选择嵌套数组对象并替换它

Question

我有一个数组(作为mongoDB查询的结果),有一些这样的元素:

{ 
    "_id": "ExxTDXJSwvRbLdtpg",
    "content": [
        {
            "content": "First paragraph", 
            "language":"en", 
            "timestamp":1483978498 
        },
        {
            "content": "Erster Abschnitt", 
            "language":"de", 
            "timestamp":1483978498 
        }
    ]
}

但是我需要为每个数据数组元素只获取一个内容字段,该字段应该由语言选择.所以结果应该是(假设选择英文内容):

{ 
    "_id": "ExxTDXJSwvRbLdtpg",
    "content": "First paragraph"
}

而不是获取所有内容数据......

我试着这样做find(c => c.language === 'en),但我不知道如何将它用于数据数组的所有元素.也许它也可以直接作为mongodb查询获取数据？

Answer 1

您可以迭代该数组并替换其中的值。

var array = [{ _id: "ExxTDXJSwvRbLdtpg", content: [{ content: "First paragraph", language: "en", timestamp: 1483978498 }, { content: "Erster Abschnitt", language: "de", timestamp: 1483978498 }] }];

array.forEach(a => a.content = a.content.find(c => c.language === 'en').content);

console.log(array);

带检查的版本content

var array = [{ _id: "ExxTDXJSwvRbLdtpg", content: [{ content: "First paragraph", language: "en", timestamp: 1483978498 }, { content: "Erster Abschnitt", language: "de", timestamp: 1483978498 }] }, { _id: "no_content" }, { _id: "no_english_translation", content: [{ content: "Premier lot", language: "fr", timestamp: 1483978498 }, { content: "Erster Abschnitt", language: "de", timestamp: 1483978498 }] }];

array.forEach(function (a) {
    var language;
    if (Array.isArray(a.content)) {
        language = a.content.find(c => c.language === 'en');
        if (language) {
            a.content = language.content;
        } else {
            delete a.content;
        }
    }
});

console.log(array);