Rails: NameError:未初始化的常量
Rails: NameError:未初始化的常量
提问于 2014-10-16 06:51:08
我有一个名为PhoneNumber的简单模型：
class PhoneNumber < ActiveRecord::Base
validates :pnumber, presence: true, on: :create #=> { :message => " cannot be blank" }
validates :pnumber, numericality: true, on: :create
end我转到应用程序的根文件夹(包含app子文件夹的根文件夹)并启动控制台：
rails console --sandbox当我尝试创建一个空的PhoneNumber时(我想得到一个错误消息，因为验证将失败)，我得到了以下错误消息：
2.0.0-p451 :001 > PhoneNumber.new
NameError: uninitialized constant PhoneNumber
from (irb):1
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/railties-4.1.5/lib/rails/commands/console.rb:90:in `start'
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/railties-4.1.5/lib/rails/commands/console.rb:9:in `start'
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/railties-4.1.5/lib/rails/commands/commands_tasks.rb:69:in `console'
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/railties-4.1.5/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/railties-4.1.5/lib/rails/commands.rb:17:in `<top (required)>'
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/railties-4.1.5/lib/rails/app_rails_loader.rb:43:in `require'
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/railties-4.1.5/lib/rails/app_rails_loader.rb:43:in `block in exec_app_rails'
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/railties-4.1.5/lib/rails/app_rails_loader.rb:32:in `loop'
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/railties-4.1.5/lib/rails/app_rails_loader.rb:32:in `exec_app_rails'
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/railties-4.1.5/lib/rails/cli.rb:5:in `<top (required)>'
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/railties-4.1.5/bin/rails:9:in `require'
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/railties-4.1.5/bin/rails:9:in `<top (required)>'
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/bin/rails:23:in `load'
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/bin/rails:23:in `<main>'
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/bin/ruby_executable_hooks:15:in `eval'
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/bin/2.2.2.02.02.02.0.2.2.02.222222.2.02.02.0.2.2.022222222222222看起来控制台并不知道这个模型。在普通的ruby中，您需要“请求”包含类的文件，但我认为rails控制台应该自动加载所有模型。这里发生什么事情？
回答 7
Stack Overflow用户
发布于 2015-04-18 14:19:32
我得到了一个错误：
NameError: uninitialized constant
然后，我注意到我意外地创建了一个复数模型，因此我返回并将模型文件重命名为singular，还将模型文件中的类名更改为singular，这解决了问题。
Stack Overflow用户
发布于 2018-05-30 06:55:13
在将Rails 5.1升级到5.2之后，我开始遇到这个问题
我用以下方法解决了这个问题：
spring stop
spring binstub --all
spring start
rails sStack Overflow用户
发布于 2016-09-30 07:59:29
我在models目录中直接找到了一个文件，结果发现我在启动时没有正确地加载代码。我可以通过在我的development.rb文件中设置config.eager_load = true来解决这个问题。这使得我可以在控制台中使用这个类
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/26393445
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