Fix `has_reacted` and `is_subscribed` not being set

app/controllers/ajax/answer_controller.rb

@@ -44,9 +44,6 @@ class Ajax::AnswerController < AjaxController
 
     return if inbox
 
-    # these assigns are needed because shared/_answerbox rely on them
-    answer.has_reacted = false
-    answer.is_subscribed = false
     @question = 1
     @response[:render] = render_to_string(partial: "answerbox", locals: { a: answer, show_question: false })
   end

app/models/answer.rb

@@ -1,7 +1,7 @@
 class Answer < ApplicationRecord
   extend Answer::TimelineMethods
 
-  attr_accessor :has_reacted, :is_subscribed
+  attr_writer :has_reacted, :is_subscribed
 
   belongs_to :user, counter_cache: :answered_count
   belongs_to :question, counter_cache: :answer_count

app/models/user.rb

@@ -122,7 +122,7 @@ class User < ApplicationRecord
 
     Retrospring::Metrics::QUESTIONS_ANSWERED.increment
 
-    Answer.create!(content:, user: self, question:)
+    Answer.create!(content:, user: self, question:, has_reacted: false, is_subscribed: true)
   end
 
   # has the user answered +question+ yet?