Javascript 无法从Algolia中删除对象

我有一个post对象，最初是有人创建的，然后这将触发一个Firebase函数，然后将其添加到Algolia以便稍后查询。当用户删除帖子时，从Algolia中删除对象时，我遇到了一些问题。该功能在Firebase中被触发，但它正在“更新”帖子，而不是将其删除

以下是Firebase功能控制台的日志：

onPostWrite: Function execution took 79 ms, finished with status: 'ok'
onPostWrite: Function execution started
onPostWrite: Updated post -Lb3lcmWn1iXAdnbFDmo

以下是为函数执行的代码：

exports.onPostWrite = functions.database.ref('/posts/{postId}').onWrite((snapshot, context) => {
  const index = client.initIndex(ALGOLIA_INDEX_POSTS);
  //When the data is first created...
  if (snapshot.before.exists()) {
    const post = snapshot.before.val();

    post.objectID = context.params.postId;

    console.log('Updated post ', post.objectID);
    return index.saveObject(post);
  }
  //When data has been deleted...
  if (!snapshot.after.exists()) {
    const post = snapshot.before.val();

    post.objectID = context.params.postId;

    console.log('Deleted post ', post.objectID);
    return index.deleteObject(post.objectID);
  }

  if (!snapshot.before.exists()) {
    const post = snapshot.after.val();

    post.objectID = context.params.postId;

    console.log('Created post ', post.objectID);
    return index.saveObject(post);
  }
});

正如您所知，它只执行“Update”命令，而不是create或delete命令

---

我想这可能与我的IF语句有关，但我不确定。如果有任何帮助，我们将不胜感激。

您需要切换

if

语句的顺序

// Called onUpdate, a snapshot exists before the update and exists after the update
// Called onDeletion, a snapshot exists before the update and doesn't exist after the update
if (snapshot.before.exists()) {

// Called onDeletion, nothing exists after operation
if (!snapshot.after.exists()) {

// Called onCreate. Nothing existed `before`, but it does now
if (!snapshot.before.exists()) {

因为您在每个块中返回，所以即使删除第一个块，执行也会在第一个块之后停止。我想如果你交换前两个街区，它会像预期的那样工作：

// Called onDelete, nothing exists after operation
if (!snapshot.after.exists()) {

// Called onUpdate, a snapshot exists before the update and exists after the update
// Called onDelete, a snapshot exists before the update and doesn't exist after the update
// Since you've moved a "better" `onDelete` above this, this function will now only be called for onUpdate 
if (snapshot.before.exists()) {

// Called onCreate. Nothing existed `before`, but it does now
if (!snapshot.before.exists()) { 

注意：您实际上不需要最后一条

if

语句，因为前两条语句将捕获

delete

和

update

操作，最后一条是代码可以采用的唯一其他路径。以下是我对这一切的看法：

exports.onPostWrite = functions
  .database
  .ref('/posts/{postId}')
  .onWrite((snapshot, context) => {
    const index = client.initIndex(ALGOLIA_INDEX_POSTS);

    // no snapshot.before.exists(), post has been created
    if (!snapshot.before.exists()) {
      const post = snapshot.after.val();
      post.objectID = context.params.postId;

      console.log('Creating post ', post.objectID);
      return index.saveObject(post);
    }

    const post = snapshot.before.val();
    post.objectID = context.params.postId;

    // no snapshot.after.exists(), post has been deleted
    if (!snapshot.after.exists()) {
      console.log('Deleting post ', post.objectID);
      return index.deleteObject(post.objectID);
    }

    // snapshot.before.exists() AND snapshot.after.exists(), post has been updated
    console.log('Updating post ', post.objectID);
    return index.saveObject(post);

  });

---

你能记录

index.deleteObject（post.objectID）吗？现在您正在记录
删除的帖子
，除了ID本身之外，它不会给您任何有用的遥测信息。另外，您使用哪种类型的API键来初始化索引？我无法记录这部分代码，因为函数从未达到该点。当我进入我的应用程序并删除帖子时，该功能的代码不会被触发。这就是我的问题。我也在使用Algolia admin API密钥。在这种情况下，问题似乎出在
上！snapshot.after.exists（）
我通过为创建、更新和删除部分创建三个单独的函数，实际上修复了整个问题。然而，这有点低效，我想找出这里出了什么问题。我来玩玩
！snapshot.after.exists（）
并查看其是否有效。是的，如果您找到答案，请告诉我们！