ActiveModel::Conversion

Active Model Conversions

Handles default conversions: to_model, to_key and to_param.

Let’s take for example this non persisted object.

class ContactMessage
  include ActiveModel::Conversion

  # ContactMessage are never persisted in the DB
  def persisted?
    false
  end
end

cm = ContactMessage.new
cm.to_model == self # => true
cm.to_key           # => nil
cm.to_param         # => nil