Swift NSInternalInconsistencyException\u变量不是projectName.Classname的属性
我正在尝试使用DynamoDB表,并已成功连接到它,但无法读取它。当我尝试时,会出现以下错误: 由于未捕获的异常“NSInternalInconsistencyException”,正在终止应用程序,原因:“\u datePublished不是ProjectName.Article的属性。” 以下是我的文章类别/模型:Swift NSInternalInconsistencyException\u变量不是projectName.Classname的属性,swift,amazon-web-services,amazon-dynamodb,Swift,Amazon Web Services,Amazon Dynamodb,我正在尝试使用DynamoDB表,并已成功连接到它,但无法读取它。当我尝试时,会出现以下错误: 由于未捕获的异常“NSInternalInconsistencyException”,正在终止应用程序,原因:“\u datePublished不是ProjectName.Article的属性。” 以下是我的文章类别/模型: class Article: AWSDynamoDBObjectModel, AWSDynamoDBModeling { var _articleSource: Strin
class Article: AWSDynamoDBObjectModel, AWSDynamoDBModeling {
var _articleSource: String?
var _articleUrl: String?
var _datePublished: String?
var _headline: String?
var _imageURL: String?
var _rating: String?
var _listingId: String?
class func dynamoDBTableName() -> String {
return "tableName"
}
class func hashKeyAttribute() -> String {
return "_listingId"
}
class func rangeKeyAttribute() -> String {
return "_articleUrl"
}
override class func jsonKeyPathsByPropertyKey() -> [AnyHashable: Any] {
return [
"_articleSource" : "articleSource",
"_articleUrl" : "articleUrl",
"_datePublished" : "datePublished",
"_headline" : "headline",
"_imageURL" : "imageURL",
"_rating" : "rating",
"_listingId" : "listingId",
]
}
}
我在ViewDidLoad
中调用的函数可以从数据库中读取一篇文章:
func readArticle() {
let dynamoDbObjectMapper = AWSDynamoDBObjectMapper.default()
// Create data object
let article: Article = Article();
dynamoDbObjectMapper.load(
Article.self,
hashKey: "2018-03-17T08:50:30+00:00",
rangeKey: "https://www.example.com",
completionHandler: {
(objectModel: AWSDynamoDBObjectModel?, error: Error?) -> Void in
if let error = error {
print("Amazon DynamoDB Read Error: \(error)")
return
}
print("Article:\n \(article)")
})
}
我做错了什么?datePublished存在于数据库的该条目中,并在模型中定义,检查datePublished是数据库中的字符串还是日期类型。如果类型不匹配,则会出现错误。事实证明AWS SDK还不完全兼容Swift 4。在swift 4中,必须将@objcMembers放在对象模型类定义之前,如:
@objcMembers class Article: AWSDynamoDBObjectModel, AWSDynamoDBModeling {
}