Question

有以下型号：

class TimeCorrection < ActiveRecord::Base
    validates :start_time, :end_time, :value, presence: true

    validate :time_comparison

    def time_comparison
        errors[:base] << 'Incorrect end time' if start_time > end_time
    end
end

如果end_time或start_time为Nil，我有关于Nil的错误。我怎么样？如果以前的验证是正确的，如何执行time_comparison验证？

Answer 1

class TimeCorrection < ActiveRecord::Base
    validates :start_time, :end_time, :value, presence: true

    validate :time_comparison

    def time_comparison
        errors[:base] << 'Incorrect end time' if start_time && end_time && start_time > end_time
    end
end

Answer 2

我想，你必须检查开始和结束时间是否为零：

def time_comparison
    errors[:base] << 'Incorrect end time' if start_time && end_time && start_time > end_time
end

未定义的方法`＆gt;' for nil：自定义验证中的NilClass

2 个答案: