Firestore onSnapshot的调用超出了模拟器的预期

Question

Firestore.collection（...）。onSnapshot被调用的次数比预期的多

我目前正在围绕针对模拟器运行的firestore代码编写测试（我尚未针对真实事物进行测试），并且快照的调用次数比我预期的要多得多。创建一个单一的“集合”将导致1个“添加”和2个“修改”，而第二个“集合”将修改数据将导致3个“修改的”文档更改。

这可能是设计使然，但我无法弄清楚为什么会这样。我希望每个更改最多2个修改。 1，具有hasPendingWrites：true，1具有hasPendingWrites：false。

监听一段数据的代码片段：

firestore.collection(teamWsPath).onSnapshot((snapshot) => {
          snapshot.docChanges().forEach((change) => {
            if (change.type === "added") {
              console.log('added');
              console.log(change.doc.metadata);
              onAdded(change.doc.data() as UserWorkspace);
            } else if (change.type === "removed") {
              onRemoved(change.doc.data() as UserWorkspace);
            } else if (change.type === "modified") {
              console.log('modified');
              console.log(change.doc.metadata);
              onModified(change.doc.data() as UserWorkspace);
            }
          })

创建/保存Firestore对象，然后再次保存它的测试代码。

it.only('listenToAllTeamWorkspaces should call onModified when a ws is modified', async () => {
    const wsData: FSWorkspaceData = new FSWorkspaceData(testDataAPI.getFirestore(), testDataAPI);

    let addedCount: number = 0;
    let removedCount: number = 0;
    let modifiedCount: number = 0;

    await wsData.listenToAllTeamWorkspaces(UserWorkspaceTestData.ws1.parentTeamId,
      (ws: UserWorkspace) => {
        addedCount++;
        expect(ws.name).to.equal(UserWorkspaceTestData.ws1.name);
      },
      (ws) => {
        removedCount++;
        expect.fail("Nothing should have been removed.")
      },
      (ws) => {
        modifiedCount++;
        expect(ws.name).to.equal(UserWorkspaceTestData.ws1.name);
      });
    await sleep(6000);

    console.log("--------------Create Workspace-----------");
    await wsData.saveTeamWorkspace(UserWorkspaceTestData.ws1);

    await sleep(6000);

    //Modified
    console.log("--------------Modify Workspace-----------");
    UserWorkspaceTestData.ws1.name = "Modified";
    await wsData.saveTeamWorkspace(UserWorkspaceTestData.ws1);

    await sleep(6000);

    expect(addedCount).to.equal(1);
    expect(modifiedCount).to.equal(4); //Modified called on 1. Create local, 2. Create remote, 3. Modified Local 4. modified remote
    wsData.stopListeningToTeamWorkspaces(UserWorkspaceTestData.ws1.parentTeamId);
  });

它产生输出：

--------------Create Workspace-----------
added
SnapshotMetadata { hasPendingWrites: true, fromCache: false }
modified
SnapshotMetadata { hasPendingWrites: true, fromCache: false }
modified
SnapshotMetadata { hasPendingWrites: false, fromCache: false }
--------------Modify Workspace-----------
modified
SnapshotMetadata { hasPendingWrites: true, fromCache: false }
modified
SnapshotMetadata { hasPendingWrites: true, fromCache: false }
modified
SnapshotMetadata { hasPendingWrites: false, fromCache: false }