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