django2.0 + reverse lookup throw exception handling - Code World

django2.0 + reverse lookup throw exception handling

Others 2019-10-10 16:22:45 views: null

A. Error Messages

AttributeError: 'RelatedManager' object has no attribute 'lrc'
#其中RelatedManager为关键字

II. The reverse lookup field

obj.lrc_set.lrc
#语法没有问题
#然后我打印obj.lrc_set发现他是RelatedManager对象而不是我想要的lrc对象
#所有我查了一堆文献没找到方法,然后我就尝试.first()就解决了

III. Exception Handling

obj.lrc_set.first().lrc
#可能是2.0有点区别

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Origin www.cnblogs.com/pythonywy/p/11647210.html

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