class AddStatesmanTo<%= migration_class_name %> < ActiveRecord::Migration
  def change
    add_column :<%= table_name %>, :to_state, :string
    add_column :<%= table_name %>, :metadata, :text, default: "{}"
    add_column :<%= table_name %>, :sort_key, :integer
    add_column :<%= table_name %>, :<%= parent_id %>, :integer
    add_column :<%= table_name %>, :created_at, :datetime
    add_column :<%= table_name %>, :updated_at, :datetime

    add_index :<%= table_name %>, :<%= parent_id %>
    add_index :<%= table_name %>, [:sort_key, :<%= parent_id %>], unique: true
  end
end