Add a look sample via grouped_options_for_select

Author: goosys

spec/example_app/app/dashboards/product_dashboard.rb

@@ -23,7 +23,11 @@ class ProductDashboard < Administrate::BaseDashboard
     price: Field::Number.with_options(prefix: "$", decimals: 2),
     product_meta_tag: Field::HasOne.with_options(order: "meta_title"),
     release_year: Field::Select.with_options(
-      collection: -> { (Time.current.year - 10)..Time.current.year }
+      collection: -> {
+        ((Time.current.year - 10)..Time.current.year).to_a.reverse
+          .group_by { |year| "'#{(year / 10) * 10}s" }
+      },
+      look: :group
     )
   }
 

spec/example_app/app/views/fields/select/looks/group/_form.html.erb

@@ -0,0 +1,19 @@
+<div class="field-unit__label">
+  <%= f.label field.attribute %>
+</div>
+<div class="field-unit__field">
+  <%=
+    f.select(
+      field.attribute,
+      {include_blank: field.include_blank_option},
+      data: {controller: field.html_controller}
+    ) do
+  %>
+    <%= grouped_options_for_select(
+        field.selectable_options,
+        field.data,
+        prompt: true
+      )
+    %>
+  <% end %>
+</div>