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接下来需要为现有的模型增加自然键的定义，并且尝试增加”选择导出的列“的功能。 有可能需要把导出逻辑放到另一个页面上。
考虑到我们定义natural key只要是为了让导出的excel中外键处理更美观，没有全部加natural_key。 后面如果遇到有导出的是id的情况，可以再补充。
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简易的导出功能。
使用了
django.core.serializers模块里提供的转化为字符串功能，并将序列化得到的JSON转化为Excel文件，返回给用户。Excel文件中每列的名称来自模型定义中每个field的verbose_name.Django的序列化默认使用主键作为外键的输出。为了提高可读性，利用了Django的natural key功能，让序列化时可以指定外键的表现形式。例如，通过设置奖池
Pool模型的natural key为奖池名称，在导出奖池记录PoolRecord时，其中含有的Poolforeign key列将包括奖池名称字符串，而不是对应Pool对象的id。本PR中包含了一些类的natural key定义，后续可以根据实际使用情况进行维护。导出功能在设计时只考虑了“导出”，没有考虑从获得的Excel文件恢复数据库对象，所以natural key并不一定能唯一确定对象，没有完全实现Django的要求，这点需要注意。