Ruby on Rails

i need something like this

index.html.erb

<th><%= link_to 'cost', :action => 'search', [b]:order[/b] => 'cost'
%></th>

cars_controller.rb

def search
@order = [b]:order[/b]
@cars = Car.paginate :page => params[:page], :order => @order
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @cars }
end
end

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