QR codes generation

Gemfile

@@ -46,6 +46,7 @@ gem "bootstrap", "~> 5.3.3"
 gem "friendly_id", "~> 5.5.0"
 gem "csv"
 gem "damerau-levenshtein"
+gem "rqrcode", "~> 3.0"
 
 group :development, :test do
   # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem

Gemfile.lock

@@ -100,6 +100,7 @@ GEM
       rack-test (>= 0.6.3)
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
+    chunky_png (1.4.0)
     concurrent-ruby (1.3.5)
     connection_pool (2.5.4)
     crass (1.0.6)
@@ -291,6 +292,10 @@ GEM
     reline (0.6.2)
       io-console (~> 0.5)
     rexml (3.4.4)
+    rqrcode (3.1.0)
+      chunky_png (~> 1.0)
+      rqrcode_core (~> 2.0)
+    rqrcode_core (2.0.0)
     rspec-core (3.13.6)
       rspec-support (~> 3.13.0)
     rspec-expectations (3.13.5)
@@ -455,6 +460,7 @@ DEPENDENCIES
   puma (>= 5.0)
   pundit (~> 2.5)
   rails (~> 8.0.2)
+  rqrcode (~> 3.0)
   rspec-rails
   rubocop-rails-omakase
   selenium-webdriver

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
 

app/models/contestant.rb

@@ -7,6 +7,7 @@
 #  email          :string
 #  name           :string
 #  projected_time :string
+#  qrcode         :string
 #  time_seconds   :integer
 #  created_at     :datetime         not null
 #  updated_at     :datetime         not null
@@ -27,6 +28,7 @@ class Contestant < ApplicationRecord
   has_and_belongs_to_many :categories
 
   before_validation :initialize_time_seconds_if_empty
+  before_commit :generate_qrcode, on: :create
 
   validates :name, presence: true
   validates :time_seconds, presence: true
@@ -48,4 +50,17 @@ class Contestant < ApplicationRecord
       self.time_seconds = 0
     end
   end
+
+  def generate_qrcode
+    host = Rails.application.config.action_controller.default_url_options[:host]
+    qrcode = RQRCode::QRCode.new("https://#{host}/public/p/#{self.generate_token_for(:token)}")
+    self.qrcode = qrcode.as_svg(
+      color: "000",
+      shape_rendering: "crispEdges",
+      module_size: 3,
+      standalone: true,
+      use_path: true,
+      viewbox: true
+    )
+  end
 end

app/models/offline.rb

@@ -33,7 +33,7 @@ class Offline < ApplicationRecord
   belongs_to :contestant, optional: true
   belongs_to :completion, optional: true
 
-  has_many_attached :images
+  has_many_attached :images, dependent: :destroy
 
   generates_token_for :token
 

app/models/puzzle.rb

@@ -22,7 +22,7 @@ class Puzzle < ApplicationRecord
   belongs_to :contest
 
   has_many :completions, dependent: :destroy
-  has_one_attached :image
+  has_one_attached :image, dependent: :destroy
 
   validates :name, presence: true
   validates :pieces, presence: true

app/policies/contest_policy.rb

@@ -35,6 +35,10 @@ class ContestPolicy < ApplicationPolicy
     owner_or_admin
   end
 
+  def generate_qrcodes?
+    owner_or_admin
+  end
+
   def settings_general_edit?
     edit?
   end

app/views/contestants/generate_qrcodes.html.slim

@@ -0,0 +1,11 @@
+.row.mb-4 style="height: calc(100vh - 280px)"
+  .col.d-flex.flex-column style="height: 100%"
+    .d-flex.flex-column style="overflow-y: auto"
+      - for row in 0..((@contestants.length - 1) / 4)
+        .mt-4.d-flex.flex-row
+          - for col in 0..3
+            - if row * 4 + col < @contestants.length
+              .d-flex.flex-column.ms-5 style="align-items: center"
+                = @contestants[row * 4 + col].name
+                .mt-1 style="width: 200px; height: 200px;"
+                  = @contestants[row * 4 + col].qrcode.html_safe

app/views/contestants/index.html.slim

@@ -6,6 +6,8 @@
           | + #{t("helpers.buttons.add")}
         a.ms-2.btn.btn.btn-primary href=contest_import_path(@contest) style="margin-top: -3px"
           | #{t("helpers.buttons.import")}
+        a.ms-2.btn.btn.btn-primary href=contest_generate_qrcodes_path(@contest) style="margin-top: -3px"
+          | #{t("helpers.buttons.generate_qrcodes")}
         a.ms-2.btn.btn.btn-primary href="/contests/#{@contest.id}/export.csv" style="margin-top: -3px"
           | #{t("helpers.buttons.export")}
 

config/environments/development.rb

@@ -40,6 +40,8 @@ Rails.application.configure do
   # Set localhost to be used by links generated in mailer templates.
   config.action_mailer.default_url_options = { host: "localhost", port: 3000 }
 
+  config.action_controller.default_url_options = { host: "localhost" }
+
   # Print deprecation notices to the Rails logger.
   config.active_support.deprecation = :log
 

config/environments/production.rb

@@ -60,6 +60,8 @@ Rails.application.configure do
   # Set host to be used by links generated in mailer templates.
   config.action_mailer.default_url_options = { host: "example.com" }
 
+  config.action_controller.default_url_options = { host: "public-scoreboard.org" }
+
   # Specify outgoing SMTP server. Remember to add smtp/* credentials via rails credentials:edit.
   # config.action_mailer.smtp_settings = {
   #   user_name: Rails.application.credentials.dig(:smtp, :user_name),

config/locales/en.yml

@@ -258,6 +258,7 @@ en:
       edit: "Edit"
       end: Click here to submit your completion
       export: Export
+      generate_qrcodes: Generate QR codes
       import: CSV Import
       open: Open
       refresh: Refresh

config/locales/fr.yml

@@ -229,6 +229,7 @@ fr:
       edit: "Modifier"
       end: Clique ici pour valider ta complétion du puzzle
       export: Exporter
+      generate_qrcodes: Générer des QR codes
       import: Importer un CSV
       open: Détails
       refresh: Rafraîchir

config/routes.rb

@@ -26,6 +26,7 @@ Rails.application.routes.draw do
     get "import/:id", to: "contestants#convert_csv"
     post "import/:id", to: "contestants#finalize_import"
     get "export", to: "contestants#export"
+    get "generate_qrcodes", to: "contestants#generate_qrcodes"
   end
   resources :passwords, param: :token
   resource :session

db/migrate/20251120100813_add_qrcode_to_contestant.rb

@@ -0,0 +1,5 @@
+class AddQrcodeToContestant < ActiveRecord::Migration[8.0]
+  def change
+    add_column :contestants, :qrcode, :string
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_11_18_074914) do
+ActiveRecord::Schema[8.0].define(version: 2025_11_20_100813) do
   create_table "active_storage_attachments", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -83,6 +83,7 @@ ActiveRecord::Schema[8.0].define(version: 2025_11_18_074914) do
     t.string "display_time"
     t.integer "time_seconds"
     t.string "projected_time"
+    t.string "qrcode"
     t.index ["contest_id"], name: "index_contestants_on_contest_id"
   end