diff --git a/app/models/post.rb b/app/models/post.rb
index c5b00cb8..6dd80b65 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -189,7 +189,16 @@ class Post
   def update_attributes(attrs)
     # el cuerpo se maneja por separado
     @content = attrs.delete('content') if attrs.key? 'content'
-    merge_with_front_matter! attrs.stringify_keys
+    # convertir los hashes en arrays si los campos son anidados
+    # usamos to_h por todos lados porque sino son
+    # HashWithIndifferentAccess
+    attrs = attrs.to_h.map do |k,v|
+      t = template_fields.find { |t| t.key == k }
+      v = v.values.map(&:to_h) if t && t.nested? && t.array?
+      { k => v }
+    end.reduce(Hash.new, :merge).stringify_keys
+
+    merge_with_front_matter! attrs
   end
 
   # Requisitos para que el post sea válido