问题：
我正在为AWS的dynamoDB中的updateItem指令苦苦挣扎。据我所知，我已经按照文档中的说明以及Amazon支持技术的指示准确地编写了代码。但是，我收到一条错误消息，其中包含13个验证错误。他们对我没有意义。
我到目前为止所做的事情：
我搜索了StackOverflow并阅读了一些AWS DynamoDB问题。没有一个是正确的。我通常在网上搜索，但没有任何帮助。我一直在阅读AWS DynamoDB参考资料，但是它很密集，而且进展缓慢。我还在努力。
我构造了这个Codepen minCase pin。
任何帮助将不胜感激。
JavaScript代码
var dynamoDB = new AWS.DynamoDB();
params0 = {
'TableName': 'FHCRoomCounts',
'Key': {
timeSlot: '0830',
room: 'chapel',
},
'UpdateExpression': 'ADD registrants :n',
'ExpressionAttributeValues': {
':n' : 1,
},
'ReturnValues': 'ALL_NEW'
};
console.log('log params0 : ');
for(let [key, value] of Object.entries(params0)) {
console.log(key, value);
} // end for-let
console.log('calling dynamoDB.updateItem');
dynamoDB.updateItem(params0, function(err, data) {
if (err) {
console.log('Unable to update registrant: ' + '\n' + JSON.stringify(err, undefined, 2));
} else {
console.log('Increase registrant succeeded: ' + '\n' + JSON.stringify(data, undefined, 2));
} // end else
错误消息：13个验证错误。
以下是控制台日志。我记录了params对象，以便您可以看到正在提交到AWS的内容。
jquery loaded
AWS sdk loaded
log params0 :
TableName FHCRoomCounts
Key Object { timeSlot: "0830", room: "chapel" }
UpdateExpression ADD registrants :n
ExpressionAttributeValues Object { ":n": 1 }
ReturnValues ALL_NEW
calling dynamoDB.updateItem
Unable to update registrant:
{
"message": "There were 13 validation errors:\n*
InvalidParameterType: Expected params.Key['timeSlot'] to be a structure\n* UnexpectedParameter: Unexpected key '0' found in params.Key['timeSlot']\n* UnexpectedParameter: Unexpected key '1' found in params.Key['timeSlot']\n* UnexpectedParameter: Unexpected key '2' found in params.Key['timeSlot']\n* UnexpectedParameter: Unexpected key '3' found in params.Key['timeSlot']\n* InvalidParameterType: Expected params.Key['room'] to be a structure\n* UnexpectedParameter: Unexpected key '0' found in params.Key['room']\n* UnexpectedParameter: Unexpected key '1' found in params.Key['room']\n* UnexpectedParameter: Unexpected key '2' found in params.Key['room']\n* UnexpectedParameter: Unexpected key '3' found in params.Key['room']\n* UnexpectedParameter: Unexpected key '4' found in params.Key['room']\n* UnexpectedParameter: Unexpected key '5' found in params.Key['room']\n* InvalidParameterType: Expected params.ExpressionAttributeValues[':n'] to be a structure",
"code": "MultipleValidationErrors",
"errors": [
{
"message": "Expected params.Key['timeSlot'] to be a structure",
"code": "InvalidParameterType",
"time": "2019-06-15T04:51:05.288Z"
},
{
"message": "Unexpected key '0' found in params.Key['timeSlot']",
"code": "UnexpectedParameter",
"time": "2019-06-15T04:51:05.289Z"
},
{
"message": "Unexpected key '1' found in params.Key['timeSlot']",
"code": "UnexpectedParameter",
"time": "2019-06-15T04:51:05.289Z"
},
{
"message": "Unexpected key '2' found in params.Key['timeSlot']",
"code": "UnexpectedParameter",
"time": "2019-06-15T04:51:05.289Z"
},
{
"message": "Unexpected key '3' found in params.Key['timeSlot']",
"code": "UnexpectedParameter",
"time": "2019-06-15T04:51:05.289Z"
},
{
"message": "Expected params.Key['room'] to be a structure",
"code": "InvalidParameterType",
"time": "2019-06-15T04:51:05.290Z"
},
{
"message": "Unexpected key '0' found in params.Key['room']",
"code": "UnexpectedParameter",
"time": "2019-06-15T04:51:05.290Z"
},
{
"message": "Unexpected key '1' found in params.Key['room']",
"code": "UnexpectedParameter",
"time": "2019-06-15T04:51:05.290Z"
},
{
"message": "Unexpected key '2' found in params.Key['room']",
"code": "UnexpectedParameter",
"time": "2019-06-15T04:51:05.290Z"
},
{
"message": "Unexpected key '3' found in params.Key['room']",
"code": "UnexpectedParameter",
"time": "2019-06-15T04:51:05.290Z"
},
{
"message": "Unexpected key '4' found in params.Key['room']",
"code": "UnexpectedParameter",
"time": "2019-06-15T04:51:05.290Z"
},
{
"message": "Unexpected key '5' found in params.Key['room']",
"code": "UnexpectedParameter",
"time": "2019-06-15T04:51:05.290Z"
},
{
"message": "Expected params.ExpressionAttributeValues[':n'] to be a structure",
"code": "InvalidParameterType",
"time": "2019-06-15T04:51:05.291Z"
}
],
"time": "2019-06-15T04:51:05.291Z",
"stack": "validate@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:61:19246\n[311]</a.EventListeners.Core</<@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:60:25947\ncallListeners@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:62:26769\ns@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:62:26635\n[311]</a.EventListeners.Core</</<@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:60:25280\nt@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:59:25669\ngetCredentials/</<@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:59:25990\nget@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:59:30534\ngetCredentials/<@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:59:25896\ngetCredentials@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:59:25997\n[311]</a.EventListeners.Core</<@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:60:25149\ncallListeners@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:62:26740\nemit@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:62:26480\nemitEvent@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:62:12277\ne@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:62:7919\n[363]</i.prototype.runTo@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:64:9533\nrunTo@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:62:9575\nsend@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:62:9468\nmakeRequest@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:62:30482\ndefineMethods/</e.prototype[t]@https://sdk.amazonaws.com/js/aws-sdk-2.470.0.min.js:63:5136\nupdateTable@https://steve-alexander-pfmi.squarespace.com/test-register-2019:110:12\n"
}
答案 0 :(得分：1)
好的，在沉浸于AWS DynamoDB文档大约十年之后，我想出了指定var params0的正确方法。我会将其发布在这里，以防万一有人对未来感兴趣。
any_name = re.compile("\b({})\b".format(pattern))
答案 1 :(得分：0)
延迟回答，DynamoDB的棘手之处在于，一旦设置了数据类型，就必须确保在插入和更新等操作中始终以相同的方式解释它。有时，这可以由DynamoDBMarshaller很好地完成，有时您只需要像使用javascript一样自己给它正确的类型即可。
还需要注意的是，仅当您使用的键名可能与dynamodb保留字冲突时，才需要ExpressionAttributeValues。 “ COUNTER”是保留字。
TableName: 'MyTable',
Key: {
id: { S: '100001' }, // its forced as a string type by the 'S'
},
UpdateExpression: 'set counter=:c', // can be directly set if its not a reserved word
ConditionExpression: 'attribute_exists(id)', // conditional only update if exists
ExpressionAttributeValues: {
// all below are reserved word safe
':c': { N: '500' }, // its forced as a number
//':c': '500', // its not forced to a type, so it will try a string type
},
类型为N，S，BOOL，B，SS，例如，日期为'S'类型。
有用的链接：