib/rack/builder.rb:55:in instance_eval'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385@global/gems/rack-1.5.2/lib/rack/builder.rb:55:ininitialize'
from /home/nikunj/Practice/mongo_demo/config.ru:in new'
from /home/nikunj/Practice/mongo_demo/config.ru:in'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385@global/gems/rack-1.5.2/lib/rack/builder.rb:49:in eval'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385@global/gems/rack-1.5.2/lib/rack/builder.rb:49:innew_from_string'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385@global/gems/rack-1.5.2/lib/rack/builder.rb:40:in parse_file'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385@global/gems/rack-1.5.2/lib/rack/server.rb:277:inbuild_app_and_options_from_config'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385@global/gems/rack-1.5.2/lib/rack/server.rb:199:in app'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/commands/server.rb:48:inapp'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385@global/gems/rack-1.5.2/lib/rack/server.rb:314:in wrapped_app'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/commands/server.rb:75:instart'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/commands.rb:78:in block in <top (required)>'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/commands.rb:73:intap'
from /home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/commands.rb:73:in <top (required)>'
from bin/rails:4:inrequire'
from bin/rails:4:in `'

/home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/sessions/factory.rb:27:in create'：（mongoid:：Errors:：NoSessionConfig）
问题:
找不到名为“default”的会话的配置。
总结：
尝试创建新会话时，Mongoid找不到名称为“default”的会话配置。这是必要的，以便了解连接所需的主机、端口和选项。
决议：
仔细检查mongoid.yml，确保在会话键下存在“默认”配置。如果以编程方式设置了配置，请确保配置哈希中存在“default”。
from/home/nikunc/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/sessions.rb:137:inwith_name'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/sessions.rb:390:in_uuuusession
from/home/nikunc/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/sessions.rb:227:inmongo_session'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/sessions.rb:171:收藏'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/context/mongo.rb:265:ininitialize'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/context.rb:51:in new'
from/home/nikunc/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/context.rb:51:increate_context'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/context.rb:34:in context'
from/home/nikunc/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/context.rb:18:inslast'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/bundler/gems/mongoid-d52c33bce36a/lib/mongoid/finable.rb:130:in last'
from/home/nikunj/Practice/mongo_demo/app/rules/myrule_book.rb:5:inclass:myrule_book'
from/home/nikunj/Practice/mongo_demo/app/rules/myrule_book.rb:3:in'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active\u support/dependencies.rb:423:inload'
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from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active\u-support/dependencies.rb:183:incontot\u-missing'
from/home/nikunj/Practice/mongo_demo/config/environments/development.rb:30:in block in'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/railtie/configurable.rb:24:inclass_eval'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/railtie/configurable.rb:24:in configure'
from/home/nikunj/Practice/mongo_demo/config/environments/development.rb:1:in'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active\u support/dependencies.rb:228:in require'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active\u support/dependencies.rb:228:inblock-in-require'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active\u support/dependencies.rb:213:in load\u dependenciency'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/activesupport-4.0.0/lib/active\u support/dependencies.rb:228:inrequire'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/engine.rb:591:in block（2层）in'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/engine.rb:590:ineach'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/engine.rb:590:in block in'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/initializable.rb:30:ininstance_exec'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/initializable.rb:30:运行中'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/initializable.rb:55:run_initializer'
from/home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:150:tsort_中的块
from/home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:183:inblock（2级）在每个强连接的组件中
from/home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:210：每个强连接的组件中的块（2个级别）
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from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/initializable.rb:44:ineach'
from/home/nikunj/.rvm/gems/ruby-1.9.3-p385/gems/railties-4.0.0/lib/rails/initializable.rb:44:in-tsort_每个孩子的
from/home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:203:ineach\u强连接\u组件\u from'
from/home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:182:在每个强连接的组件中的块中
from/home/nikunj/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/tsort.rb:180:ineach'
从/家/nikunj
 Mongoid.load!('config/mongoid.yml')