class CreateRegions < ActiveRecord::Migration[8.0]
  def up
    create_table :regions, id: { type: :integer, limit: 2 }, primary_key: :code do |t|
      t.column :alpha_code, 'CHAR(2)'
      t.string :name, null: false
      t.datetime :deprecated_at, index: true
      t.datetime :created_at, null: false

      t.check_constraint "REGEXP_LIKE(alpha_code, '^[A-Z]{2}$', 'c')",
                         name: 'regions_alpha_code_check'
      t.index [:alpha_code], unique: true
    end

    execute <<~SQL
      INSERT INTO
        regions(code, alpha_code, name, created_at)
      VALUES
        (392, 'JP', '日本国', #{ connection.quote Time.current })
    SQL
  end

  def down
    drop_table :regions
  end
end