fixing bug with last sent attempt

app/controllers/attempts_controller.rb

@@ -4,7 +4,7 @@ class AttemptsController < ApplicationController
 
   def twilio
     recipient = Recipient.where(phone: twilio_params['From']).first
-    attempt = recipient.attempts.last
+    attempt = recipient.attempts.last_sent.first
 
     if (twilio_params[:Body].downcase == 'stop')
       attempt.recipient.update_attributes(opted_out: true)

app/models/attempt.rb

@@ -19,6 +19,7 @@ class Attempt < ApplicationRecord
   scope :with_answer, -> { where('answer_index is not null or open_response_id is not null')}
   scope :with_no_answer, -> { where('answer_index is null and open_response_id is null')}
   scope :not_yet_responded, -> { where(responded_at: nil) }
+  scope :last_sent, -> { order(sent_at: :desc) }
 
   def messages
     if student.present?

spec/controllers/attempts_controller_spec.rb

@@ -26,7 +26,8 @@ RSpec.describe AttemptsController, type: :controller do
       schedule: schedule,
       recipient: recipients.first,
       recipient_schedule: recipient_schedule,
-      question: questions.first
+      question: questions.first,
+      sent_at: Time.new
     )
   }
   let!(:attempt) {
@@ -34,7 +35,8 @@ RSpec.describe AttemptsController, type: :controller do
       schedule: schedule,
       recipient: recipients.first,
       recipient_schedule: recipient_schedule,
-      question: questions.first
+      question: questions.first,
+      sent_at: Time.new
     )
   }
   let!(:attempt2) {
@@ -42,7 +44,8 @@ RSpec.describe AttemptsController, type: :controller do
       schedule: schedule,
       recipient: recipients.last,
       recipient_schedule: recipient_schedule2,
-      question: questions.first
+      question: questions.first,
+      sent_at: Time.new
     )
   }