Permit to modify contestants categories

app/views/contestants/_form.html.slim

@@ -15,6 +15,14 @@
         = form.label :email
     .form-text
       = t("activerecord.attributes.contestant.email_description")
+  - if @contest.categories
+    .row.mt-4
+      .col
+        - @contest.categories.each do |category|
+          .form-check.form-switch
+            = form.check_box "category_#{category.id}".to_sym, class: "form-check-input", checked: @contestant.categories.where(id: category.id).any?
+            = form.label category.name
+
   .row.mt-4
     .col
       - if method == :patch

app/views/contests/show.html.slim

@@ -54,13 +54,13 @@ javascript:
               option value=category.id
                 = category.name
           javascript:
-            const select = document.getElementById('categories');
-            const urlParams = new URLSearchParams(window.location.search);
-            const selectedCategory = urlParams.get('category');
-            Array.from(select.children).forEach((option) => {
+            categorySelectEl = document.getElementById('categories');
+            urlParams = new URLSearchParams(window.location.search);
+            selectedCategory = urlParams.get('category');
+            Array.from(categorySelectEl.children).forEach((option) => {
               if (option.value == selectedCategory) option.selected = true;
             });
-            select.addEventListener('change', (e) => {
+            categorySelectEl.addEventListener('change', (e) => {
               window.location.href = `#{contest_path(@contest)}?category=${e.target.value}`
             })
     .d-flex.flex-column style="overflow-y: auto"