Add PDF generation for QR codes

Gemfile

@@ -77,3 +77,5 @@ group :test do
 end
 
 gem "pundit", "~> 2.5"
+
+gem "ferrum_pdf", "~> 3.0"

Gemfile.lock

@@ -128,6 +128,15 @@ GEM
       railties (>= 6.1.0)
     faker (3.5.2)
       i18n (>= 1.8.11, < 2)
+    ferrum (0.17.1)
+      addressable (~> 2.5)
+      base64 (~> 0.2)
+      concurrent-ruby (~> 1.1)
+      webrick (~> 1.7)
+      websocket-driver (~> 0.7)
+    ferrum_pdf (3.0.1)
+      actionpack (>= 6.0.0)
+      ferrum (~> 0.15)
     friendly_id (5.5.1)
       activerecord (>= 4.0.0)
     fugit (1.12.1)
@@ -420,6 +429,7 @@ GEM
       activemodel (>= 6.0.0)
       bindex (>= 0.4.0)
       railties (>= 6.0.0)
+    webrick (1.9.1)
     websocket (1.2.11)
     websocket-driver (0.8.0)
       base64
@@ -452,6 +462,7 @@ DEPENDENCIES
   debug
   factory_bot_rails
   faker
+  ferrum_pdf (~> 3.0)
   friendly_id (~> 5.5.0)
   importmap-rails
   jbuilder

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 generate_qrcodes ]
+  before_action :set_contest, only: %i[ index edit new create update destroy import upload_csv convert_csv finalize_import export generate_qrcodes generate_qrcodes_pdf ]
   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 ]
@@ -96,7 +96,6 @@ class ContestantsController < ApplicationController
           if @form.email_column == -1
             Contestant.create(name: row[@form.name_column], contest: @contest)
           else
-            logger.info("Email")
             Contestant.create(name: row[@form.name_column], email: row[@form.email_column], contest: @contest)
           end
         end
@@ -115,7 +114,7 @@ class ContestantsController < ApplicationController
     respond_to do |format|
       format.csv do
         response.headers["Content-Type"] = "text/csv"
-        response.headers["Content-Disposition"] = "attachment; filename=export.csv"
+        response.headers["Content-Disposition"] = "attachment; filename=#{contest.friendly_id}_results.csv"
       end
     end
   end
@@ -126,6 +125,18 @@ class ContestantsController < ApplicationController
     @contestants = @contest.contestants.sort_by { |contestant| contestant.name }
   end
 
+  def generate_qrcodes_pdf
+    authorize @contest
+
+    @contestants = @contest.contestants.sort_by { |contestant| contestant.name }
+    @nonav = true
+
+    respond_to do |format|
+      format.html
+      format.pdf { render ferrum_pdf: {}, disposition: :inline, filename: "#{@contest.friendly_id}_qrcodes.pdf", layout: "blank" }
+    end
+  end
+
   def get_public_completion
     skip_authorization
 

app/policies/contest_policy.rb

@@ -79,6 +79,10 @@ class ContestPolicy < ApplicationPolicy
     owner_or_admin
   end
 
+  def generate_qrcodes_pdf?
+    owner_or_admin
+  end
+
   def upload_csv?
     owner_or_admin
   end

app/views/contestants/generate_qrcodes.html.slim

@@ -1,20 +1,25 @@
 - if @contest.code.present?
-  .row.mb-4 style="height: calc(100vh - 280px)"
+  .mb-4 style="height: calc(100vh - 280px)"
     .row
       .col
         .alert.alert-info
           = t("contestants.generate_qrcodes.note")
-    .col.d-flex.flex-column style="height: 100%"
+
-      .d-flex.flex-column style="overflow-y: auto"
+    a.mt-3.mb-3.btn.btn-primary href="#{contest_generate_qrcodes_pdf_path(@contest)}.pdf" target="_blank" style="margin-top: -3px"
+      = t("helpers.buttons.download_pdf")
+  
+    .col.d-flex.flex-column style="height: calc(100% - 200px)"
+      .d-flex.flex-column style="overflow-y: auto;"
         - for row in 0..((@contestants.length - 1) / 5)
           .mt-4.d-flex.flex-row
-            - for col in 0..4
+            - for col in 0..3
-              - if row * 5 + col < @contestants.length
+              - if row * 4 + col < @contestants.length
                 .d-flex.flex-column.ms-5 style="align-items: center"
-                  = @contestants[row * 5 + col].name
+                  - if @contestants[row * 4 + col].qrcode.present?
-                  - if @contestants[row * 5 + col].qrcode.present?
+                    .mt-1 style="width: 128px; height: 120px;"
-                    .mt-1 style="width: 180px; height: 180px;"
+                      = @contestants[row * 4 + col].qrcode.html_safe
-                      = @contestants[row * 5 + col].qrcode.html_safe
+                  .name.text-center.mt-3 style="font-size: 0.7rem; max-width: 128px; height: 30px;"
+                    = @contestants[row * 4 + col].name
 - else
   .row
     .col

app/views/contestants/generate_qrcodes_pdf.html.slim

@@ -0,0 +1,12 @@
+h1.text-center.mb-5 = @contest.name
+
+- for row in 0..((@contestants.length - 1) / 5)
+  .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"
+          - if @contestants[row * 4 + col].qrcode.present?
+            .mt-1 style="width: 128px; height: 120px;"
+              = @contestants[row * 4 + col].qrcode.html_safe
+          .name.text-center.mt-3 style="font-size: 0.7rem; max-width: 128px; height: 30px;"
+            = @contestants[row * 4 + col].name

app/views/layouts/blank.html.slim

@@ -0,0 +1,6 @@
+doctype html
+html
+  = render "layouts/header"
+
+  body
+    = yield

config/routes.rb

@@ -27,6 +27,7 @@ Rails.application.routes.draw do
     post "import/:id", to: "contestants#finalize_import"
     get "export", to: "contestants#export"
     get "generate_qrcodes", to: "contestants#generate_qrcodes"
+    get "generate_qrcodes_pdf", to: "contestants#generate_qrcodes_pdf"
   end
   resources :passwords, param: :token
   resource :session