Add offline model and "new" form/controller

app/controllers/contests_controller.rb

@@ -1,6 +1,6 @@
 class ContestsController < ApplicationController
   before_action :set_contest, only: %i[ destroy edit show update ]
-  skip_before_action :require_authentication, only: %i[ scoreboard ]
+  skip_before_action :require_authentication, only: %i[ scoreboard offline_new ]
 
   def index
     authorize :contest
@@ -99,6 +99,21 @@ class ContestsController < ApplicationController
     render :scoreboard
   end
 
+  def offline_new
+    @contest = Contest.find_by(slug: params[:id])
+    unless @contest && @contest.public
+      skip_authorization
+      not_found and return
+    end
+    authorize :contest
+
+    I18n.locale = @contest.lang
+
+    @title = I18n.t("contests.scoreboard.title", name: @contest.name)
+
+    @offline = Offline.new
+  end
+
   private
 
   def set_badges

app/models/contest.rb

@@ -31,6 +31,7 @@ class Contest < ApplicationRecord
   has_many :contestants, dependent: :destroy
   has_many :puzzles, dependent: :destroy
   has_many :messages, dependent: :destroy
+  has_many :offlines, dependent: :destroy
 
   friendly_id :name, use: :slugged
 

app/models/offline.rb

@@ -0,0 +1,27 @@
+# == Schema Information
+#
+# Table name: offlines
+#
+#  id         :integer          not null, primary key
+#  end_time   :datetime
+#  start_time :datetime         not null
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#  contest_id :integer          not null
+#
+# Indexes
+#
+#  index_offlines_on_contest_id  (contest_id)
+#
+# Foreign Keys
+#
+#  contest_id  (contest_id => contests.id)
+#
+class Offline < ApplicationRecord
+  belongs_to :contest
+
+  has_one_attached :start_image
+  has_one_attached :end_image
+
+  validates :start_time, presence: true
+end

app/policies/contest_policy.rb

@@ -47,6 +47,22 @@ class ContestPolicy < ApplicationPolicy
     record.user.id == user.id || user.admin?
   end
 
+  def offline_new?
+    true
+  end
+
+  def offline_create?
+    true
+  end
+
+  def offline_edit?
+    true
+  end
+
+  def offline_update?
+    true
+  end
+
   def scoreboard?
     true
   end

app/views/contests/offline_new.html.slim

@@ -0,0 +1,25 @@
+= form_with model: @offline, url: "/public/#{@contest.id}/offline" do |form|
+  .row.mb-3
+    .col
+      .form-text.mb-1
+        = t("puzzles.image_select")
+      = form.file_field :start_image, accept: "image/*", class: "form-control"
+      .form-text.error-message style="display: none;" id="image-error-message"
+        = t("puzzles.form.file_too_big")
+      javascript:
+        function setMaxUploadSize() {
+          const el = document.querySelector('input[type="file"]');
+          el.onchange = function() {
+            if(this.files[0].size > 2 * 1024 * 1024) {
+              document.getElementById('image-error-message').style.display = 'block';
+              this.value = "";
+            } else {
+              document.getElementById('image-error-message').style.display = 'none';
+            }
+          };
+        }
+
+        setMaxUploadSize();
+  .row.mt-3
+    .col
+      = form.submit t("helpers.buttons.add"), class: "btn btn-primary"