原创作者: hideto
阅读:1193次
评论:0条
更新时间:2011-05-26
没什么新意:
>> Task.sum(:priority)
=> 15
>> Task.sum(:priority, :conditions => 'complete=0')
=> 13
>> Task.maximum(:priority)
=> 4
>> Task.minimum(:priority)
=> 1
>> Task.average(:priority)
=> 2.5
>> p = Project.find(:first)
=> #<Project:0x32dce38 @attrbutes={"name" => "Programming", "id" => "1"}>
>> p.tasks.sum(:priority)
=> 9
>> p.tasks.sum(:priority, :conditions => 'complete=0')
=> 7
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