Extract Class Step Three

* Move another method
* This method requires moving a constant
* Also requires changing the view to reference to the new class

example_app/app/controllers/invitations_controller.rb

@@ -1,8 +1,7 @@
class InvitationsController < ApplicationController
  EMAIL_REGEX = /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/

  def new
    @survey = Survey.find(params[:survey_id])
    @survey_inviter = SurveyInviter.new('')
  end

  def create
@@ -37,11 +36,7 @@ def valid_message?
  end

  def invalid_recipients
    @invalid_recipients ||= recipient_list.map do |item|
      unless item.match(EMAIL_REGEX)
        item
      end
    end.compact
    @survey_inviter.invalid_recipients
  end

  def recipient_list

example_app/app/models/survey_inviter.rb

@@ -1,8 +1,18 @@
class SurveyInviter
  EMAIL_REGEX = /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/

  def initialize(recipients)
    @recipients = recipients
  end

  def invalid_recipients
    @invalid_recipients ||= recipient_list.map do |item|
      unless item.match(EMAIL_REGEX)
        item
      end
    end.compact
  end

  def recipient_list
    @recipient_list ||= @recipients.gsub(/\s+/, '').split(/[\n,;]+/)
  end

example_app/app/views/invitations/new.html.erb

@@ -4,10 +4,10 @@
    <div class="error">Please provide a message</div>
  <% end %>
  <%= f.input :recipients, as: :text, input_html: { value: @recipients } %>
  <% if @invalid_recipients %>
  <% if @survey_inviter.invalid_recipients %>
    <div class="error">
      Invalid email addresses: 
      <%= @invalid_recipients.join(', ') %>
      <%= @survey_inviter.invalid_recipients.join(', ') %>
    </div>
  <% end %>
  <%= f.button :submit, value: 'Invite' %>