QR codes generation

app/controllers/contestants_controller.rb

@@ -2,7 +2,7 @@ class ContestantsController < ApplicationController
   include CompletionsConcern
   include ContestantsConcern
 
-  before_action :set_contest, only: %i[ index edit new create update destroy import upload_csv convert_csv finalize_import export ]
+  before_action :set_contest, only: %i[ index edit new create update destroy import upload_csv convert_csv finalize_import export generate_qrcodes ]
   before_action :set_contestant, only: %i[ destroy edit update]
   before_action :set_completions, only: %i[edit update ]
   skip_before_action :require_authentication, only: %i[ get_public_completion post_public_completion public_completion_updated ]
@@ -42,7 +42,7 @@ class ContestantsController < ApplicationController
 
     if @contestant.update(contestant_params)
       update_contestant_categories
-      redirect_to @contest, notice: t("contestants.edit.notice")
+      redirect_to contest_contestants_path(@contest), notice: t("contestants.edit.notice")
     else
       render :edit, status: :unprocessable_entity
     end
@@ -120,6 +120,12 @@ class ContestantsController < ApplicationController
     end
   end
 
+  def generate_qrcodes
+    authorize @contest
+
+    @contestants = @contest.contestants.sort_by { |contestant| contestant.name }
+  end
+
   def get_public_completion
     skip_authorization