更新 firestore 中的文档 [英] Update a document in firestore

问题描述

我想更新 Firebase 中的文档.问题是你只能更新一个特定的字段?

I would like the update a document in Firebase. The problem is that you can only update a specific field?

我想做这样的事情:

fs.collection("users").document(user.id).update(user)

问题在于 Kotlin 强制将字段放入更新中，如下所示:

The problem is that Kotlin forces to put a field in update, like this:

fs.collection("users").document(user.id).update("firstname", user)

但我不想那样，我想用我的模型而不是字段来更新整个文档.

But I don't want that, I want to update the whole document with my model not a field.

推荐答案

使用以下代码行:

fs.collection("users").document(user.id).update("firstname", user)

您将只能更新一个属性.如果要更新多个属性，请使用以下代码行:

You'll be able to update only a single property. If you want to update multiple properties, please use the following lines of code:

fs.collection("users").document(user.id).update("firstname", "John",
                                                "lastname", "Smith",
                                                "age", 25)

如果您想使用 User 类的对象更新文档，请使用 set() 方法而不是 update()>，就像下面这行代码:

If you want to update a document using an object of your User class, please use the set() method instead of update(), like in the following line of code:

fs.collection("users").document(user.id).set(user)

您还可以使用 Map 来更新文档，如我在以下帖子中的回答中所述:

You can also use a Map to update a document, as explained in my answer from the following post:

• Firestore firebase Android 搜索和更新查询

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