模块未在控制器中加载（undefined_method错误）

Question

before applying the BeforeOrAfter module in my view, trying to get it to work in the console. getting the NoMethodError: undefined method before_or_after' for #` error:

> s = Artist.find(1)
> s.events.each do |event|
>     before_or_after(event.date)
> end

I chose to create a new modules subdirectory, app/modules/before_or_after.rb:

module BeforeOrAfter
  attr_reader :past
  attr_reader :future

  require "date"
  def initialize
    @datetime = DateTime.new
    @future = []
    @past = []
  end

  def before_or_after(datetime)
    if datetime < DateTime.now
      @past << datetime
    else
      @future << datetime
    end
  end
end

including it in application_controller.rb because all my controllers will be using it:

class ApplicationController < ActionController::Base
  include BeforeOrAfter

Answer 1

I don't think that the rails environment is eager loaded before running the console. If you're in the console make sure you require that file before using that method.

If you are running the full Rails app then your file should be auto loaded. You can read more about auto loading and the need for requires here .

Answer 2

To run in your rails app, please add below line in config/application.rb,

config.autoload_paths << Rails.root.join('app/modules')

To run in console, include your module first like,

include BeforeOrAfter