执行 rails 的错误

Question

我正在开发一个简单的 Rails 应用程序，它使用 MongoDb 作为数据库（使用 Mongoid）。我一直在应用程序中做我的第一个模型，所以我想使用 rspec 对其进行测试。搜索后，我找到了 rspec-rails 和 mongoid-rspec gems，我按照他们的安装说明进行操作。但是，当我执行：rails g rspec:install，我得到以下错误：

home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/mongoid-3.1.6/lib/mongoid/config/validators/session.rb:99:in `no_database_or_uri?': undefined method `has_key?' for nil:NilClass (NoMethodError)
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/mongoid-3.1.6/lib/mongoid/config/validators/session.rb:45:in `validate_session_database'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/mongoid-3.1.6/lib/mongoid/config/validators/session.rb:25:in `block in validate'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/mongoid-3.1.6/lib/mongoid/config/validators/session.rb:24:in `each_pair'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/mongoid-3.1.6/lib/mongoid/config/validators/session.rb:24:in `validate'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/mongoid-3.1.6/lib/mongoid/config.rb:239:in `sessions='
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/mongoid-3.1.6/lib/mongoid/config.rb:136:in `load_configuration'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/mongoid-3.1.6/lib/mongoid/config.rb:93:in `load!'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/mongoid-3.1.6/lib/mongoid.rb:163:in `load!'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/mongoid-3.1.6/lib/mongoid/railtie.rb:67:in `block in <class:Railtie>'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.15/lib/rails/initializable.rb:30:in `instance_exec'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.15/lib/rails/initializable.rb:30:in `run'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.15/lib/rails/initializable.rb:55:in `block in run_initializers'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.15/lib/rails/initializable.rb:54:in `each'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.15/lib/rails/initializable.rb:54:in `run_initializers'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.15/lib/rails/application.rb:136:in `initialize!'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.15/lib/rails/railtie/configurable.rb:30:in `method_missing'
    from /home/jesus/rails_projects/myapp/config/environment.rb:5:in `<top (required)>'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.15/lib/active_support/dependencies.rb:251:in `require'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.15/lib/active_support/dependencies.rb:251:in `block in require'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.15/lib/active_support/dependencies.rb:236:in `load_dependency'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.15/lib/active_support/dependencies.rb:251:in `require'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.15/lib/rails/application.rb:103:in `require_environment!'
    from /home/jesus/.rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.15/lib/rails/commands.rb:25:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

我一直在网上冲浪，但找不到任何东西。这是我一直在使用的主要配置文件：

config/mongoid.yml

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

config/initializers/mongo.rb

MongoMapper.connection = Mongo::Connection.new( 'localhost', 27017 )
MongoMapper.database = "myapp_#{Rails.env}"

if defined?(PhusionPassenger)
  PhusionPassenger.on_event(:starting_worker_process) do |forked|
    MongoMapper.connection.connect if forked
  end
end

宝石文件

source 'https://rubygems.org'

gem 'rails', '3.2.15'

# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'jquery-rails', '3.0.4'
  gem 'jquery-ui-rails', '~>4.1.0'
  gem 'coffee-rails', '~> 3.2.1'

  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  gem 'therubyracer'

  gem 'uglifier', '>= 1.0.3'
end

gem 'mongo', '1.9.2'
gem 'bson_ext', '1.9.2'

gem 'fancybox-rails', "~> 0.2.1" 

gem 'mongo_mapper'
gem 'mongoid', '~> 3.1.6'

gem 'haml', "~> 4.0.4"

gem 'i18n', '~> 0.6.9'
gem 'i18n-js', '2.1.2'
gem 'mongo-i18n', '~> 0.0.3'

gem 'underscore-rails', '~> 1.5.2'

gem 'devise', '~> 3.2.2'

gem 'less-rails', '~> 2.4.2'
gem 'twitter-bootstrap-rails', '~> 2.2.8'

gem 'mongoid-paperclip', '~> 0.0.8'

group :test, :development do
  gem "rspec-rails", "~> 2.14.1"
  gem "mongoid-rspec", "~> 1.11.0"
end

group :test do
  gem 'database_cleaner'
end

当我尝试初始化服务器（rails s）或使用控制台（rails c）时，我得到了同样的错误。我花了很多时间试图找到原因，但我找不到任何东西。

提前致谢。

PD：如果您需要更多配置文件、模型、spec_helper...

，请告诉我

Answer 1

您的 27017 端口似乎没有运行 MongoDB。

这样做来启动它：

$ mongod