Question

{
    id: 1,
    name: "venkat",
    description: "Description",
    address: "chennai",
    pinCode: "600100",
    authenticationCode: "123",
    authenticated: false,
    deleted: false,
    Location: [
        {
            name: "foo",
            description: "LocationDecription",
            parent: "parent",
            UserAccess: [
                {
                    loginName: "paklon",
                    role: "role"
                }
            ]
        }
    ]
}

我需要更新条件匹配的role:"admin"，例如id: 1，Location的数组name: "foo"和Location嵌套数组"UserAccess.loginName": "paklon"和然后更新角色。

Answer 1

根据上述描述作为解决方案，请尝试在MongoDB shell中执行以下更新操作

db.collection.update({
    "id": 1,
    "Location": {
        $elemMatch: {
            "name": "foo",
            "UserAccess": {
                $elemMatch: {
                    "loginName": "paklon"
                }
            }
        }
    }
}, {
    $set: {
        "Location.$.UserAccess.0.role": "admin"
    }
})

Answer 2

以下查询应该有效：

db.collection.update(
    {"id": 1, "Location.name": "foo", "Location.UserAccess.loginName": "paklon"}, 
    {$set: {"Location.0.UserAccess.0.role": "admin"}}
)

要更新数组中的特定元素，您需要使用positional operator“$”实际上是第一个元素的占位符。因此它可以替换为“0”，并且因为它允许在查询中仅使用“$”一次，所以在任何情况下都必须在查询结尾处使用“0”。

另请查看相应的mongodb documentation

使用多个条件更新嵌套文档

2 个答案: