dynamodb update incr The provided expression refers to an attribute that does not exist in the item

update_err:
ValidationException: The provided expression refers to an attribute that does not exist in the item
status code: 400, request id: LNC41OG6596V2CTPUOVHNRB8CJVV4KQNSO5AEMVJF66Q9ASUAAJG

原本使用的语句：

 

 {
    TableName: "Music",
    Key: {
        "Artist":"No One You Know",
        "SongTitle":"Call Me Today"
    },
    UpdateExpression: "SET Plays = Plays + :incr",
    ExpressionAttributeValues: { 
        ":incr": 1
    },
    ReturnValues: "UPDATED_NEW"
}
 

红色标记地方并不能执行成功，修改为：

UpdateExpression: aws.String("ADD play :incr"),  即可  

 

尝试了三个小时，最后在官方论坛上发现解决方法

 

 

https://forums.aws.amazon.com/message.jspa?messageID=629222