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
 

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")}