working on question_lists

app/models/question_list.rb

@@ -0,0 +1,26 @@
+class QuestionList < ApplicationRecord
+
+  validates :name, presence: true
+  validates :question_ids, presence: true
+
+  attr_accessor :question_id_array
+  before_validation :convert_question_id_array
+  after_initialize :set_question_id_array
+
+  def questions
+    question_id_array.collect { |id| Question.where(id: id).first }
+  end
+
+  private
+
+    def convert_question_id_array
+      return if question_id_array.blank?
+      self.question_ids = question_id_array.reject { |id| id.to_s.empty? }.join(',')
+    end
+
+    def set_question_id_array
+      return if question_ids.blank?
+      self.question_id_array = question_ids.split(',').map(&:to_i)
+    end
+
+end