AppSync / Apollo - 订阅 - 更新 model 内的嵌套数组

Question

对于聊天应用程序，我正在尝试更新嵌套数组的 Apollo 缓存，以便在收到任何对话的消息时，用户可以实时看到最新消息。

我有以下 AppSync 架构。

 type Conversation
   @model
   @auth(rules: [
     { allow: owner, ownerField: "users", operations: [create, read, delete, update] }
     { allow: private, provider: iam, operations: [read, create, update, delete] }
   ]) {
     messages: [Message] @hasMany(indexName: "messagesByConversation", limit: 1)
     users: [String]
     createdAt: AWSDateTime
     updatedAt: AWSDateTime
}

type Message
   @model(mutations: { create: "createMessage", update: "updateMessage" })
   @auth(rules: [
     { allow: groups, groups: ["Users"] }
     { allow: owner, operations: [read, create, update], ownerField: "users" }
     { allow: private, provider: iam }
   ]) {
     conversationId: ID! @index(name: "messagesByConversation", sortKeyFields: ["createdAt"], queryField: "messagesByConversation")
     text: String
     users: [String]!
     receiver: ID!
     sender: ID!
     createdAt: AWSDateTime!
     updatedAt: AWSDateTime
}

 type Subscription {
   onCreateMessageForSenderUser(sender: String!): Message @aws_subscribe(mutations: ["createMessage"])
   onCreateMessageForReceiverUser(receiver: String!): Message @aws_subscribe(mutations: ["createMessage"])
 }

其中有嵌套的 model messages: [Message]

在 Apollo Cache 中，我可以看到创建了一个名为__ ModelMessageConnection的新类型名称，以方便连接

我有一个监听新消息的订阅（在这种情况下，当我的用户是发件人时）。

我面临的问题是如何更新缓存，以便在收到新消息的订阅时更新会话。

const { data: senderMessageData } = useSubscription(
    gql(SENDER_MESSAGE_SUBSCRIPTION),
    {
      skip: !subData?.sub,
      variables: {
        sender: subData?.sub
      },
      onSubscriptionData: (options) => {
        options.client.cache.modify({
          //TODO: do something here?
        });
      }
    }
  );