如何检查只有一个特定字段的用户使用Firestore规则进行了更新? [英] How to check if there is only one specific field who is updated with Firestore rules?

问题描述

应用程序端，我有以下代码:

Application side, I have this code :

static func markTaskAsCompleted(field: String, task: Task) -> Promise<Bool> {
    return Promise<Bool> { seal in
        FirestoreHandler.shared.db.collection("tasks").document(task.id!).updateData([
            "\(field)": true
        ], completion: { (err) in
            seal.resolve(err != nil ? false : true, err)
        })
    }
}

我将更新单个字段，在这种情况下为helper_completed.这是安全规则:

I update a single field, helper_completed in this case. Here are the security rules :

match /tasks/{task_id} {
  ...
  allow update: if (...) || isValidTaskUpdate();
  ...
}

function isValidTaskUpdate() {
  return currentUser().uid == existingData().assigned.user_id &&
         incomingData().keys().size() == 1 &&
         'helper_completed' in incomingData();
}

function incomingData() {
  return request.resource.data;
}

最后一个检查'helper_completed' in incomingData()始终使用先前的应用程序代码返回false.

The last check 'helper_completed' in incomingData() always return false with the previous application code.

我也尝试过:

 'helper_completed' in incomingData().keys();
  incomingData().hasAny('helper_completed');

那么，如何检查我的更新请求中是否仅更新了一个特定字段?

So, how can I check if there is only one specific field updated in my update request ?

我已经检查了: Firestore安全规则-如何检查字段是否已被修改?

推荐答案

要检查正在更新哪些字段，请使用

To check what fields are being updated, use request.writeFields. In your case this should be:

"helper_completed" in request.writeFields && request.writeFields.size() == 1

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