class CreateMileageRates < ActiveRecord::Migration[7.1]
  def change
    create_table :mileage_rates do |t|
      t.integer :year, null: false, index: { unique: true }
      t.decimal :rate_per_km, precision: 5, scale: 2, null: false
      t.timestamps
    end
    [2024, 2025, 2026].each do |year|
      MileageRate.create_or_find_by(year: year) do |rate|
        rate.rate_per_km = 0.42
      end
    end
    
  end
end