Mongo-转到如何使用 arrayFilter 在 "array of objects inside array of objects" 中查找元素

Mongo-go how to use arrayFilter to find elem in "array of objects inside array of objects"

让我们想象一个 JSON 像:

"user": {
  "id": "1234",
  ...some fields,
  "achievements": [
    {
      "scope": "life achievements",
      "list": [
        {"_id": 1, "title": "some text", "gotAt": "some date"},
        {"_id": 2, "title": "some other text", "gotAt": "some date"}
      ]
    },
    {
      "scope": "sport achievements",
      "list": [
        {"_id": 1, "title": "sport", "gotAt": "some date"},
        {"_id": 2, "title": "some other sport", "gotAt": "some date"}
      ]
    },
    {
      "scope": "academic achievements",
      "list": [
        {"_id": 1, "title": "some text", "gotAt": "some date"},
        {"_id": 2, "title": "some other text", "gotAt": "some date"}
      ]
    },
  ]
}

我需要使用 mongoDb 和 Golang 驱动程序 Mongo 更新第一个人生成就(id 为 1)- 去做吧

问题出在嵌套级别。我可以通过 $ mongoDb 运算符获得一些数组元素,但在这里我需要通过 activity 范围(生活、运动、学术等)和成就的 _id 字段来识别每个用户成就。所以我需要在其他对象数组中的对象数组中进行搜索。

我就是这么干的(反正不管用)

doc := coll.FindOneAndUpdate(
        context.Background(),
        bson.D{
            {"_id", "1234"},
            {"achievements.scope", "life achievements"},
            {"achievements.list._id", 1},
        },
        bson.D{
            {"$set", bson.D{
                {"achievements.$.list.$[elem].title", "some new test"},
            }},
        },
        options.FindOneAndUpdate().SetArrayFilters(options.ArrayFilters{
            Filters: append(make([]interface{}, 0), bson.D{
                {"elem", bson.D{
                    {"achievements.list._id", 1},
                }},
            }),
        }).SetReturnDocument(1),
    )

我希望此查询仅更新 "id" 和 "scope" 字段指定的一个元素。可能是我不正确地使用了 arrayFilters,也可能是我错误地设置了 FindOneAndUpdate 函数的参数。现在它不会抛出任何错误,也不会更新文档。请帮助我

使用包 go.mongodb.org/mongo-driver/mongo 你可以这样做:

coll.FindOneAndUpdate(
    context.Background(),
    bson.D{
        {"id", "1234"},
        {"achievements.scope", "life achievements"},
        {"achievements.list._id", 1},
    },
    bson.M{"$set": bson.M{"achievements.$.list.$[elem].title": "some new test"}},
    options.FindOneAndUpdate().SetArrayFilters(options.ArrayFilters{
        Filters: []interface{}{bson.M{"elem._id": 1}},
    }),
)

“翻译”为 shell:

db.user.findOneAndUpdate(
  {"id": "1234","achievements.scope": "life achievements","achievements.list._id": 1},
  {$set: {"achievements.$.list.$[elem].title": "some new test"}},
  {arrayFilters: [{"elem._id": 1}]}
)

因此,在@owlwalks 的帮助下,我们找到了决定:

doc := coll.FindOneAndUpdate(
        context.Background(),
        bson.D{
            {"_id", "1234"},
            {"achievements.scope", "life achievements"},
        },
        bson.D{
            {"$set", bson.D{
                {"achievements.$.list.$[elem].title", "some new text"},
            }},
        },
        options.FindOneAndUpdate().SetArrayFilters(options.ArrayFilters{
            Filters: []interface{}{bson.D{
                    {"elem._id", 1},
                }},
        }).SetReturnDocument(1),
    )