limpiar tambien los hashes

app/models/post.rb

@@ -199,7 +199,9 @@ class Post
     # 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?
+      if t && t.nested?
+        v = t.array? ? v.values.map(&:to_h) : v.to_h
+      end
       { k => v }
     end.reduce(Hash.new, :merge).stringify_keys