models and fixtures and seeds

app/models/answer.rb

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+class Answer < ApplicationRecord
+  serialize :answer
+
+  belongs_to :question
+  belongs_to :candidate
+end

app/models/candidate.rb

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+class Candidate < ApplicationRecord
+  has_many :answers
+  belongs_to :recruiter, class_name: "User"
+
+  before_create :generate_test_hash
+
+  validates_presence_of :recruiter_id
+  validates_presence_of :test_hash
+  validates_uniqueness_of :test_hash
+
+  private
+
+    def generate_test_hash
+      loop do
+        self[:test_hash] = SecureRandom.urlsafe_base64(8)
+
+        break unless Candidate.exists?(test_hash: self[:test_hash])
+      end
+    end
+end

app/models/question.rb

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+class Question < ApplicationRecord
+  serialize :input_options, Array
+
+  has_many :answers
+  belongs_to :quiz
+end

app/models/quiz.rb

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+class Quiz < ApplicationRecord
+  has_many :questions
+end

app/models/user.rb

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+class User < ApplicationRecord
+  has_secure_password
+  has_many :candidates, foreign_key: "recruiter_id"
+end