[問題] Datamapper hook?

[ggegge (Egg)]

環境: Datamapper 0.9.8

這裡面有兩個class:
class User
  include DataMapper::Resource
  property :id,     Serial
  property :login,  String

  belongs_to :group

  before :create do
    throw :halt, false
  end
end

class Group
  include DataMapper::Resource
  property :id, Serial

  has n, :users
end

然後這是irb裡面的執行
irb(main):001:0> g = Group.create
 ~ INSERT INTO "groups" DEFAULT VALUES
=> #<Group id=1>

irb(main):002:0> u = User.new(:login => "a", :password=>"1",
:password_confirmation=>"1", :group=>g)
=> #<User id=nil login="a" group_id=1 crypted_password=nil salt=nil>

irb(main):003:0> u.save
=> true

irb(main):004:0> u
=> #<User id=nil login="a" group_id=1
crypted_password="135dcb3fbe621834f065cea764358b6337f03890"
salt="686dcc798935df374e38fdb0667746c2d0365e82">

問題在這裡：明明u就沒有存到database裡面去，可是它卻傳回一個true
是我的hook寫錯了嗎? 還是是別的問題?

PS. User是merb-auth的auth物件

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