ruby on rails - Simple_form adding class to form

Question

I am using simple_form in my Rails application, I tried to add form-horizontal class to my form.

<form accept-charset="UTF-8" action="/account/orders" class="simple_form new_order" data-validate="true" enctype="multipart/form-data" id="new_order" method="post" novalidate="novalidate">

When I use html: { class: "form-horizontal" } it change class="simple_form new_order" to class="simple_form form-horizontal".

What should I do to keep new_order class?

Answer 1

it works for me like this

= simple_form_for @model, html: { class: "form-horizontal"} do |f|
  ...

it compiles to

<form accept-charset="UTF-8" action="/numbers" class="simple_form form-horizontal" id="new_number" method="post">