Add VotationType model

app/models/concerns/questionable.rb

@@ -0,0 +1,12 @@
+module Questionable
+  extend ActiveSupport::Concern
+
+  included do
+    has_one :votation_type, as: :questionable, dependent: :destroy
+    delegate :max_votes, :multiple?, :vote_type, to: :votation_type, allow_nil: true
+  end
+
+  def unique?
+    votation_type.nil? || votation_type.unique?
+  end
+end

app/models/poll/question.rb

@@ -1,6 +1,7 @@
 class Poll::Question < ApplicationRecord
   include Measurable
   include Searchable
+  include Questionable
 
   acts_as_paranoid column: :hidden_at
   include ActsAsParanoidAliases

app/models/votation_type.rb

@@ -0,0 +1,17 @@
+class VotationType < ApplicationRecord
+  belongs_to :questionable, polymorphic: true
+
+  QUESTIONABLE_TYPES = %w[Poll::Question].freeze
+
+  enum vote_type: %w[unique multiple]
+
+  validates :questionable, presence: true
+  validates :questionable_type, inclusion: { in: ->(*) { QUESTIONABLE_TYPES }}
+  validates :max_votes, presence: true, if: :max_votes_required?
+
+  private
+
+    def max_votes_required?
+      multiple?
+    end
+end

db/migrate/20220323233643_add_votation_types.rb

@@ -0,0 +1,12 @@
+class AddVotationTypes < ActiveRecord::Migration[5.2]
+  def change
+    create_table :votation_types do |t|
+      t.integer :questionable_id
+      t.string :questionable_type
+      t.integer :vote_type
+      t.integer :max_votes
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -1698,6 +1698,15 @@ ActiveRecord::Schema.define(version: 2022_09_15_154808) do
     t.index ["user_id"], name: "index_visits_on_user_id"
   end
 
+  create_table "votation_types", force: :cascade do |t|
+    t.integer "questionable_id"
+    t.string "questionable_type"
+    t.integer "vote_type"
+    t.integer "max_votes"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
   create_table "votes", id: :serial, force: :cascade do |t|
     t.string "votable_type"
     t.integer "votable_id"

spec/factories/votation_type.rb

@@ -0,0 +1,14 @@
+FactoryBot.define do
+  factory :votation_type do
+    factory :votation_type_unique do
+      vote_type { "unique" }
+    end
+
+    factory :votation_type_multiple do
+      vote_type { "multiple" }
+      max_votes { 3 }
+    end
+
+    association :questionable, factory: :poll_question
+  end
+end

spec/models/votation_type_spec.rb

@@ -0,0 +1,35 @@
+require "rails_helper"
+
+describe VotationType do
+  let(:vote_types) { %i[votation_type_unique votation_type_multiple] }
+  let(:votation_type) { build(vote_types.sample) }
+
+  it "is valid" do
+    expect(votation_type).to be_valid
+  end
+
+  it "is not valid without questionable" do
+    votation_type.questionable = nil
+
+    expect(votation_type).not_to be_valid
+  end
+
+  it "is not valid when questionable_type is not allowed" do
+    votation_type.questionable_type = Poll::Answer
+
+    expect(votation_type).not_to be_valid
+    expect(votation_type.errors[:questionable_type]).to include "is not included in the list"
+  end
+
+  it "is not valid when max_votes is undefined for multiple votation_type" do
+    votation_type.max_votes = nil
+    votation_type.vote_type = "unique"
+
+    expect(votation_type).to be_valid
+
+    votation_type.vote_type = "multiple"
+
+    expect(votation_type).not_to be_valid
+    expect(votation_type.errors[:max_votes]).to include "can't be blank"
+  end
+end