title: ActiveModel attributes
body: <p>How do I get ActiveRecord attributes method functionality? I have this class:</p>
  
  <pre><code>class PurchaseForm
    include ActiveModel::Validations
    include ActiveModel::Conversion
    extend ActiveModel::Naming
  
    attr_accessor :name,
                  :surname,
                  :email
  
    validates_presence_of :name
  
    validates_format_of :email, :with =&gt; /^[-a-z0-9_+\.]+\@([-a-z0-9]+\.)+[a-z0-9]{2,4}$/i
  
    def initialize(attributes = {}, shop_name)
      if not attributes.nil?
        attributes.each do |name, value|
        send("#{name}=", value)
      end
    end
  
    def persisted?
      false
    end
  end
  </code></pre>
  
  <p>What I need to do, to have an attributes method to list all names and values from PurchaseForm object?</p>