class Ahoy::Message
  include Mongoid::Document

  belongs_to :user, polymorphic: true, optional: true, index: true

  field :to_ciphertext, type: String
  field :to_bidx, type: String
  field :mailer, type: String
  field :subject, type: String
  field :sent_at, type: Time

  index({to_bidx: 1})

  <%= lockbox_method %> :to
  blind_index :to
end