Firestore云文档中对象和键的动态更新

Question

我正在更新一个包含多个对象的firestore文档。下面是文档结构：

2019: { // each key is month and value is number of projects submitted each month
    0: 12, 
    1: 15, 
    2: 5, 
    3: 5, 
    4: 200, 
    5: 15, 
    6: 12, 
    7: 15,
    8: 215,
    9: 15, 
    10: 12, 
    11: 15,
},
2020: {
    0: 3, 
    1: 100, 
    2: 5, 
    3: 75, 
    4: 200, 
    5: 15, 
    6: 12, 
    7: 15,
    8: 215,
    9: 15, 
    10: 13, 
    11: 200,
}

我可以手动更新特定值，如下所示：

2019.2: admin.firestore.FieldValue.increment(1) //changing the value of March 2019

我不能动态地改变它。我试着这样做：

var year = new Date().getFullYear().toString()
var month = new Date().getMonth().toString()


[year].[month]: admin.firestore.FieldValue.increment(1)

我尝试使用[]s和s，但它们都不起作用。下面是完整的函数：

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.projectAdded = functions.firestore.document('projects/{projectId}').onCreate(doc => {

    const project = doc.data();
    // Get a new write batch
    var batch = admin.firestore().batch();

    // Update count of 'all' Category doc in categories
    var allCat = admin.firestore().collection("categories").doc("all");
    batch.update(allCat, {
        All: admin.firestore.FieldValue.increment(1),
        [project.category]: admin.firestore.FieldValue.increment(1)
    });

    // Update count of 'user Category' doc in categories
    var userCat = admin.firestore().collection("categories").doc(project.authorId);
    batch.update(userCat, {
        All: admin.firestore.FieldValue.increment(1),
        [project.category]: admin.firestore.FieldValue.increment(1)
    });

    // Update count of 'user projects' doc in Users
    var userQ = admin.firestore().collection("users").doc(project.authorId);
    var year = new Date().getFullYear().toString()
    var month = new Date().getMonth().toString()
    batch.update(userQ, {
        projectsAdded: admin.firestore.FieldValue.increment(1),
        [year]: admin.firestore.FieldValue.increment(1),
        `${year}.${month}`: admin.firestore.FieldValue.increment(1),       
    });

    return batch.commit().then(function () {
        console.log("Adding categories")
    })
        .then(doc => console.log('Categories Added'));

});

有没有什么方法可以让我同时动态访问对象和它的键。

Answer 1

要解决这个问题，首先用您期望的最终值创建一个变量，然后按如下所示进行赋值：

{[variable]: admin.firestore.FieldValue.increment (1)}

这样，您将不会传递文字字符串，而是传递变量的值作为对象的键。