gistfile1.rhtml

table_for @discount_codes do |table|
  table.column :code
  table.column :description
  table.column :max_uses, :label => 'Maximum Uses' do |discount_code|
    discount_code.max_uses || 'Unlimited'
  end
end

# I want to be able to do this:

<%- table_for @discount_codes do |table| -%>
  <%- table.column :code -%>
  <%- table.column :description -%>
  <%- table.column :max_uses, :label => 'Maximum Uses' do |discount_code| -%>
    You have <%= discount_code.max_uses || 'Unlimited' %> discount codes!
  <%- end -%>
<%- end -%>