This example seems unnecessary. Note that the examples of form helper…

…s depict just their traditional usage. The documentation of form_for is the one that makes the link with form builders. On the other hand, people are expected to know what's a hidden field in HTML forms.

actionpack/lib/action_view/helpers/form_helper.rb

@@ -390,14 +390,6 @@ def password_field(object_name, method, options = {})
       #
       #   hidden_field(:user, :token)
       #   # => <input type="hidden" id="user_token" name="user[token]" value="#{@user.token}" />
-      #
-      #  If you have a form object f that is using an object @client:
-      #   <%= f.hidden_field :user_id, :value => current_user.id %>
-      #   # => <input id="client_user_id" name="client[user_id]" type="hidden" value="12345" />
-      #
-      #   This passes a hidden variable user_id with the value of current_user.id, it can be accessed in the controller as:
-      #   params[:client][:user_id]
-
       def hidden_field(object_name, method, options = {})
         InstanceTag.new(object_name, method, self, options.delete(:object)).to_input_field_tag("hidden", options)
       end