javascript - 通过引用修改 Javascript 对象

Question

我正在尝试为 mongoDB 的 aggregate 框架创建一个复杂的查询。它需要一个以编程方式添加 $and 和 $or 的组件。

这是我对象的当前结构:

const inputObject = {
    "details.blackBottom": { "in": ["A","B","C","D"] },
    "details.blackTop": { "in": ["L","M"] },
    "details.redBottom": { "in": ["A","B","C","D"] },
    "details.redTop": { "in": ["L","M"] },
    "details.greenBottom": { "in": ["A","B","C","D"] },
    "details.greenTop": { "in": ["L","M"] }
}

但是，为了使该对象有用，我需要重新表述它，以便它同时使用 $or 和 $and。最终输出应如下所示:

const outputObject = {
    "$and": [
        {
            "$or" : [
                {"details.blackBottom": { "in": ["A","B","C","D"] }},
                {"details.redBottom": { "in": ["A","B","C","D"] }},
                {"details.greenBottom": { "in": ["A","B","C","D"] }}
            ]
        },
        {
            "$or" : [
                {"details.blackTop": { "in": ["L","M"] } },
                {"details.redTop": { "in": ["L","M"] } },
                {"details.greenTop": { "in": ["L","M"] } }
            ]
        }
    ]
}

请注意，$or 组件按 Bottom 和 Top 分组。

如何将 inputObject 转换为所需的 outputObject？

Answer 1

您可以结合使用 filter 和 map 方法:

const inputObject = {
    "details.blackBottom": { "in": ["A","B","C","D"] },
    "details.blackTop": { "in": ["L","M"] },
    "details.redBottom": { "in": ["A","B","C","D"] },
    "details.redTop": { "in": ["L","M"] },
    "details.greenBottom": { "in": ["A","B","C","D"] },
    "details.greenTop": { "in": ["L","M"] }
}

const outputObject = {
    $and: ["Bottom", "Top"].map( side => ({
        $or: Object.keys(inputObject)
                   .filter( key => key.endsWith(side) )
                   .map( key => ({ [key]: inputObject[key] }) )
    }) )
};

console.log(outputObject);

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