AppSync 与 DynamoDB“无效的 KeyConditionExpression：属性名称是保留关键字；保留关键字：名称”

Question

I'm working in the AWS console. When I executed the following function on the query screen, "Invalid KeyConditionExpression: Attribute name is a reserved keyword; reserved keyword: name" has occurred. I'm renaming it with "expressionAttributeNames", why?

{
    "operation" : "Query",
    "query" : {
        "expressionAttributeNames": {"#abc": "name"},
        "expression": "#abc = :abc",
        "expressionValues" : {
            ":abc" : $util.dynamodb.toDynamoDBJson($ctx.args.name)
        }
    }
}

Answer 1

You can use any attribute name in a key condition expression, provided that the first character is az or AZ and the second character (if present) is az, AZ, or 0-9. In addition, the attribute name must not be a DynamoDB reserved word. The word "name" is already reserved by DynamoDB . Check all reserved words here: https://docs.amazonaws.cn/en_us/amazondynamodb/latest/developerguide/ReservedWords.html