rails simple_form - hidden field - create?

How can you have a hidden field with simple form?

The following code:

= simple_form_for @movie do |f|
  = f.hidden :title, "some value"
  = f.button :submit

results in this error:

undefined method `hidden' for #SimpleForm::FormBuilder:0x000001042b7cd0

try this

= f.input :title, :as => :hidden, :input_html => { :value => "some value" }

Shortest Yet !!!

=f.hidden_field :title, :value => "some value"

Shorter, DRYer and perhaps more obvious.

Of course with ruby 1.9 and the new hash format we can go 3 characters shorter with...

=f.hidden_field :title, value: "some value"

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