class <%= migration_class_name %> < ActiveRecord::Migration<%= migration_version %>
  def self.up<% counter_cache_columns.each do |column| %>
    add_column :<%= table_name %>, :<%= column %>, :integer, null: false, default:  0
<% end %>  end

  def self.down<% counter_cache_columns.each do |column| %>
    remove_column :<%= table_name %>, :<%= column %>
<% end %>  end
end