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

问题

Every time I call validates_with NumberValidator. I get an uninitialized constant error. I have created a directory called validators under the "app" directory. This is what I have so far.

This is my model

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

end

This is my validator file

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

I have restarted my server and I'm just not sure what I am doing wrong

回答1:

Rails will automatically load anything under app/ assuming you follow the expected structure. The way Rails does this is with Constant Autoloading, which maps a constant, such as MyValidator to a file name, such as my_validator.rb under a directory in the autoload paths.

In order for Rails to load your NumberValidator, you should name the file number_validator.rb and put it in a folder in the autoload path, such as app/validators/number_validator.rb. You will need to restart the server if you have added a directory under app because these are initialized at boot time (be sure to run spring stop if you are using spring so it restarts too!).

Notes:

You do not need to add anything under app to your app config, so you can remove the config.autoload_paths line.
ActiveRecord::Base already includes ActiveModel::Validations, so you can also remove that include from your Worker class.

For more information on how this process works, check out the Autoloading and Reloading Constants page in the Rails Guides.

来源：https://stackoverflow.com/questions/35953656/where-exactly-do-i-put-autoload-path-for-custom-validator-in-config-application

标签

ruby-on-rails

custom-validators