我究竟应该在 config/application.rb 中将自定义验证器的自动加载路径放在哪里?

Where exactly do I put autoload path for custom validator in config/application.rb

每次调用 validates_with NumberValidator。我收到一个未初始化的常量错误。我在 "app" 目录下创建了一个名为 validators 的目录。这是我目前所拥有的。

这是我的模型

class Worker < ActiveRecord::Base
    include ActiveModel::Validations
validates_with NumberValidator

end

这是我的验证器文件

class NumberValidator < ActiveModel::Validator
    def validate(record, attribute, value)
        puts record
        puts attribute
        puts value
    end
end

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

require "rails"
# Pick the frameworks you want:
require "active_model/railtie"
require "active_job/railtie"
require "active_record/railtie"
require "action_controller/railtie"
require "action_mailer/railtie"
require "action_view/railtie"
require "sprockets/railtie"
# require "rails/test_unit/railtie"

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

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

我已经重新启动了我的服务器,但我不确定我做错了什么

假设您遵循预期的结构,

Rails 将自动加载 app/ 下的任何内容。 Rails 的方法是使用常量自动加载,它将常量(例如 MyValidator 映射到文件名,例如自动加载路径中目录下的 my_validator.rb

为了 Rails 加载您的 NumberValidator,您应该将文件命名为 number_validator.rb 并将其放在自动加载路径中的文件夹中,例如 app/validators/number_validator.rb .如果您在 app 下添加了一个目录,则需要重新启动服务器,因为它们在启动时被初始化(如果您使用 spring,请确保 运行 spring stop 所以它也重新启动了!)。

备注:

  1. 不需要app 下的任何内容添加到您的应用程序配置中,因此您可以删除 config.autoload_paths 行。
  2. ActiveRecord::Base 已经包含 ActiveModel::Validations,因此您也可以从 Worker class.
  3. 中删除 include

有关此过程如何工作的更多信息,请查看 Rails 指南中的 Autoloading and Reloading Constants 页面。