Mongodb:如何选择数组只包含特定字段的对象？

Question

我有两个对象:

{
        "_id" : ObjectId("54be5f5528c13bfc3409e8c2"),
        "name" : "Antonio",
        "lastname" : "de Cabezón",
        "by" : 1510,
        "dy" : 1566,
        "country" : "spain",
        "genre" : [
                "classical",
                "baroque"
        ]
}
{
        "_id" : ObjectId("54be5f5528c13bfc3409e8c1"),
        "name" : "Guillaume-Antoine",
        "lastname" : "Calvière",
        "by" : 1695,
        "dy" : 1755,
        "country" : "france",
        "genre" : [
                "baroque"
        ]
}

当我执行db.currentdb.find({genre:'baroque'})时,它也返回第一个对象.

我想只获取类型只是"巴洛克"的对象.这样做的正确方法是什么？

Answer 1

你可以试试

db.currentdb.find({genre: ['baroque']})

另外,请查看文档:

https://docs.mongodb.org/manual/reference/method/db.collection.find/