core/db/migrate/20140130182100_change_fields_external_school_record.rb
class ChangeFieldsExternalSchoolRecord < ActiveRecord::Migration[4.2]
def change
add_column :gaku_external_school_records, :units_absent, :integer
add_column :gaku_external_school_records, :total_units, :integer
remove_column :gaku_external_school_records, :attendance_rate
end
end