对象的嵌套数组删除 mongoDB 中的特定元素

Question

这是我的数据，我只想删除这个特定对象：
感谢提前如何从嵌套数组元素中删除特定对象

{ “_id”：ObjectId（“5397eb925d2664177b0fc5a6”）， "answer" : "项目问题 1 - 答案 1", “isCorrectAnswer”：真 }

输入数据：

   {
        "_id" : ObjectId("5397e4b75c4c9bf0509709ab"),
        "name" : "Item Name",
        "description" : "Item Description",
        "questions" : [
            {
                "_id" : ObjectId("5397eb925d2664177b0fc5a5"),
                "question" : "Item Question 1",
                "answers" : [
                        {
                            "_id" : ObjectId("5397eb925d2664177b0fc5a6"),
                            "answer" : "Item Question 1 - Answer 1",
                            "isCorrectAnswer" : true
                        },
                        {
                            "_id" : ObjectId("5397eb925d2664177b0fc5a7"),
                            "answer" : "Item Question 1 - Answer 2",
                            "isCorrectAnswer" : false
                        }
                    
                    ]
            },
            {
                "_id" : ObjectId("5397eb925d2664177b0fc5a9"),
                "question" : "Item Question 2",
                "answers" : [
                    {
                        "_id" : ObjectId("5397eb925d2664177b0fc5aa"),
                        "answer" : "Item Question 2 - Answer 1",
                        "isCorrectAnswer" : false
                    },
                    {
                        "_id" : ObjectId("5397eb925d2664177b0fc5ab")
                        "answer" : "Item Question 2 - Answer 2",
                        "isCorrectAnswer" : true
                    }
                ]
            }
        ]
    }

expected output:
   {
        "_id" : ObjectId("5397e4b75c4c9bf0509709ab"),
        "name" : "Item Name",
        "description" : "Item Description",
        "questions" : [
            {
                "_id" : ObjectId("5397eb925d2664177b0fc5a5"),
                "question" : "Item Question 1",
                "answers" : [
                       
                        {
                            "_id" : ObjectId("5397eb925d2664177b0fc5a7"),
                            "answer" : "Item Question 1 - Answer 2",
                            "isCorrectAnswer" : false
                        }
                    ]
            },
            {
                "_id" : ObjectId("5397eb925d2664177b0fc5a9"),
                "question" : "Item Question 2",
                "answers" : [
                    {
                        "_id" : ObjectId("5397eb925d2664177b0fc5aa"),
                        "answer" : "Item Question 2 - Answer 1",
                        "isCorrectAnswer" : false
                    },
                    {
                        "_id" : ObjectId("5397eb925d2664177b0fc5ab")
                        "answer" : "Item Question 2 - Answer 2",
                        "isCorrectAnswer" : true
                    }
                ]
            }
        ]
    }

感谢提前如何从嵌套数组元素中删除特定对象

Answer 1

Solution in Mongoplayground。试试这个：

db.collection.updateOne(
    { "_id": ObjectId("5397e4b75c4c9bf0509709ab") },
    {
        $pull: {
            "questions.$[].answers": {
                "_id": ObjectId("5397eb925d2664177b0fc5a6")
            }
        }
    }
);

输出：

{
    "_id" : ObjectId("5397e4b75c4c9bf0509709ab"),
    "name" : "Item Name",
    "description" : "Item Description",
    "questions" : [
        {
            "_id" : ObjectId("5397eb925d2664177b0fc5a5"),
            "question" : "Item Question 1",
            "answers" : [
                {
                    "_id" : ObjectId("5397eb925d2664177b0fc5a7"),
                    "answer" : "Item Question 1 - Answer 2",
                    "isCorrectAnswer" : false
                }
            ]
        },
        {
            "_id" : ObjectId("5397eb925d2664177b0fc5a9"),
            "question" : "Item Question 2",
            "answers" : [
                {
                    "_id" : ObjectId("5397eb925d2664177b0fc5aa"),
                    "answer" : "Item Question 2 - Answer 1",
                    "isCorrectAnswer" : false
                },
                {
                    "_id" : ObjectId("5397eb925d2664177b0fc5ab"),
                    "answer" : "Item Question 2 - Answer 2",
                    "isCorrectAnswer" : true
                }
            ]
        }
    ]
}