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查找详情数据问题
我看大佬查找资讯详情的数据库 是用云函数的 where API� 根据字段来查找，但是这样有一个问题，就是返回的结果是一个array，读取的时候有点不方便。
然后我现在就是使用的 .doc() 这个API 根据字段来查找详情数据。
但是我现在用 .doc() 遇到的问题：
1、只能根据数据库自动生成的 _id来进行查找, 不能根据自己创建的索引字段来进行查找。比如我在集合创建来一个 索引字段是 new_id， 然后在云函数调用 .doc('new_id')，就会一直报错查不到。
报错错误：
errMsg: document.get:fail document with _id 10002 does not exist; at document.get api; ; at cloud.callFunction api;
大佬有好的解决方案吗
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