Firestore：客户和发票，如何建模

Question

我具有以下架构，但不确定如何在Firestore中对其进行建模。

我将有客户和发票。客户“有”发票。我需要能够执行以下两个查询：

• 显示客户的发票
• 更新系统中的所有发票（将布尔属性从true更改为false）。

对此建模的正确方法是什么？通过收集具有发票子集的客户来满足第一个查询。但是第二张帐单是否包含所有帐单，是令人满意的？

任何有经验的帮助表示赞赏

谢谢

Answer 1

I have another recommendation which involves you to create two top level collections like this:

Firestore-root
   |
   --- users (collection)
   |     |
   |     --- userId (documents)
   |          |
   |          --- //user details
   |
   --- invoices (collection)
         |
         --- invoiceId (documents)
              |
              --- yourBooleanProperty: true
              |
              --- userId: true

As you can see, the simplest way to achieve this, is to have a single collection named invoices that can hold as documents all the invoices in your database. Because a single invoice can belong only to a single user, you can have the userId as a property. To get all the invoices that correspond to a specific user, I recommend you to use the following query:

FirebaseFirestore rootRef = FirebaseFirestore.getInstance();
Query query = rootRef.collection("invoices").whereEqualTo(userId, true);

And if you want to change the boolean property of all invoices from true to false at once, simply use the following query:

Query query = rootRef.collection("invoices").whereEqualTo(yourBooleanProperty, true);