Question

我在跟随Michael Hartl的 Rails教程时遇到了意外错误。一帆风顺。

我第一次看到我得到了一个不同的＆＃34;动作控制器：异常被捕获＆＃34;完成Hartl's Listing 7.3后的错误比教程错误。

具体来说，当试图达到/ users / 1时，我得到：

UsersController＃show中的NoMethodError

未定义的方法`密钥？＆＃39;为零：NilClass

我继续阅读清单7.5 - 为用户的show动作添加一个视图，然后将show动作添加到Users控制器 - 这解决了Hartl得到的错误，但这些步骤并没有解决我的错误。

根据this question，我已经确认我的app / models / user.rb没有拼写错误：在搜索拼写错误后，我复制了＆amp;将Hartl的代码粘贴到我的文件中以便进行测量。

非常感谢任何关于在何处寻找拼写错误/问题的指导。

编辑1：根据要求，UsersController #show方法：

def show
  @user = User.find(params[:id])
end

编辑2：完整跟踪：

actionpack（3.2.8）lib / action_controller / metal / hide_actions.rb：36：在`visible_action？＆＃39;

actionpack（3.2.8）lib / action_controller / metal / hide_actions.rb：18：在`method_for_action＆＃39;

actionpack（3.2.8）lib / action_controller / metal / implicit_render.rb：14：在`method_for_action＆＃39;

actionpack（3.2.8）lib / action_controller / metal / compatibility.rb：61：在`method_for_action＆＃39;

actionpack（3.2.8）lib / abstract_controller / base.rb：115：在`process＆＃39;

actionpack（3.2.8）lib / abstract_controller / rendering.rb：45：在`process＆＃39;

actionpack（3.2.8）lib / action_controller / metal.rb：203：在`dispatch＆＃39;

actionpack（3.2.8）lib / action_controller / metal / rack_delegation.rb：14：在`dispatch＆＃39;

actionpack（3.2.8）lib / action_controller / metal.rb：246：在`block in action＆＃39;

actionpack（3.2.8）lib / action_dispatch / routing / route_set.rb：73：在`call＆＃39;

actionpack（3.2.8）lib / action_dispatch / routing / route_set.rb：73：在`dispatch＆＃39;

actionpack（3.2.8）lib / action_dispatch / routing / route_set.rb：36：在`call＆＃39;

旅程（1.0.4）lib / journey / router.rb：68：在`阻止通话＆＃39;

旅程（1.0.4）lib / journey / router.rb：56：在每个＆＃39;

旅程（1.0.4）lib / journey / router.rb：56：在`call＆＃39;

actionpack（3.2.8）lib / action_dispatch / routing / route_set.rb：600：在`call＆＃39;

actionpack（3.2.8）lib / action_dispatch / middleware / best_standards_support.rb：17：在`call＆＃39;

rack（1.4.1）lib / rack / etag.rb:23：在`call＆＃39;

rack（1.4.1）lib / rack / conditionalget.rb：25：在`call＆＃39;

actionpack（3.2.8）lib / action_dispatch / middleware / head.rb：14：在`call＆＃39;

actionpack（3.2.8）lib / action_dispatch / middleware / params_parser.rb：21：在`call＆＃39;

actionpack（3.2.8）lib / action_dispatch / middleware / flash.rb：242：在`call＆＃39;

rack（1.4.1）lib / rack / session / abstract / id.rb:205：在`context＆＃39;

rack（1.4.1）lib / rack / session / abstract / id.rb：200：在`call＆＃39;

actionpack（3.2.8）lib / action_dispatch / middleware / cookies.rb：339：在`call＆＃39;

activerecord（3.2.8）lib / active_record / query_cache.rb:64：在`call＆＃39;

activerecord（3.2.8）lib / active_record / connection_adapters / abstract / connection_pool.rb：473：在`call＆＃39;

actionpack（3.2.8）lib / action_dispatch / middleware / callbacks.rb：28：in block in call＆＃39;

activesupport（3.2.8）lib / active_support / callbacks.rb:405：在`_run__3560654018285941260__call__3098371293035639072__callbacks＆＃39;

activesupport（3.2.8）lib / active_support / callbacks.rb:405：在`__run_callback＆＃39;

activesupport（3.2.8）lib / active_support / callbacks.rb：385：在`_run_call_callbacks＆＃39;

activesupport（3.2.8）lib / active_support / callbacks.rb：81：在`run_callbacks＆＃39;

actionpack（3.2.8）lib / action_dispatch / middleware / callbacks.rb：27：在`call＆＃39;

actionpack（3.2.8）lib / action_dispatch / middleware / reloader.rb：65：在`call＆＃39;

actionpack（3.2.8）lib / action_dispatch / middleware / remote_ip.rb：31：在`call＆＃39;

actionpack（3.2.8）lib / action_dispatch / middleware / debug_exceptions.rb：16：在`call＆＃39;

actionpack（3.2.8）lib / action_dispatch / middleware / show_exceptions.rb：56：在`call＆＃39;

railties（3.2.8）lib / rails / rack / logger.rb：26：在`call_app＆＃39;

railties（3.2.8）lib / rails / rack / logger.rb：16：在`call＆＃39;

actionpack（3.2.8）lib / action_dispatch / middleware / request_id.rb：22：在`call＆＃39;

rack（1.4.1）lib / rack / methodoverride.rb：21：在`call＆＃39;

rack（1.4.1）lib / rack / runtime.rb：17：在`call＆＃39;

activesupport（3.2.8）lib / active_support / cache / strategy / local_cache.rb：72：在`call＆＃39;

rack（1.4.1）lib / rack / lock.rb:15：在`call＆＃39;

actionpack（3.2.8）lib / action_dispatch / middleware / static.rb：62：在`call＆＃39;

railties（3.2.8）lib / rails / engine.rb：479：在`call＆＃39;

railties（3.2.8）lib / rails / application.rb:223：在`call＆＃39;

rack（1.4.1）lib / rack / content_length.rb：14：在`call＆＃39;

railties（3.2.8）lib / rails / rack / log_tailer.rb：17：在`call＆＃39;

rack（1.4.1）lib / rack / handler / webrick.rb：59：在`service＆＃39;

/Users/aaronmacy/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httpserver.rb:138:in`service'

/Users/aaronmacy/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httpserver.rb:94:in“run＆＃39;

/Users/aaronmacy/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/server.rb:191:in,clock in start_thread＆＃39;

编辑3： users_controller.rb：

class UsersController < ApplicationController

  def show
    @user = User.find(params[:id])
  end

  def new
  end
end

user.rb：

class User < ActiveRecord::Base
  attr_accessible :name, :email, :password, :password_confirmation
  has_secure_password

  before_save { self.email.downcase! }

  validates :name, presence: true, length: { maximum: 50 }
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
  validates :email, presence:   true,
                    format:     { with: VALID_EMAIL_REGEX },
                    uniqueness: { case_sensitive: false }
  validates :password, presence: true, length: { minimum: 6 }
  validates :password_confirmation, presence: true
end

routes.rb中：

SampleApp::Application.routes.draw do
  resources :users

  root to: 'static_pages#home'

  match '/signup',  to: 'users#new'

  match '/help',    to: 'static_pages#help'
  match '/about',   to: 'static_pages#about'
  match '/contact', to: 'static_pages#contact'
end

Answer 1

这是一个bcrypt问题。验证您的Gemfile中是否有未注释的bcrypt，运行bundle install，然后重新启动服务器。

请参阅：undefined method `key?' for nil:NilClass with bcrypt-ruby and has_secure_password

UsersController中的NoMethodError #show / undefined方法`key？'为零：NilClass

1 个答案: