我正在尝试使用带有过滤器的查询:
query queryPitchesByApprovedIndex($approved: Boolean = true) {
queryPitchesByApprovedIndex(approved: $approved) {
items {
id
}
}
}
由 AppSync 制作的映射模板如下所示:
{
"version": "2017-02-28",
"operation": "Query",
"query": {
"expression": "#approved = :approved",
"expressionNames": {
"#approved": "approved",
},
"expressionValues": {
":approved": {"B": $util.dynamodb.toBinary($ctx.args.approved)},
},
},
"index": "approved-index",
"limit": $util.defaultIfNull($ctx.args.first, 20),
"nextToken": $util.toJson($util.defaultIfNullOrEmpty($ctx.args.after, null)),
"scanIndexForward": true,
"select": "ALL_ATTRIBUTES",
}
我得到的错误是:
Unable to parse the JSON document: 'Unrecognized token '$util': was expecting ('true', 'false' or 'null')\n at [Source: (String)\"{\n \"version\": \"2017-02-28\",\n \"operation\": \"Query\",\n \"query\": {\n \"expression\": \"#approved = :approved\",\n \"expressionNames\": {\n \"#approved\": \"approved\",\n },\n \"expressionValues\": {\n \":approved\": {\"B\": $util.dynamodb.toBinary($ctx.args.approved)},\n },\n },\n \"index\": \"approved-index\",\n \"limit\": 20,\n \"nextToken\": null,\n \"scanIndexForward\": true,\n \"select\": \"ALL_ATTRIBUTES\",\n}\"; line: 10, column: 31]'
知道如何解决这个问题吗?
最佳答案
$util.dynamodb.toBinary(String data)
采用 String
作为输入,但您传递的是 Boolean
,这就是为什么评估失败。
这是很好的反馈,我将与团队核实是否可以使实用程序更加宽松并采用 bool 值$util.dynamodb.toBinary(Boolean data)
同时,这里有一个可能的解决方法:
#if($ctx.args.approved)
#set($approved = $util.dynamodb.toBinaryJson("true"))
#else
#set($approved = $util.dynamodb.toBinaryJson("false"))
#end
{
"version": "2017-02-28",
"operation": "Query",
"query": {
"expression": "#approved = :approved",
"expressionNames": {
"#approved": "approved",
},
"expressionValues": {
":approved": $approved
},
},
"index": "approved-index",
"limit": $util.defaultIfNull($ctx.args.first, 20),
"nextToken": $util.toJson($util.defaultIfNullOrEmpty($ctx.args.after, null)),
"scanIndexForward": true,
"select": "ALL_ATTRIBUTES",
}
关于amazon-dynamodb - 无法解析 JSON 文档 : Unrecognized token '$util' : was expecting ('true' , 'false' 或 'null' ),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56065652/