no ofrecer la renderización de layouts ignorados

app/models/layout.rb

@@ -28,6 +28,11 @@ Layout = Struct.new(:site, :name, :meta, :metadata, keyword_init: true) do
     meta[:hidden].present?
   end
 
+  # Detecta si el layout no es renderizable
+  def ignored?
+    @ignored ||= site.config['ignored_layouts']&.include? name.to_s
+  end
+
   # Los metadatos del Layout.
   #
   # TODO: Inicializar con valores por defecto o usar Hash#default_proc

app/views/posts/show.haml

@@ -12,12 +12,12 @@
         edit_site_post_path(@site, @post.id),
         class: 'btn btn-block'
 
-      = link_to t('posts.preview.btn'),
-        site_post_preview_path(@site, @post.id),
-        class: 'btn btn-block',
-        target: '_blank',
-        rel: 'noopener'
-      .alert.alert-info= t('posts.preview.alert')
+      - unless @post.layout.ignored?
+        = link_to t('posts.preview.btn'),
+          site_post_preview_path(@site, @post.id),
+          class: 'btn btn-block',
+          target: '_blank',
+          rel: 'noopener'
 
       %table.table.table-condensed
         %thead