Make asking for missing pieces in forms optional

app/controllers/contests_controller.rb

@@ -328,7 +328,7 @@ class ContestsController < ApplicationController
   end
 
   def settings_onsite_params
-    params.expect(contest: [ :code, :organizer_form ])
+    params.expect(contest: [ :code, :organizer_form, :missing_pieces ])
   end
 
   def settings_online_params

app/models/contest.rb

@@ -8,6 +8,7 @@
 #  duration           :string
 #  duration_seconds   :integer
 #  lang               :string           default("en")
+#  missing_pieces     :boolean
 #  name               :string
 #  offline_form       :boolean          default(FALSE)
 #  organizer_form     :boolean

app/views/completions/_form.html.slim

@@ -78,6 +78,7 @@
         javascript:
           savetime = "";
           ispatch = #{method == :patch};
+          showMissingPieces = #{@completion.contest.missing_pieces}
 
           // Actions for radio buttons.
           completed_radio_yes_el = document.getElementById('completed_radio_yes');
@@ -90,7 +91,7 @@
             if (ispatch) timeEl.value = '#{@completion.display_time_from_start}';
             else timeEl.value = savetime;
             timeEl.parentElement.parentElement.parentElement.style.display = '';
-            missingPiecesEl.style.display = 'block';
+            if (showMissingPieces) missingPiecesEl.style.display = 'block';
             remainingPiecesEl.style.display = 'none';
             submitEl.style.display = '';
             if (refreshEl) refreshEl.style.display = '';
@@ -150,7 +151,7 @@
           updateTime();
   
     / Text field for recording the missing pieces, if any.
-    .row.mt-3 id="missing_pieces" style="display: #{@completion.completed ? "" : "none"};"
+    .row.mt-3 id="missing_pieces" style="display: #{@completion.completed && @completion.contest.missing_pieces ? "" : "none"};"
       .col
         .form-floating
           = form.text_field :missing_pieces, autocomplete: "off", class: "form-control"

app/views/contests/settings_onsite_edit.html.slim

@@ -10,13 +10,17 @@
       .form-check.form-switch
         = form.check_box :organizer_form, class: "form-check-input"
         = form.label :organizer_form
-      .form-text = t("activerecord.attributes.contest.organizer_form")
   .row.mt-3.mb-3
     .col
       .form-floating
         = form.text_field :code, autocomplete: "off", class: "form-control"
         = form.label :code, class: "required"
         .form-text = t("activerecord.attributes.contest.code_description")
+  .row.mt-1
+    .col
+      .form-check.form-switch
+        = form.check_box :missing_pieces, class: "form-check-input"
+        = form.label :missing_pieces
   .row.mt-4
     .col
       = form.submit t("helpers.buttons.update"), class: "btn btn-primary"

config/locales/en.yml

@@ -59,6 +59,7 @@ en:
         duration: Duration
         duration_description: Format h:mm or hh:mm
         lang: Language for the public scoreboard
+        missing_pieces: Ask for missing pieces for completed puzzles
         name: Name
         offline_form: Enable the offline participation form
         offline_form_description: Offline participants will have to fill the form by providing an image taken of the puzzle before starting solving it, and validate their finish time with an upload of an image of the completed puzzle

config/locales/fr.yml

@@ -30,6 +30,7 @@ fr:
         duration: Durée
         duration_description: Format h:mm ou hh:mm
         lang: Langue pour le classement public
+        missing_pieces: Demander le nombre de pièces manquantes pour les puzzles complétés
         name: Nom
         offline_form: Activer le formulaire de participation hors-ligne
         offline_form_description: Les participant.e.s hors-ligne pourront participer en prenant une photo du puzzle avant de le commencer, puis valider leur temps avec une photo du puzzle une fois complété

db/migrate/20260825071844_add_missing_pieces_to_contest.rb

@@ -0,0 +1,5 @@
+class AddMissingPiecesToContest < ActiveRecord::Migration[8.0]
+  def change
+    add_column :contests, :missing_pieces, :boolean
+  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: 2026_07_30_055752) do
+ActiveRecord::Schema[8.0].define(version: 2026_08_25_071844) do
   create_table "active_storage_attachments", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -107,6 +107,7 @@ ActiveRecord::Schema[8.0].define(version: 2026_07_30_055752) do
     t.boolean "show_stopwatch"
     t.boolean "organizer_form"
     t.integer "event_id"
+    t.boolean "missing_pieces"
     t.index ["event_id"], name: "index_contests_on_event_id"
     t.index ["slug"], name: "index_contests_on_slug", unique: true
     t.index ["user_id"], name: "index_contests_on_user_id"

spec/factories/contests.rb

@@ -8,6 +8,7 @@
 #  duration           :string
 #  duration_seconds   :integer
 #  lang               :string           default("en")
+#  missing_pieces     :boolean
 #  name               :string
 #  offline_form       :boolean          default(FALSE)
 #  organizer_form     :boolean