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							|  | class HackSet < ApplicationRecord
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							|  |   validates :input, presence: { message: "测试集输入不能为空" }
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							|  |   validates :output, uniqueness: { message: "测试集输出不能为空" }
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							|  |   # 编程题测试集
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							|  |   belongs_to :hack
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							|  | end
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