affiliate-api/db/migrate/20161026064026_create_units.rb

class CreateUnits < ActiveRecord::Migration[5.0]
  def change
    create_table :units do |t|
      t.string :code
      t.string :name
      t.string :fullname
      t.string :shortname
      t.integer :parent_id

      t.timestamps
    end
  end
end