db/migrate/20171011015648_add_type_and_ability_to_species.rb


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class AddTypeAndAbilityToSpecies < ActiveRecord::Migration[5.1]
  def change
    change_table :species do |t|
      t.string :type_1, null: false, default: ""
      t.string :type_2
      t.references :ability_1, null: false, default: 0
      t.references :ability_2
    end

    change_column_default :species, :type_1, nil
    change_column_default :species, :ability_1_id, nil

    add_foreign_key :species, :abilities,
      column: :ability_1_id

    add_foreign_key :species, :abilities,
      column: :ability_2_id
  end
end