更新Firestore中对象的字段? [英] Update a field in an object in Firestore?

问题描述

这是文档中提供的示例，用于更新Firebase中嵌套对象内的字段.

This is the example provided in the documentation to update a field within a nested object in firebase.

var frankDocRef = db.collection("users").doc("frank");
frankDocRef.set({
name: "Frank",
favorites: { food: "Pizza", color: "Blue", subject: "recess" },
age: 12
});

// To update age and favorite color:
db.collection("users").doc("frank").update({
"age": 13,
"favorites.color": "Red"
})
.then(function() {
console.log("Document successfully updated!");
});

我不想添加收藏夹，而是想添加到收藏夹中，以便有人向我指出如何执行此操作的正确方向.

Instead of updating the favourites, I want to add to favourites would someone point me in the right direction on how to do this.

假设我要

firebase: "Help"
the the resulting favourites object should be
favorites: { food: "Pizza", color: "Blue", subject: "recess", firebase: "Help" },

我将set与点操作一起使用，但它会覆盖所有内容.

I used set with the dot operation but it overrides everything instead.

推荐答案

要将条目添加到集合(JavaScript对象)中，请使用DocumentReference.update:

To add an entry to a set (a Javascript Object), use DocumentReference.update:

db.collection("users").doc("frank").update({
  "favorites.firebase": "Help")}
})

将导致

favorites: { food: "Pizza", color: "Blue", subject: "recess", firebase: "Help" }

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