Ruby on rails 为什么我的应用程序/验证程序会出错？

我一直在尝试验证名字是否只包含字母、数字、连字符或下划线

在my users.rb模型中，我使用以下代码：

validates :first_namename, :firstname_convention => true

这将转到FirstNameConvention类：

class FirstnameConventionValidator < ActiveModel::EachValidator
  def validate_each(record, field, value)
    unless value.blank?
      record.errors[field] << "is not alphanumeric (letters, numbers,   underscores or periods)" unless value =~ /^[[:alnum:]._-]+$/
      record.errors[field] << "should start with a letter" unless value[0] =~ /[A-Za-z]/
      record.errors[field] << "contains illegal characters" unless    value.ascii_only?
    end
  end
end

我尝试过：

config.autoload_paths += %W["#{config.root}/app/validators"]

在config/application.rb中：

 require File.expand_path('../boot', __FILE__)

require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)
module ThorCinema
class Application < Rails::Application
# Settings in config/environments/* take precedence over those specified here.
# Application configuration should go into files in config/initializers
# -- all .rb files in that directory are automatically loaded.

# Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
# Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
# config.time_zone = 'Central Time (US & Canada)'

# The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
# config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
# config.i18n.default_locale = :de

# Do not swallow errors in after_commit/after_rollback callbacks.
config.active_record.raise_in_transactional_callbacks = true    
config.autoload_paths << Rails.root.join('app', 'validators')
end

end

需要文件。展开路径（'../boot'，文件）
需要“rails/all”
#需要Gemfile中列出的宝石，包括任何宝石
#您仅限于：测试、开发或：生产。
Bundler.require（*Rails.groups）
电影模块
类应用程序config.autoload_path
app/validators
是存储验证器的好地方，您所需要做的就是告诉Rails这个文件夹的存在。将此行添加到
config/application.rb
（
YourAppName:：application
部分）中的自动加载路径：

config.autoload_路径应用程序/验证程序可能不在通常的Rails路径中。试着把你的文件夹放到lib/validators中，看看这是否对你有效，所以把validators文件夹放在那里？是的。这是我的建议我应该在哪里创建lib文件夹？在默认站点目录中？lib文件夹应该已经存在（在应用程序的根目录中）！Rails将查看这个文件夹，如果它找不到类等。我已经更新了这个问题，以显示我把它放在了哪里，但它仍然出现了相同的错误。是因为我在应用程序中创建了validators文件夹，而不是rails生成的吗？@benjs.1请确保重新启动了服务器/控制台。不，不需要使用发电机。您可以根据需要扩展应用程序。
 require File.expand_path('../boot', __FILE__)

require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)
module ThorCinema
class Application < Rails::Application
# Settings in config/environments/* take precedence over those specified here.
# Application configuration should go into files in config/initializers
# -- all .rb files in that directory are automatically loaded.

# Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
# Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
# config.time_zone = 'Central Time (US & Canada)'

# The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
# config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]
# config.i18n.default_locale = :de

# Do not swallow errors in after_commit/after_rollback callbacks.
config.active_record.raise_in_transactional_callbacks = true    
config.autoload_paths << Rails.root.join('app', 'validators')
end

end

config.autoload_paths << Rails.root.join('app', 'validators')