firestore-在哈希图中的字段中添加元素 [英] firestore -- Add element in a field in hashmap

问题描述

以上是集合网络"的结构.要做的是在用户"字段中添加另一个元素.这是一个 HashMap .我要实现的是Key = [e-mail]及其值{displayName:"Anirudh Kumar"，"role":"admin"}.

Above is the structure of collection "networks". What is want to do is add another element in "users" field. It's a HashMap. I want to achieve is Key= [e-mail] and its values {displayName: "Anirudh Kumar", "role":"admin"}.

[e-mail]:"Anirudh Kumar"角色:管理员"

[e-mail] displayName: "Anirudh Kumar" role: "admin"

我尝试了几件事，但是似乎没有用.

I have tried few things but it doesn't seems to work.

第一个选项

        Map<String, Network.NetworkUser> users = new HashMap<>();
        users.put(email, networkUser);

       db.collection("networks").document("id")
          .update("users",FieldValue.arrayUnion(users));

第二个选项

       db.collection("networks").document(userNetwork.getNetworkUid())
                                .set(users,SetOptions.merge());

第三个选项

                            db.collection("networks").document(userNetwork.getNetworkUid())
                                .update("users."+email,networkUser);

第三个选项使我更接近答案，但是由于电子邮件中的点[.]会创建另一行，请让我知道是否可以避免这种情况.

3rd option takes me closer to answer, but because of dot [.] in an email it creates another row, let me know if somehow this can be avoided.

如果有人可以帮助我如何实现期望的目标，将不胜感激.谢谢.

If anyone can assist me how can I achieve the desired goal, it would be appreciated. Thanks.

推荐答案

您的尝试均无济于事，因为您正尝试使用 Map 来更新文档，其中该值是类型为<的对象code> Network.NetworkUser ，这是不可能的，因为无法将对象映射到 HashMap .

None of your attempts work because you are trying to update a document using a Map in which the value is an object of type Network.NetworkUser and this is not possible, because there is no way you can map that object to a HashMap.

什么是 users 属性?实际上，它是 Map 类型的属性，其中包含其他HashMaps.因此，您需要首先获取文档，获取 users 属性的值，转换为 Map< String，Object> ，然后放入另一个 HashMap .这个新的HashMap包含一个以电子邮件地址为键的对象，另一个 HashMap 作为一个值，该对象又包含两个带有两个值的键.将所需数据添加到地图后，只需将文档写回即可.

What is users property? In fact, is a property of type Map, which contains in terms other HashMaps. So you need to get the document first, get the value of users property, cast to a Map<String, Object> and put inside another HashMap. This new HashMap contains an object with the email address as the key and another HashMap as a value, which again in terms contains two keys with two values. After you add the desired data to the Map, simply write the document back.

如果您不希望出现这种情况，则只需在每个(Network.NetworkUser)文档下创建一个用户子集合.

If you don't want that behavior, you can simply create a subcollection of users under each (Network.NetworkUser) document.

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