Add validations for changing votation type

app/models/votation_type.rb

@@ -1,6 +1,8 @@
 class VotationType < ApplicationRecord
   belongs_to :questionable, polymorphic: true
 
+  validate :cannot_be_open_ended_if_question_has_options
+
   QUESTIONABLE_TYPES = %w[Poll::Question].freeze
 
   enum :vote_type, { unique: 0, multiple: 1, open: 2 }
@@ -18,4 +20,10 @@ class VotationType < ApplicationRecord
     def max_votes_required?
       multiple?
     end
+
+    def cannot_be_open_ended_if_question_has_options
+      if questionable&.question_options&.any? && !accepts_options?
+        errors.add(:vote_type, :cannot_change_to_open_ended)
+      end
+    end
 end