Conditional options for Rails methods?

Question

I want to add a class to a form_for method, but how would I do that?

<% if @plan.price == 0 %>
   <%= form_for @account, :html => { :class => 'new_account' } do |f| %>
<% else %>
   <%= form_for @account, :html => { :class => 'new_account payment-form' } do |f| %>
<% end %>

Seems there's gotta be a more concise way to pull that off.

Answer 1

您可以这样做：

<%= form_for @account, html: { class: "new_account #{(@plan.price == 0) ? '' : 'payment-form'}" } do |f| %>