Question

我们假设这是我的数据：

{
"_id" : ObjectId("52892936b996cc760d000002"),
"created_at" : ISODate("2013-11-17T20:38:14.248Z"),
"name" : "Two",
"subcategories" : [
    {
        "subcategory" : "Alpha",
        "products" : [
            {
                "name" : "Product 5",
                "primary_price" : "2",
                "secondary_price" : "3",
                "created_at" : "Sun Nov 17 2013 20:39:20 GMT+0000 (GMT)"
            },
            {
                "name" : "Product 7",
                "primary_price" : "2",
                "secondary_price" : "3",
                "created_at" : "Sun Nov 17 2013 20:39:31 GMT+0000 (GMT)"
            }
        ]
    },
    {
        "subcategory" : "Bravo",
        "products" : [
            {
                "name" : "Product 6",
                "primary_price" : "2",
                "secondary_price" : "3",
                "created_at" : "Sun Nov 17 2013 20:39:26 GMT+0000 (GMT)"
            },
            {
                "name" : "Product 8",
                "primary_price" : "2",
                "secondary_price" : "3",
                "created_at" : "Sun Nov 17 2013 20:39:38 GMT+0000 (GMT)"
            },
            {
                "name" : "Apple",
                "primary_price" : "5",
                "secondary_price" : "13",
                "created_at" : "Sat Nov 23 2013 12:00:18 GMT+0000 (GMT)"
            },
            {
                "name" : "Lemon",
                "primary_price" : "9",
                "secondary_price" : "13",
                "created_at" : "Sat Nov 23 2013 12:00:32 GMT+0000 (GMT)"
            }
        ]
    }
]

}

我想删除“产品5”如何使用mongo进行操作（希望无需循环和/或进行任何数据转换？

我尝试过这里描述的方法：how to delete a specific object from array object in MongoDB

此处Deleting a single object from an array of objects in MongoDB

和Mongodb update operation inside sub array

我假设它不起作用的原因是因为我的对象是双嵌套的。我一直试图找到一个解决方案，我提出的涉及数据操作，我宁愿避免。

非常感谢帮助/建议。

Answer 1

您链接的第一个问题基本上是同一个问题。我不确定你尝试了什么，但是这会起作用（在shell中）：

db.test.update(
    {
        "_id" : ObjectId("52892936b996cc760d000002"), 
        'subcategories.subcategory': 'Alpha'
    }, 
    {$pull: {'subcategories.$.products': {name: 'Product 5'}}})

查询对象通过subcategory运算符标识要$pull products上的$元素。

如何使用mongodb删除数组内的对象内部的对象内部

1 个答案: