身份验证后在iOS中使用DynamoDB [英] Using DynamoDB within iOS after authentication

问题描述

为了在 AWS 上建立一个系统，在该系统上可以从iOS应用程序创建和使用用户帐户，我最近关注了本教程。它使用 AWSMobileClient ， AWSAuthCore 和 AWSAuthUI 。

In order to set up a system on AWS where one can create and use user accounts from an iOS app, I recently followed this tutorial. It uses AWSMobileClient, AWSAuthCore and AWSAuthUI.

我在可以创建帐户并登录和注销的地方工作了。

I got up something working where I can create accounts and log in and out.

现在我想利用 DynamoDB 允许用户存储某些内容。为此，我尝试集成在其他应用程序中工作的 DynamoDB 代码。但是显然，两个应用程序环境并不完全相同，因此它无法按我的意愿运行。

Now I would like to make use of DynamoDB to allow the user to store something. For that, I have tried to integrate DynamoDB code that I have working in another app. But obviously the two apps environment are not quite the same, so it does not work as I would like it to.

这是我想要的DynamoDB数据的代码处理：

Here is the code for the DynamoDB data that I want to handle:

import Foundation
import AWSDynamoDB

@objcMembers
class DynamoDBData: AWSDynamoDBObjectModel, AWSDynamoDBModeling {

    var _message,_timeStamp,_user: String?

    class func dynamoDBTableName() -> String {
        return "DynamoDBData"
    }

    class func hashKeyAttribute() -> String {
        return "_timeStamp"
    }

    class func rangeKeyAttribute() -> String {
        return "_user"
    }

    override class func jsonKeyPathsByPropertyKey() -> [AnyHashable: Any] {
        return [
            "_message" : "message",
            "_timeStamp" : "timeStamp",
            "_user" : "user"
        ]
    }
}

这是我尝试的代码将某些内容保存到数据库并崩溃：

And here is the code for where I try to save something to the DB and get a crash:

@objc func handleTap() {
    print(#function)
    let dynamoDbObjectMapper = AWSDynamoDBObjectMapper.default() // Here the app is crashing.

    // Create data object using the data model:
    let dataBlock = DynamoDBData()
    dataBlock?._message = "message-TEST"
    dataBlock?._timeStamp = "timeStamp-TEST"
    dataBlock?._user = "user-TEST"

    // Save the new item:
    dynamoDbObjectMapper.save(dataBlock!, completionHandler: {
        (error: Error?) -> Void in

        if let error = error {
            print("Amazon DynamoDB Save Error: \(error)")
            return
        }
        print("An item was saved.")
    })
}

最后，这是我在应用程序崩溃时收到的消息：

Finally, this is the message I get when the app is crashing:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', 
reason: 'The service configuration is `nil`. You need to configure `Info.plist` 
or set `defaultServiceConfiguration` before using this method.'

一些有关如何从此处前进的指导（甚至是部分指导）将非常有帮助。

Some guidance (even partial) on how to move forward from here would be very helpful.

推荐答案

检查您的 awsconfiguration.json 包含以下条目：

Check that your awsconfiguration.json has the following entry:

    "DynamoDBObjectMapper": {
        "Default": {
            "Region": "AWS_REGION_NAME"
        }
    }

设置您自己的 AWS_REGION_NAME （例如， us-east-1 ）。

setting your own AWS_REGION_NAME (e.g., us-east-1).

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