FIRESTORE-在文档中插入子集合

Question

我的FiRecovery数据库中有一个名为Reports的集合，我已经在其中添加了文档。但我现在的问题是我想在报表中添加一个带有子集合的文档，有什么想法吗？

public CollectionReference Ref = firestore.collection("Reports");
Reports reports = new Reports(date, cash, total, discount, quantity, sum, employee);
Ref.add(reports);

Answer 1

报告不能是文档，只能是集合。假设您有一个如下所示的数据库结构：

Firestore-root
    |
    --- Reports (collection)
          |
          --- reportId (document)
                |
                --- // report details

要在reportId文档下添加一个新集合，该集合包含其他文档，请使用以下代码行：

FirebaseFirestore rootRef = FirebaseFirestore.getInstance();
CollectionReference ref = rootRef
    .collection("Reports").document(reportId)
    .collection("NewCollection").document(newCollectionId);
ref.add(reports);

你的新结构会是这样的：

Firestore-root
    |
    --- Reports (collection)
          |
          --- reportId (document)
                |
                --- // report details
                |
                --- NewCollection (collection)
                       |
                       --- newCollectionId (document)
                              |
                              ---//  newCollectionId details