indicar cuando un campo es obligatorio

app/models/post/template_field.rb

@@ -107,6 +107,13 @@ class Post
       contents.fetch('open', value.count < 2)
     end
 
+    def human
+      h = key.humanize
+      h = h + ' *' if required?
+
+      h
+    end
+
     # Obtiene los valores posibles para el campo de la plantilla
     def values
       return '' if %w[string text].include? value

app/views/posts/_form.haml

@@ -78,7 +78,7 @@
   - @post.template_fields.each do |template|
     - next unless type = template.type
     .form-group
-      = label_tag "post_#{template}", template.to_s.humanize
+      = label_tag "post_#{template}", template.human
       - name = "post[#{template}]"
       - value = @post.new? ? template.values : @post.get_front_matter(template)
       - case type
@@ -96,6 +96,7 @@
         = select_tag name, options_for_select(template.values, @post.get_front_matter(template)),
           { class: 'form-control select2',
           multiple: template.multiple?,
+          required: template.required?,
           data: { tags: template.open?,
           placeholder: t('posts.select.placeholder')}}
         - if template.open?