将公共属性注入activerecord类的正确方法是什么?

http://pastie.org/1098444 )

puts "Name_and_key was referenced."

module Name_and_key

  def normalize(s)
    s.mb_chars.normalize(:kd).gsub(/[^\-x00-\x7F]/n, '').to_s
  end

  def name=(name)
    self[:name] = name
    self[:key] = normalize(name).downcase
  end

  def name
    self[:name]
  end

  def key=(key)
    self[:key] = normalize(key).downcase
  end

  def key
    self[:key]
  end

end

但这些值似乎并没有到达模型中。

 class Category < ActiveRecord::Base
  include Name_and_key

  has_many :tiles
  validates_presence_of :name, :key
end

cat = Category.create do |c|
 c.name = "cat"
end

ActiveRecord::语句无效:SQLite3::ConstraintException:类别。名称不能为空:插入“类别”(“已创建”、“已更新”、“id”)值('2010-08-15 23:20:43','2010-08-15 23:20:43',980190962)

失败的单元测试

test "can be created" do
cat = Category.create do |c|
  c.name = "cat"
end
tile = Tile.create do |t|
  t.name = "test"
  t.category = cat
end
assert tile.save

终止

  1) Error:

可以创建测试(TiletTest): /用户/janlipens/。rvm/gems/ruby-1.9。2-rc2@rails3/gems/activerecord-3.0。0.rc/lib/active\u record/connection\u adapters/abstract\u adapter。rb:202:in rescue in log' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/connection_adapters/abstract_adapter.rb:194:in 日志' /用户/janlipens/。rvm/gems/ruby-1.9。2-rc2@rails3/gems/activerecord-3.0。0.rc/lib/active_record/connection_adapters/sqlite_adapter。rb:135:in execute' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/connection_adapters/abstract/database_statements.rb:239:in 插入固定装置' /用户/janlipens/。rvm/gems/ruby-1.9。2-rc2@rails3/gems/activerecord-3.0。0.rc/lib/active_record/fixtures。rb:634:in block in insert_fixtures' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:570:in 各自的 /用户/janlipens/。rvm/gems/ruby-1.9。2-rc2@rails3/gems/activerecord-3.0。0.rc/lib/active_record/fixtures。rb:570:in insert_fixtures' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:514:in /用户/janlipens/。rvm/gems/ruby-1.9。2-rc2@rails3/gems/activerecord-3.0。0.rc/lib/active_record/fixtures。rb:514:in each' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:514:in “创建_装置”中的块(3层) /用户/janlipens/。rvm/gems/ruby-1.9。2-rc2@rails3/gems/activerecord-3.0。0.rc/lib/active\u record/connection\u adapters/abstract/database\u语句。rb:139:in transaction' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:512:in “创建_装置”中的块(2层) /用户/janlipens/。rvm/gems/ruby-1.9。2-rc2@rails3/gems/activerecord-3.0。0.rc/lib/active\u record/connection\u adapters/abstract\u adapter。rb:104:in disable_referential_integrity' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:503:in /用户/janlipens/。rvm/gems/ruby-1.9。2-rc2@rails3/gems/activesupport-3.0。0.rc/lib/active_support/benchmarkable。rb:55:in silence' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:502:in 创建_装置' load_fixtures' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activerecord-3.0.0.rc/lib/active_record/fixtures.rb:926:in 安装固定装置' /用户/janlipens/。rvm/gems/ruby-1.9。2-rc2@rails3/gems/activesupport-3.0。0.rc/lib/active_support/callbacks。rb:409:in _run_setup_callbacks' /Users/janlimpens/.rvm/gems/ruby-1.9.2-rc2@rails3/gems/activesupport-3.0.0.rc/lib/active_support/testing/setup_and_teardown.rb:34:in