How do I create a migration in ruby where the default is a string rather than an Integer, I want to store enum into the database, but I do not want to store it as Integer, because then it does not make sense to another application that wants to use the same table. How do I do default: "female" instead of default:0

class AddSexToUsers < ActiveRecord::Migration
  def change
    add_column :users, :sex, :integer, default: 0
  end
end
class User < ActiveRecord::Base
  enum sex: [:female, :male]
  has_secure_password
end

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