Ruby on rails '；Mongo:：操作失败'；对于Rails中的某些操作

我是刚到Mongo的。我已经从源代码安装了Mongodb。我正在使用mongodb for Rails应用程序。启动mongodb和rails后，应用程序可以正常加载。但是，当我尝试登录时失败。当我尝试在rails控制台中执行一些操作时，也会发生同样的情况

以下是型号代码：

  def self.authenticate(email, password)
    user = find(:first, :conditions => {:email => email})
    if user && user.password_hash == BCrypt::Engine.hash_secret(password, user.password_salt)
      user
    else
     nil
    end
  end

如果user&&user.password\u hash==BCrypt:：Engine.hash\u secret（password，user.password\u salt）

以下是简短的错误：

数据库命令“create”失败：{“ok”=>0.0，“errmsg”=>“集合已存在”，“code”=>48}

以及完整的应用程序错误跟踪：

mongo（1.3.1）lib/mongo/db.rb:506:in

command'
mongo（1.3.1）lib/mongo/db.rb:284:in

create_collection' mongoid（2.2.1）lib/mongoid/collections/master.rb:41:in

initialize'
mongoid（2.2.1）lib/mongoid/collection.rb:127:in

new' mongoid（2.2.1）lib/mongoid/collection.rb:127:in

master'
mongoid（2.2.1）lib/mongoid/collection.rb:60:in

find_one' mongoid（2.2.1）lib/mongoid/contexts/mongo.rb:164:in

first'
mongoid（2.2.1）lib/mongoid/criteria.rb:42:in

one' mongoid（2.2.1）lib/mongoid/criteria/inclusion.rb:104:in

find'
mongoid（2.2.1）lib/mongoid/finders.rb:83:in

find' actionpack（3.0.3）lib/action\u controller/metal/implicit\u render.rb:4:in

send\u action'
actionpack（3.0.3）lib/abstract\u controller/base.rb:151:in

process\u action' actionpack（3.0.3）lib/action\u controller/metal/rendering.rb:11:in

process\u action'
actionpack（3.0.3）lib/abstract\u controller/callbacks.rb:18:in

block in process\u action' activesupport（3.0.3）lib/active\u support/callbacks.rb:435:in

\u run\u 902337259577170033\u进程\u操作\u 4476240526817474042\u回调'
activesupport（3.0.3）lib/active\u support/callbacks.rb:409:in

\u run\u process\u action\u callbacks' activesupport（3.0.3）lib/active\u support/callbacks.rb:93:in

run\u callbacks'
actionpack（3.0.3）lib/abstract\u controller/callbacks.rb:17:in

process\u action' actionpack（3.0.3）lib/action\u controller/metal/instrumentation.rb:30:in

block in process\u action'
activesupport（3.0.3）lib/active_support/notifications.rb:52:in

仪表中的块' activesupport（3.0.3）lib/active_support/notifications/instrumenter.rb:21:in

instrument'
activesupport（3.0.3）lib/active\u support/notifications.rb:52:in

instrument' actionpack（3.0.3）lib/action\u controller/metal/instrumentation.rb:29:in

process\u action'
actionpack（3.0.3）lib/action\u controller/metal/rescue.rb:17:in

process\u action' actionpack（3.0.3）lib/abstract_controller/base.rb:120:in

process'
actionpack（3.0.3）lib/abstract_controller/rendering.rb:40:in

process' actionpack（3.0.3）lib/action_controller/metal.rb:138:in

dispatch'
actionpack（3.0.3）lib/action\u controller/metal/rack\u delegation.rb:14:in

dispatch' actionpack（3.0.3）lib/action_controller/metal.rb:178:in

block in action'
actionpack（3.0.3）lib/action\u dispatch/routing/route\u set.rb:62:in

call' actionpack（3.0.3）lib/action_dispatch/routing/route_set.rb:62:in

dispatch'
actionpack（3.0.3）lib/action\u dispatch/routing/route\u set.rb:27:in

call' 机架安装（0.6.14）lib/rack/mount/route_set.rb:148:in

block in call'
机架安装（0.6.14）lib/rack/mount/code_generation.rb:93:in

块中识别' 机架安装（0.6.14）lib/rack/mount/code_generation.rb:75:in

optimized_各'
机架安装（0.6.14）lib/rack/mount/code_generation.rb:92:in

recognize' 机架安装（0.6.14）lib/rack/mount/route_set.rb:139:in

call'
actionpack（3.0.3）lib/action\u dispatch/routing/route\u set.rb:492:in

call' mongoid（2.2.1）lib/rack/mongoid/middleware/identity_map.rb:33:in

block in call'
mongoid（2.2.1）lib/mongoid.rb:130:in

unit of_work' mongoid（2.2.1）lib/rack/mongoid/middleware/identity_map.rb:33:in

call'
actionpack（3.0.3）lib/action\u dispatch/middleware/best\u standards\u support.rb:17:in

call' actionpack（3.0.3）lib/action\u dispatch/middleware/head.rb:14:in

call'
机架（1.2.4）lib/rack/methodoverride.rb:24:in

call' actionpack（3.0.3）lib/action_dispatch/middleware/params_parser.rb:21:in

call'
actionpack（3.0.3）lib/action_dispatch/middleware/flash.rb:182:in

call' actionpack（3.0.3）lib/action\u dispatch/middleware/session/abstract\u store.rb:149:in

call'
actionpack（3.0.3）lib/action_dispatch/middleware/cookies.rb:295:in

call' actionpack（3.0.3）lib/action_dispatch/middleware/callbacks.rb:46:in

block in call'
activesupport（3.0.3）lib/active\u support/callbacks.rb:415:in

\u run\u call\u callbacks' actionpack（3.0.3）lib/action\u dispatch/middleware/callbacks.rb:44:in

call'
机架（1.2.4）lib/rack/sendfile.rb:106:in

call' actionpack（3.0.3）lib/action\u dispatch/middleware/remote\u ip.rb:48:in

call'
actionpack（3.0.3）lib/action\u dispatch/middleware/show\u exceptions.rb:46:in

call' railties（3.0.3）lib/rails/rack/logger.rb:13:in

call'
机架（1.2.4）lib/rack/runtime.rb:17:in

call' activesupport（3.0.3）lib/active\u support/cache/strategy/local\u cache.rb:72:in

call'
机架（1.2.4）lib/rack/lock.rb:11:in

block in call' 机架（1.2.4）lib/rack/lock.rb:11:in

synchronize'
机架（1.2.4）lib/rack/lock.rb:11:in

call' actionpack（3.0.3）lib/action\u dispatch/middleware/static.rb:30:in

call'
railties（3.0.3）lib/rails/application.rb:168:in

call' railties（3.0.3）lib/rails/application.rb:77:in

method_missing'
railties（3.0.3）lib/rails/rack/log_tailer.rb:14:in

call' 机架（1.2.4）lib/rack/content_length.rb:13:in

call'
机架（1.2.4）lib/rack/handler/webrick.rb:52:in

service' /Users/reonios/.rvm/rubies/ruby-2.1.7/lib/ruby/2.1.0/webrick/httpserver.rb:138:in

service'
/Users/reonios/.rvm/rubies/ruby-2。
{  
   "utf8"=>"✓",
   "authenticity_token"=>"cAcdDOzfBgalF5em+97mTKw9DAjymfmEmG6hc+dDqhQ=",
   "email"=>"super_admin_user@test.com",
   "password"=>"[FILTERED]",
   "commit"=>"Login"
}