poder elegir valores de una lista predefinida

Gemfile.lock

@@ -129,7 +129,7 @@ GEM
       dotenv (= 2.7.5)
       railties (>= 3.2, < 6.1)
     ed25519 (1.2.4)
-    editorial-autogestiva-jekyll-theme (0.1.0)
+    editorial-autogestiva-jekyll-theme (0.2.2)
       jekyll (~> 4.0)
       jekyll-data (~> 1.1)
       jekyll-feed (~> 0.9)

app/models/metadata_predefined_array.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+# Una lista de valores predefinidos
+class MetadataPredefinedArray < MetadataArray
+  def values
+    @values ||= layout[:metadata][name]['values'].map do |k, v|
+      { v[I18n.locale.to_s] => k }
+    end.inject(&:merge)
+  end
+end

app/models/metadata_related_posts.rb

@@ -5,7 +5,7 @@
 class MetadataRelatedPosts < MetadataArray
   # Genera un Hash de { title | slug => uuid }
   def values
-    site.posts(lang: lang).map do |p|
+    @values ||= site.posts(lang: lang).map do |p|
       { title(p) => p.uuid.value }
     end.inject(:merge)
   end

app/views/posts/attribute_ro/_predefined_array.haml

@@ -0,0 +1,5 @@
+%tr{ id: attribute }
+  %th= post_label_t(attribute, post: post)
+  %td
+    - metadata.value.each do |v|
+      %span.badge.badge-primary= metadata.values.key v

app/views/posts/attributes/_predefined_array.haml

@@ -0,0 +1,19 @@
+.form-group
+  = label_tag "post_#{attribute}", post_label_t(attribute, post: post)
+
+  .mapable{ data: { values: metadata.value.to_json,
+    'default-values': metadata.values.to_json,
+    name: "post[#{attribute}][]", list: id_for_datalist(attribute),
+    remove: 'false', legend: post_label_t(attribute, post: post),
+    described: id_for_help(attribute) } }
+
+    = text_field(*field_name_for('post', attribute, '[]'),
+      value: metadata.value.join(', '),
+      **field_options(attribute, metadata))
+
+  = render 'posts/attribute_feedback',
+    post: post, attribute: attribute, metadata: metadata
+
+  %datalist{ id: id_for_datalist(attribute) }
+    - metadata.values.keys.each do |value|
+      %option{ value: value }