ruby-on-rails - 在生产中使用 Rails 3.1 时 Stange 随机崩溃-6ren

ruby-on-rails - 在生产中使用 Rails 3.1 时 Stange 随机崩溃

转载作者：行者123 更新时间：2023-12-04 01:37:07

我看到我的全新 Rails 3.1 rc5 应用程序在生产模式下运行时出现了一些奇怪的随机崩溃。后端是具有 3 个瘦实例的 nginx。

[Exception] users#show (NoMethodError) "undefined method `text?' for nil:NilClass"

 undefined method `text?' for nil:NilClass
 activerecord (3.1.0.rc5) lib/active_record/validations/uniqueness.rb:57:in `build_relation'

我打开了日志:调试。但是，唯一的信息是“内部服务器错误” 以前有人见过吗？身份 map 被翻...

如果我重新启动瘦，Rails 将运行几个小时没有问题。

更新 1:看起来几乎是我所有的 Controller 操作都会随机生成此错误。今天早上我收到了一封包含上述错误的电子邮件。如果我点击链接，页面生成没有问题。

我想知道这个问题是否与从 cookie 加载用户的问题有关？

class ApplicationController < ActionController::Base
  protect_from_forgery
  layout "content_with_sidebar"
  before_filter :system

  rescue_from CanCan::AccessDenied do |exception|
    flash[:warning] = "Ingen adgang!"
    redirect_to root_url
  end  

  def system
    if current_user
      unless current_user.email_verified == "t"
        flash[:warning] = 'Please activate your account.'
      end
      current_user.last_seen = Time.now
      current_user.save # <--- line 18
      @new_messages = Message.new_messages(current_user).count
    end
  end

  helper_method :current_user

  private

  def current_user
    if cookies[:auth_token]
      @current_user ||= User.find_by_auth_token!(cookies[:auth_token]) 
    end
  end   
end

来自用户的代码示例#Show

class UsersController < ApplicationController
  before_filter :ensure_current_user_url, :only => :show
  load_and_authorize_resource

  def ensure_current_user_url
    @user = User.find(params[:id].downcase)
    redirect_to @user, :status => :moved_permanently unless @user.friendly_id_status.best?
  end  

  def show
    if params[:do] == "guestbook"
      @comment = @user.comments.new
      @comments = @user.comments.includes(:author).order("created_at DESC").all(:limit => 5)
    else
      @recent_comments = @user.comments(:order => "created_at DESC")
    end
    @arts = @user.arts.order("created_at desc").includes([:author, :category]).page(params[:page]).per(24)
    render :layout => "content_with_sidebar_whitebox"
  end

更新 2
这是我通过添加调试获得的信息。

************** username
************** ["id", "username", "email", "email_verified", "birthday", "firstname", "lastname", "phone", "website", "profile", "last_seen", "administrator", "cached_slug", "password_salt", "crypted_password", "avatar", "avatar_cache", "comments_count", "arts_count", "auth_token", "account_activation_token", "account_activation_sent_at", "password_reset_token", "password_reset_sent_at", "created_at", "updated_at", "cheapest", "most_expensive"]
************** email
************** ["id", "username", "email", "email_verified", "birthday", "firstname", "lastname", "phone", "website", "profile", "last_seen", "administrator", "cached_slug", "password_salt", "crypted_password", "avatar", "avatar_cache", "comments_count", "arts_count", "auth_token", "account_activation_token", "account_activation_sent_at", "password_reset_token", "password_reset_sent_at", "created_at", "updated_at", "cheapest", "most_expensive"]

这是今天早上崩溃的完整堆栈跟踪。

Started GET "/messages" for filtered-ip at 2011-08-15 12:13:17 -0400


Processing by MessagesController#index as HTML
  User Load (1.5ms)  SELECT "users".* FROM "users" WHERE "users"."auth_token" = '380e8b776cb8e3c5fd7d8b777b6d2073' ORDER BY last_seen desc LIMIT 1
   (0.3ms)  BEGIN
   (0.9ms)  SELECT 1 FROM "users" WHERE ("users"."username" = 'samia-dk' AND "users"."id" != 483) LIMIT 1
   (0.9ms)  SELECT 1 FROM "users" WHERE ("users"."email" = 'mail@filtered.dk' AND "users"."id" != 483) LIMIT 1
   (0.4ms)  ROLLBACK
Completed 500 Internal Server Error in 14ms
Rendered /usr/local/rvm/gems/ruby-1.9.2-p290-dev@myblog5/gems/exception_notification_rails3-1.2.0/lib/exception_notifier/views/exception_notifier/_request.text.erb (0.8ms)
Rendered /usr/local/rvm/gems/ruby-1.9.2-p290-dev@myblog5/gems/exception_notification_rails3-1.2.0/lib/exception_notifier/views/exception_notifier/_title.text.erb (0.4ms)
Rendered /usr/local/rvm/gems/ruby-1.9.2-p290-dev@myblog5/gems/exception_notification_rails3-1.2.0/lib/exception_notifier/views/exception_notifier/_session.text.erb (0.9ms)
Rendered /usr/local/rvm/gems/ruby-1.9.2-p290-dev@myblog5/gems/exception_notification_rails3-1.2.0/lib/exception_notifier/views/exception_notifier/_title.text.erb (0.1ms)
Rendered /usr/local/rvm/gems/ruby-1.9.2-p290-dev@myblog5/gems/exception_notification_rails3-1.2.0/lib/exception_notifier/views/exception_notifier/_environment.text.erb (55.3ms)
Rendered /usr/local/rvm/gems/ruby-1.9.2-p290-dev@myblog5/gems/exception_notification_rails3-1.2.0/lib/exception_notifier/views/exception_notifier/_title.text.erb (0.3ms)
Rendered /usr/local/rvm/gems/ruby-1.9.2-p290-dev@myblog5/gems/exception_notification_rails3-1.2.0/lib/exception_notifier/views/exception_notifier/_backtrace.text.erb (1.7ms)
Rendered /usr/local/rvm/gems/ruby-1.9.2-p290-dev@myblog5/gems/exception_notification_rails3-1.2.0/lib/exception_notifier/views/exception_notifier/_title.text.erb (0.2ms)
Rendered /usr/local/rvm/gems/ruby-1.9.2-p290-dev@myblog5/gems/exception_notification_rails3-1.2.0/lib/exception_notifier/views/exception_notifier/exception_notification.text.erb (71.8ms)

Sent mail to some@mail.com (3072ms)
Date: Mon, 15 Aug 2011 12:13:18 -0400
From: Exception Notifier <robot@myblog.dk>
To: some@mail.com
Message-ID: <4e49459e3709a_792610c8826e4@li267-196.mail>
Subject: [Exception] messages#index (NoMethodError) "undefined method `text?'
 for nil:NilClass"
Mime-Version: 1.0
Content-Type: text/plain;
 charset=UTF-8
Content-Transfer-Encoding: 7bit

A NoMethodError occurred in messages#index:

  undefined method `text?' for nil:NilClass
  config/initializers/some_debug.rb:6:in `build_relation'

-------------------------------
Request:
-------------------------------

  * URL       : http://www.myblog.dk/messages
  * IP address: filtered
  * Parameters: {"action"=>"index", "controller"=>"messages"}
  * Rails root: /home/atmorell/Dropbox/myblog5

-------------------------------
Session:
-------------------------------

  * session id: nil
  * data: {"_csrf_token"=>"filtered=",
   "user_credentials"=>true,
   "user_credentials_id"=>483}

-------------------------------
Environment:
-------------------------------

  * GATEWAY_INTERFACE                         : CGI/1.2
  * HTTP_ACCEPT                               : text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
  * HTTP_ACCEPT_CHARSET                       : ISO-8859-1,utf-8;q=0.7,*;q=0.7
  * HTTP_ACCEPT_ENCODING                      : gzip, deflate
  * HTTP_ACCEPT_LANGUAGE                      : en,da;q=0.7,en-us;q=0.3
  * HTTP_CONNECTION                           : close
  * HTTP_COOKIE                               : __utma=52641074.268317442.1313423882.1313423882.1313423882.1; __utmb=52641074.53.10.1313423882; __utmc=52641074; __utmz=52641074.1313423882.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); _myblog_session5=ed471364634fcd3b44c7bb0eae758b14; user_credentials=true%3A%3A483; auth_token=filtered
  * HTTP_HOST                                 : www.myblog.dk
  * HTTP_REFERER                              : http://www.myblog.dk/messages/new
  * HTTP_USER_AGENT                           : Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0
  * HTTP_VERSION                              : HTTP/1.0
  * PATH_INFO                                 : /messages
  * QUERY_STRING                              : 
  * REMOTE_ADDR                               : filtered-ip
  * REQUEST_METHOD                            : GET
  * REQUEST_PATH                              : /messages
  * REQUEST_URI                               : /messages
  * SCRIPT_NAME                               : 
  * SERVER_NAME                               : www.myblog.dk
  * SERVER_PORT                               : 80
  * SERVER_PROTOCOL                           : HTTP/1.1
  * SERVER_SOFTWARE                           : thin 1.2.11 codename Bat-Shit Crazy
  * action_controller.instance                : messages#index
  * action_dispatch.cookies                   : #<ActionDispatch::Cookies::CookieJar:0x00000008766b98>
  * action_dispatch.parameter_filter          : [:password, /RAW_POST_DATA/]
  * action_dispatch.remote_ip                 : filtered-ip
  * action_dispatch.request.content_type      : 
  * action_dispatch.request.formats           : [text/html]
  * action_dispatch.request.parameters        : {"action"=>"index", "controller"=>"messages"}
  * action_dispatch.request.path_parameters   : {:action=>"index", :controller=>"messages"}
  * action_dispatch.request.query_parameters  : {}
  * action_dispatch.request.request_parameters: {}
  * action_dispatch.routes                    : #<ActionDispatch::Routing::RouteSet:0x00000002eaf658>
  * action_dispatch.secret_token              : 93479c2e63bdb766a51f18397345cdc9a8b22ee009334171207f6b0bc2e71105d1f849de46e34965febc3b178cea662e89986e73d8922ec4915c44dca6ae4000
  * action_dispatch.show_exceptions           : true
  * async.callback                            : #<Method: Thin::Connection#post_process>
  * async.close                               : #<EventMachine::DefaultDeferrable:0x000000087809a8>
  * exception_notifier.options                : {:email_prefix=>"[Exception] ", :sender_address=>"\"Exception Notifier\" <robot@myblog.dk>", :exception_recipients=>["some@mail.com"], :ignore_exceptions=>[ActiveRecord::RecordNotFound, AbstractController::ActionNotFound, ActionController::RoutingError]}
  * rack-cache.allow_reload                   : false
  * rack-cache.allow_revalidate               : false
  * rack-cache.cache_key                      : Rack::Cache::Key
  * rack-cache.default_ttl                    : 0
  * rack-cache.entitystore                    : rails:/
  * rack-cache.metastore                      : rails:/
  * rack-cache.private_headers                : ["Authorization", "Cookie"]
  * rack-cache.storage                        : #<Rack::Cache::Storage:0x000000029e9b50>
  * rack-cache.verbose                        : true
  * rack.errors                               : #<IO:0x00000000c27860>
  * rack.input                                : #<StringIO:0x00000008784c10>
  * rack.multiprocess                         : false
  * rack.multithread                          : false
  * rack.request.cookie_hash                  : {"__utma"=>"52641074.268317442.1313423882.1313423882.1313423882.1", "__utmb"=>"52641074.53.10.1313423882", "__utmc"=>"52641074", "__utmz"=>"52641074.1313423882.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)", "_myblog_session5"=>"ed471364634fcd3b44c7bb0eae758b14", "user_credentials"=>"true::483", "auth_token"=>"filtered"}
  * rack.request.cookie_string                : __utma=52641074.268317442.1313423882.1313423882.1313423882.1; __utmb=52641074.53.10.1313423882; __utmc=52641074; __utmz=52641074.1313423882.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); _myblog_session5=ed471364634fcd3b44c7bb0eae758b14; user_credentials=true%3A%3A483; auth_token=filtered
  * rack.request.query_hash                   : {}
  * rack.request.query_string                 : 
  * rack.run_once                             : false
  * rack.session                              : {"_csrf_token"=>"jlK/filtered=", "user_credentials"=>true, "user_credentials_id"=>483}
  * rack.session.options                      : {:key=>"_myblog_session5", :path=>"/", :domain=>nil, :expire_after=>nil, :secure=>false, :httponly=>true, :defer=>false, :renew=>false, :id=>"ed471364634fcd3b44c7bb0eae758b14"}
  * rack.session.record                       : #<ActiveRecord::SessionStore::Session:0x000000087762f0>
  * rack.url_scheme                           : http
  * rack.version                              : [1, 0]

  * Process: 1938
  * Server : li267-196

-------------------------------
Backtrace:
-------------------------------

  config/initializers/some_debug.rb:6:in `build_relation'
  activerecord (3.1.0.rc5) lib/active_record/validations/uniqueness.rb:25:in `validate_each'
  activemodel (3.1.0.rc5) lib/active_model/validator.rb:153:in `block in validate'
  activemodel (3.1.0.rc5) lib/active_model/validator.rb:150:in `each'
  activemodel (3.1.0.rc5) lib/active_model/validator.rb:150:in `validate'
  activesupport (3.1.0.rc5) lib/active_support/callbacks.rb:302:in `_callback_before_483'
  activesupport (3.1.0.rc5) lib/active_support/callbacks.rb:622:in `_run_validate_callbacks'
  activesupport (3.1.0.rc5) lib/active_support/callbacks.rb:81:in `run_callbacks'
  activemodel (3.1.0.rc5) lib/active_model/validations.rb:212:in `run_validations!'
  activemodel (3.1.0.rc5) lib/active_model/validations/callbacks.rb:53:in `block in run_validations!'
  activesupport (3.1.0.rc5) lib/active_support/callbacks.rb:401:in `_run_validation_callbacks'
  activesupport (3.1.0.rc5) lib/active_support/callbacks.rb:81:in `run_callbacks'
  activemodel (3.1.0.rc5) lib/active_model/validations/callbacks.rb:53:in `run_validations!'
  activemodel (3.1.0.rc5) lib/active_model/validations.rb:179:in `valid?'
  activerecord (3.1.0.rc5) lib/active_record/validations.rb:69:in `valid?'
  activerecord (3.1.0.rc5) lib/active_record/validations.rb:77:in `perform_validations'
  activerecord (3.1.0.rc5) lib/active_record/validations.rb:50:in `save'
  activerecord (3.1.0.rc5) lib/active_record/attribute_methods/dirty.rb:22:in `save'
  activerecord (3.1.0.rc5) lib/active_record/transactions.rb:241:in `block (2 levels) in save'
  activerecord (3.1.0.rc5) lib/active_record/transactions.rb:295:in `block in with_transaction_returning_status'
  activerecord (3.1.0.rc5) lib/active_record/connection_adapters/abstract/database_statements.rb:183:in `transaction'
  activerecord (3.1.0.rc5) lib/active_record/transactions.rb:208:in `transaction'
  activerecord (3.1.0.rc5) lib/active_record/transactions.rb:293:in `with_transaction_returning_status'
  activerecord (3.1.0.rc5) lib/active_record/transactions.rb:241:in `block in save'
  activerecord (3.1.0.rc5) lib/active_record/transactions.rb:252:in `rollback_active_record_state!'
  activerecord (3.1.0.rc5) lib/active_record/transactions.rb:240:in `save'
  app/controllers/application_controller.rb:18:in `system'
  activesupport (3.1.0.rc5) lib/active_support/callbacks.rb:430:in `_run__163591495713425608__process_action__3187008165500041637__callbacks'
  activesupport (3.1.0.rc5) lib/active_support/callbacks.rb:386:in `_run_process_action_callbacks'
  activesupport (3.1.0.rc5) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (3.1.0.rc5) lib/abstract_controller/callbacks.rb:17:in `process_action'
  actionpack (3.1.0.rc5) lib/action_controller/metal/rescue.rb:17:in `process_action'
  actionpack (3.1.0.rc5) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
  activesupport (3.1.0.rc5) lib/active_support/notifications.rb:55:in `block in instrument'
  activesupport (3.1.0.rc5) lib/active_support/notifications/instrumenter.rb:21:in `instrument'
  activesupport (3.1.0.rc5) lib/active_support/notifications.rb:55:in `instrument'
  actionpack (3.1.0.rc5) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
  actionpack (3.1.0.rc5) lib/action_controller/metal/params_wrapper.rb:202:in `process_action'
  activerecord (3.1.0.rc5) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
  actionpack (3.1.0.rc5) lib/abstract_controller/base.rb:121:in `process'
  actionpack (3.1.0.rc5) lib/abstract_controller/rendering.rb:45:in `process'
  actionpack (3.1.0.rc5) lib/action_controller/metal.rb:193:in `dispatch'
  actionpack (3.1.0.rc5) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
  actionpack (3.1.0.rc5) lib/action_controller/metal.rb:236:in `block in action'
  actionpack (3.1.0.rc5) lib/action_dispatch/routing/route_set.rb:65:in `call'
  actionpack (3.1.0.rc5) lib/action_dispatch/routing/route_set.rb:65:in `dispatch'
  actionpack (3.1.0.rc5) lib/action_dispatch/routing/route_set.rb:29:in `call'
  rack-mount (0.8.2) lib/rack/mount/route_set.rb:152:in `block in call'
  rack-mount (0.8.2) lib/rack/mount/code_generation.rb:96:in `block in recognize'
  rack-mount (0.8.2) lib/rack/mount/code_generation.rb:68:in `optimized_each'
  rack-mount (0.8.2) lib/rack/mount/code_generation.rb:95:in `recognize'
  rack-mount (0.8.2) lib/rack/mount/route_set.rb:141:in `call'
  actionpack (3.1.0.rc5) lib/action_dispatch/routing/route_set.rb:531:in `call'
  oa-core (0.2.6) lib/omniauth/strategy.rb:44:in `call!'
  oa-core (0.2.6) lib/omniauth/strategy.rb:30:in `call'
  oa-core (0.2.6) lib/omniauth/strategy.rb:44:in `call!'
  oa-core (0.2.6) lib/omniauth/strategy.rb:30:in `call'
  oa-core (0.2.6) lib/omniauth/strategy.rb:44:in `call!'
  oa-core (0.2.6) lib/omniauth/strategy.rb:30:in `call'
  oa-core (0.2.6) lib/omniauth/builder.rb:30:in `call'
  exception_notification_rails3 (1.2.0) lib/exception_notifier.rb:34:in `call'
  actionpack (3.1.0.rc5) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
  rack (1.3.2) lib/rack/etag.rb:23:in `call'
  rack (1.3.2) lib/rack/conditionalget.rb:25:in `call'
  actionpack (3.1.0.rc5) lib/action_dispatch/middleware/head.rb:14:in `call'
  actionpack (3.1.0.rc5) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
  actionpack (3.1.0.rc5) lib/action_dispatch/middleware/flash.rb:243:in `call'
  rack (1.3.2) lib/rack/session/abstract/id.rb:195:in `context'
  rack (1.3.2) lib/rack/session/abstract/id.rb:190:in `call'
  actionpack (3.1.0.rc5) lib/action_dispatch/middleware/cookies.rb:326:in `call'
  activerecord (3.1.0.rc5) lib/active_record/query_cache.rb:62:in `call'
  activerecord (3.1.0.rc5) lib/active_record/connection_adapters/abstract/connection_pool.rb:466:in `call'
  actionpack (3.1.0.rc5) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
  activesupport (3.1.0.rc5) lib/active_support/callbacks.rb:392:in `_run_call_callbacks'
  activesupport (3.1.0.rc5) lib/active_support/callbacks.rb:81:in `run_callbacks'
  actionpack (3.1.0.rc5) lib/action_dispatch/middleware/callbacks.rb:28:in `call'
  rack (1.3.2) lib/rack/sendfile.rb:101:in `call'
  actionpack (3.1.0.rc5) lib/action_dispatch/middleware/remote_ip.rb:48:in `call'
  actionpack (3.1.0.rc5) lib/action_dispatch/middleware/show_exceptions.rb:47:in `call'
  railties (3.1.0.rc5) lib/rails/rack/logger.rb:13:in `call'
  rack (1.3.2) lib/rack/methodoverride.rb:24:in `call'
  rack (1.3.2) lib/rack/runtime.rb:17:in `call'
  activesupport (3.1.0.rc5) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
  rack (1.3.2) lib/rack/lock.rb:15:in `call'
  actionpack (3.1.0.rc5) lib/action_dispatch/middleware/static.rb:53:in `call'
  rack-cache (1.0.2) lib/rack/cache/context.rb:132:in `forward'
  rack-cache (1.0.2) lib/rack/cache/context.rb:243:in `fetch'
  rack-cache (1.0.2) lib/rack/cache/context.rb:181:in `lookup'
  rack-cache (1.0.2) lib/rack/cache/context.rb:65:in `call!'
  rack-cache (1.0.2) lib/rack/cache/context.rb:50:in `call'
  railties (3.1.0.rc5) lib/rails/engine.rb:455:in `call'
  railties (3.1.0.rc5) lib/rails/railtie/configurable.rb:30:in `method_missing'
  thin (1.2.11) lib/thin/connection.rb:84:in `block in pre_process'
  thin (1.2.11) lib/thin/connection.rb:82:in `catch'
  thin (1.2.11) lib/thin/connection.rb:82:in `pre_process'
  thin (1.2.11) lib/thin/connection.rb:57:in `process'
  thin (1.2.11) lib/thin/connection.rb:42:in `receive_data'
  eventmachine (0.12.10) lib/eventmachine.rb:256:in `run_machine'
  eventmachine (0.12.10) lib/eventmachine.rb:256:in `run'
  thin (1.2.11) lib/thin/backends/base.rb:61:in `start'
  thin (1.2.11) lib/thin/server.rb:159:in `start'
  thin (1.2.11) lib/thin/controllers/controller.rb:86:in `start'
  thin (1.2.11) lib/thin/runner.rb:185:in `run_command'
  thin (1.2.11) lib/thin/runner.rb:151:in `run!'
  thin (1.2.11) bin/thin:6:in `<top (required)>'
  /usr/local/rvm/gems/ruby-1.9.2-p290-dev@myblog5/bin/thin:19:in `load'
  /usr/local/rvm/gems/ruby-1.9.2-p290-dev@myblog5/bin/thin:19:in `<main>'



NoMethodError (undefined method `text?' for nil:NilClass):
  config/initializers/some_debug.rb:6:in `build_relation'
  app/controllers/application_controller.rb:18:in `system'

用户名

    # -*- encoding : utf-8 -*-
class User < ActiveRecord::Base
  attr_accessible :username, :email, :birthday, :firstname, :lastname, :phone, :website, :profile, :avatar, :password, :avatar_cache, :name, :last_seen, :arts_count, :cheapest, :most_expensive #, :email_verified, :crypted_password, :password_salt, :administrator, :id

  # Virtual attributes
  attr_accessor :password, :password_confirmation

  belongs_to :cheapest, :class_name => "Art", :foreign_key => :cheapest
  belongs_to :most_expensive, :class_name => "Art", :foreign_key => :most_expensive

  has_many :blogs, :dependent => :destroy
  has_many :arts, :dependent => :destroy
  has_many :authentications, :dependent => :destroy
  has_friendly_id :username, :use_slug => true 
  has_many :comments, :as => :commentable, :validate => :false

  mount_uploader :avatar, AvatarUploader  
  before_save :encrypt_password
  before_create { generate_token(:auth_token) }
  after_create { send_account_activation }

  validates_uniqueness_of :username, :email
  validates_presence_of :username, :email
  validate :password_length_without_authentications
  validates_format_of :username, :with => /^[-a-z\d_]+$/, :message => "kun små bogstaver, tal og bindestreger. f.eks. galleri-toke"
  validates_length_of :username, :maximum=>30, :message=>"Dit brugernavn må max være 30 karakter."
  validates_length_of :username, :minimum=>3, :message=>"Dit brugernavn skal minimum være 3 karakter."
  validates_format_of :email, :with => /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i

  default_scope :order => "last_seen desc" #, :conditions => "username NOT LIKE 'robot'"
  scope :with_arts, where("arts_count > 0")
...

每次用户刷新页面时，我都会更新 last_seen 列并保存 login_in 用户。由于某种原因，保存中断。我无法在我的开发服务器上重现这个。

最佳答案

解决方案:如果您的验证行说这...

validates :tag, :uniqueness => {:scope => :post}

...然后将其更改为引用列名而不是像这样的关联名称...

validates :tag_id, :uniqueness => {:scope => :post_id}

我在 rails 3.1.0.rc5 中重现了您的失败并产生了相同的错误消息。简短的解释是 build_relation 方法中的代码需要一个文字列名称，而不是关联名称。

如需更详尽的解释，包括代码片段，请参阅我的博客 http://thetenelements.blogspot.com/2011/08/undefined-method-text-for-nilnilclass.html

关于ruby-on-rails - 在生产中使用 Rails 3.1 时 Stange 随机崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6986367/

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ruby-on-rails - 在生产中使用 Rails 3.1 时 Stange 随机崩溃