[Rails] Multiple classes on form text_field

Consider :

- - - -

<% form_for(@z) do |f| %>
<%= f.error_messages %>
<p>
<%= f.label :x %><br />
<%= f.text_field :x, :class => 's' %>
</p>
<p>
<%= f.submit 'Update' %>
</p>
<% end %>

- - - -

The above form works fine. What I want to do is have two classes, s and
t, associated with text_field :x.

The following does not work.

- - - -

<% form_for(@z) do |f| %>
<%= f.error_messages %>
<p>
<%= f.label :x %><br />
<%= f.text_field :x, :class => {'s', 't'} %>
</p>
<p>
<%= f.submit 'Update' %>
</p>
<% end %>

- - - -

The code above will generate a single class class="st"

How can I have two classes in the same field using form helper? Do I
have to generate my own html?
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