這裏的模型:爲什麼這個datamapper對象不會保存?
class Target
include DataMapper::Resource
property :id, Serial
property :owed, Integer, :default => 0, :required => true
property :served, Integer, :default => 0, :required => true
def go
@owed -= 1
@served += 1
save
end
end
當我做到這一點:這似乎
t = Target.first
t.go
不更新數據庫。有任何想法嗎?