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怎样给 mongodb 整个数组作为一个唯一项建立唯一索引啊？

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  •   sujin190 · Oct 21, 2014 · 3775 views
    This topic created in 4307 days ago, the information mentioned may be changed or developed.
    怎样给mongodb整个数组作为一个唯一项建立唯一索引啊？默认给数组建立唯一索引是给数组中得每一项建立唯一索引，这样只要有相同的数据第二项就插不进去了啊？求解
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