twilio_changes.rb

#################### app/models/task.rb

class Task < ApplicationRecord

  belongs_to :user
  belongs_to :lead, required: false
  belongs_to :creator, class_name: "User", foreign_key: "creator_id"
  belongs_to :responsible, class_name: "User", foreign_key: "responsible_id"

  update_index 'leads#lead', :lead
  update_index 'lead_timeline#task', :self

  attr_accessor :contact_name, :contact_email

  scope :finished, -> {where( finished: true )}
  scope :of_type, lambda {|task_type| where(task_type: task_type) }

  def message
    Message.find(message_id)
  end

  def message_id
    link_to_action.delete('/messages').to_i
  end

  def user_phone
    user.try(:phone)
  end

  def send_sms(message = nil)
    message ||= "Hey #{user.try(:full_name)}, you have a new task. Log in to your PropertySimple CRM Account to manage it."

    TwilioHelper::send_sms(phone: user_phone, message_content: message, origin_number: user.try(:sms_origin_number))
  end

end

#################### app/models/user.rb

def sms_origin_number
    return '+15005550006' unless Rails.env.production?
    case timezone
    when 'America/Phoenix'
      Rails.application.secrets.twilio_az_number
    when 'America/Los_Angeles'
      Rails.application.secrets.twilio_ca_number
    else
      Rails.application.secrets.twilio_az_number
    end
  end

  private
#################### config/secrets.yml

test:
  secret_key_base: ba3a773fc6c584345a79a3eb9c78e736970879e4a0c7088c761fd2d307c5eab2f30fa83a790b028b8d7a85c71d2ee9cfbb4d15bd489023e73e0441141d75e699
  twilio_acc_sid: AC9dc7cd0aed77930b5d42703c37c5c252

  twilio_token: 3a49bffb76d68e384a1e56c71ef47777
  twilio_az_number: '+19493045404'
  twilio_ca_number: '+16025170566'

  twilio_testing_valid_receiver_number: '+15005550006' # Valid number
  twilio_testing_number: '+56952551372' # Pablo's number


#################### app/lib/twilio_helper.rb

class TwilioHelper
  @@twilio_acc_sid   = Rails.application.secrets.twilio_acc_sid
  @@twilio_token     = Rails.application.secrets.twilio_token
  @@twilio_az_number = Rails.application.secrets.twilio_az_number

  @@twilio_testing_number = Rails.application.secrets.twilio_testing_number
  @@twilio_testing_valid_receiver_number = Rails.application.secrets.twilio_valid_receiver_number

  def self.send_sms(phone: , message_content:, origin_number: nil)
    origin_number ||= @@twilio_az_number
    client = Twilio::REST::Client.new @@twilio_acc_sid, @@twilio_token

    if not Rails.env.production? and not is_a_test_number?(phone)
      phone = @@twilio_testing_number
    end

    client.messages.create(
      from:  origin_number,
      to: phone,
      body: message_content,
    )
  end

  def self.is_a_test_number?(number)
    [
      @@twilio_testing_valid_receiver_number.to_s
    ].include?(number)
  end

end

#################### spec/factories/task.rb

FactoryGirl.define do
  factory :task do
  end
end


#################### spec/models/task_spec.rb

require 'rails_helper'

RSpec.describe Task, type: :model do
  describe '.notify :new' do
    it 'send successfully an sms' do
      task = create(:task)
      task.user = create(:user)
      task.user.phone = Rails.application.secrets.twilio_valid_receiver_number
      task.user.save
      task.save

      expect(task.user_id).to_not be_nil

      expect(task.send_sms).to be_truthy
    end
  end
end