更新不带ID的Cloud Firestore文档 [英] update cloud firestore document without id

问题描述

我的Cloud Firestore看起来像这样:

My Cloud Firestore looks like this:

users
  ├────random_id_1───{name, email, ...}
  ├────random_id_2───{name, email, ...}
 ...
  └────random_id_n───{name, email, ...}

我要更新 users 的文档，因为我有一个唯一的标识符，该标识符不是该文档的随机ID(例如，名称是唯一的，并且我想使用它作为标识符).

I want to update a document of users given I have an unique identifier for it that is NOT the random id of the document (suppose, for example, the name is unique and I want to use it as identifier).

如何更新按字段标识的文档?

How can I update a document identifying it by a field of it?

推荐答案

Firestore只能更新其知道完整引用的文档，该文档需要文档ID.在当前结构上，您将必须运行查询以找到文档.像这样:

Firestore can only update documents for which it knows the complete reference, which requires the document ID. On your current structure, you will have to run a query to find the document. So something like:

firebase.firestore().collection("users")
  .where("name", "==", "Daniel")
  .get(function(querySnapshot) {
    querySnapshot.forEach(function(document) {
     document.ref.update({ ... }); 
    });
  });

如果您还有另一个唯一的属性，我总是建议您使用该属性作为文档的ID.这样，您将自动保证每个用户只能存在一个文档，并且省去了查询来查找文档的麻烦.

If you have another attribute that is unique, I'd always recommend using that as the IDs for the documents. That way you're automatically guaranteed that only one document per user can exist, and you save yourself having to do a query to find the document.

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