云Firestore深入与subcollection

问题描述

假设我们有一个名为todos的根集合。

这个集合中的每个文档都有：

ol>

title ：String

名为的子集合todo_items

子集合 todo_items 中的每个文档都有

title ：String

完成

$ b

我知道在Cloud Firestore中的查询默认很浅，有没有一种方法来查询 todos 并自动获得包含子集合 todo_items 的结果？

换句话说，我如何使下列查询包含 todo_items 子集合？

onSnapshot（（snapshot）=> {
snapshot.docChanges.forEach（（change）=> {$ b $（$ t pre $ p $ b // ...
}）;
}）;

解决方案

不支持这种类型的查询是我们未来可能考虑的事情。

Let's say we have a root collection named 'todos'.

Every document in this collection has:

1. title: String
2. subcollection named todo_items

Every document in the subcollection todo_items has

1. title: String
2. completed: Boolean

I know that querying in Cloud Firestore is shallow by default, which is great, but is there a way to query the todos and get results that include the subcollection todo_items automatically?

In other words, how do I make the following query include the todo_items subcollection?

db.collection('todos').onSnapshot((snapshot) => {
  snapshot.docChanges.forEach((change) => {
    // ...
  });
});

解决方案

This type of query isn't supported, although it is something we may consider in the future.

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