如何在 angularfire firestore 中删除整个文档集合

Question

我刚刚更改了我的代码，如下所示，它正在工作。 在 google cloud-firestore 中可以批量删除。

async deleteMembersOfGroup(clubId: string, groupId: string) {
    //path of the collection
    const path = "club/" + clubId + "/group/" + groupId + "/group-members";

//query snapshot
    const qry: firebase.firestore.QuerySnapshot = await this.afs.collection(path).ref.get();

    const batch = this.afs.firestore.batch();

//looping through docs in the collection to delete docs as a bulk operation
    qry.forEach(doc => {
      console.log('deleting....', doc.id);
      batch.delete(doc.ref);
    });

//finally commit
    batch.commit().then(res => console.log('committed batch.'))
    .catch(err => console.error('error committing batch.', err));
  }

Answer 1

文档说：

不建议从 Web 客户端删除 collections。

因此省略给出示例（尽管提供了 Node.js 示例）。

因此，您可以调整 Node.js 代码以在 JavaScript 中工作（尽管 Google 不建议这样做），或者您可以使用云 function 解决方案（如果您使用的是 Google 提供的云功能）。

使用 Callable Cloud 删除集合 Function

这是直接来自文档的云 function 代码：

云 FUNCTION 代码

/**
 * Initiate a recursive delete of documents at a given path.
 * 
 * The calling user must be authenticated and have the custom "admin" attribute
 * set to true on the auth token.
 * 
 * This delete is NOT an atomic operation and it's possible
 * that it may fail after only deleting some documents.
 * 
 * @param {string} data.path the document or collection path to delete.
 */
exports.recursiveDelete = functions
  .runWith({
    timeoutSeconds: 540,
    memory: '2GB'
  })
  .https.onCall(async (data, context) => {
    // Only allow admin users to execute this function.
    if (!(context.auth && context.auth.token && context.auth.token.admin)) {
      throw new functions.https.HttpsError(
        'permission-denied',
        'Must be an administrative user to initiate delete.'
      );
    }

    const path = data.path;
    console.log(
      `User ${context.auth.uid} has requested to delete path ${path}`
    );

    // Run a recursive delete on the given document or collection path.
    // The 'token' must be set in the functions config, and can be generated
    // at the command line by running 'firebase login:ci'.
    await firebase_tools.firestore
      .delete(path, {
        project: process.env.GCLOUD_PROJECT,
        recursive: true,
        force: true,
        token: functions.config().fb.token
      });

    return {
      path: path 
    };
  });

客户端代码

/**
 * Call the 'recursiveDelete' callable function with a path to initiate
 * a server-side delete.
 */
function deleteAtPath(path) {
    var deleteFn = firebase.functions().httpsCallable('recursiveDelete');
    deleteFn({ path: path })
        .then(function(result) {
            logMessage('Delete success: ' + JSON.stringify(result));
        })
        .catch(function(err) {
            logMessage('Delete failed, see console,');
            console.warn(err);
        });
}

一如既往，为什么 GCP 这么难！