具有以下文档：

{ 
"_id" : ObjectId("xxx"),"seller" : {
    "phone" : {
        "number" : "xx"
    },"nickname" : "xx"
},"shipping" : {
    "id" : xx
},"id" : yyy,"order_items" : {
    "item" : {
        "title" : "xxxyy"
    },"quantity" : 1
}}

我需要转换为该输出

{ 
"_id" : ObjectId("xxx"),"seller.phone.number" : "xx","seller.nickname" : "xx","shipping.id" : "xx","order_items.item.title" :"xxxyy","order_items.quantity" : 1
}

如您所见，我需要做的是将文档展平到单个级别 我正在尝试以下代码，但mi输出静止图像会被嵌套

db.getcollection("collection").aggregate(
    [
        { 
            "$unwind" : { 
                "path" : "$order_items"
            }
        },{ 
            "$project" : { 
                "seller.phone.number" : 1.0,"seller.nickname" : 1.0,"shipping.id" : 1.0,"id" : 1.0,"order_items.item.title" : 1.0,"order_items.quantity" : 1.0
            }
        }
    ],{ 
        "allowDiskUse" : false
    }
);

我开始与mongodb和studio3t合作，将不胜感激 问候