Generate QR codes when not present and asked for

app/controllers/contestants_controller.rb

@@ -123,6 +123,12 @@ class ContestantsController < ApplicationController
   def generate_qrcodes
     authorize @contest
 
+    @contest.contestants.each do |contestant|
+      if !contestant.qrcode.present?
+        contestant.public_generate_qrcode
+        contestant.save
+      end
+    end
     @contestants = @contest.contestants.sort_by { |contestant| contestant.name }
   end
 

app/models/contestant.rb

@@ -43,6 +43,10 @@ class Contestant < ApplicationRecord
     end
   end
 
+  def public_generate_qrcode
+    self.generate_qrcode
+  end
+
   private
 
   def initialize_time_seconds_if_empty

app/views/contestants/generate_qrcodes.html.slim

@@ -7,5 +7,6 @@
             - if row * 4 + col < @contestants.length
               .d-flex.flex-column.ms-5 style="align-items: center"
                 = @contestants[row * 4 + col].name
+                - if @contestants[row * 4 + col].qrcode.present?
                   .mt-1 style="width: 200px; height: 200px;"
                     = @contestants[row * 4 + col].qrcode.html_safe