我是 AppSync 和 DynamoDB 的新手，如果這個問題很基本，我很抱歉。我有一個用于此架構的 AppSync 決議器：
type Profile {
name: String!
location: String!
}
input ProfileInput {
name: String!
location: String!
}
type Mutation {
createProfile(profileInput: ProfileInput!): Profile! @aws_cognito_user_pools @aws_api_key
}
決議器是：
要求
{
"version" : "2017-02-28",
"operation" : "UpdateItem",
"key" : {
"name" : $util.dynamodb.toDynamoDBJson($ctx.identity.username),
"attribute": $util.dynamodb.toDynamoDBJson("info")
},
"update" : {
"expression" : "SET #p :da",
"expressionNames" : {
"#p" : "data"
},
"expressionValues" : {
":da" : $util.dynamodb.toDynamoDBJson($ctx.args.profileInput)
}
}
}
回復
$util.toJson($ctx.result)
我發送給 Appsync 的請求：
mutation CreateProfileMutation {
createProfile(profileInput: {location: "Updated Location", name: "Updated Username"}) {
location
name
}
}
但是 Dynamodb 拋出了這個錯誤：
{
"data": null,
"errors": [
{
"path": [
"createProfile"
],
"data": null,
"errorType": "DynamoDB:DynamoDbException",
"errorInfo": null,
"locations": [
{
"line": 12,
"column": 3,
"sourceName": null
}
],
"message": "Invalid UpdateExpression: Syntax error; token: \":da\", near: \"#p :da\" (Service: DynamoDb, Status Code: 400, Request ID: some id, Extended Request ID: null)"
}
]
}
轉換后的模板為：
{
"version" : "2017-02-28",
"operation" : "UpdateItem",
"key" : {
"name" : {"S":"user#1"},
"attribute": {"S":"info"}
},
"update" : {
"expression" : "SET #p :da",
"expressionNames" : {
"#p" : "data"
},
"expressionValues" : {
":da" : {"M":{"name":{"S":"Updated Username"},"location":{"S":"Updated Location"}}}
}
}
}
看起來像是語法錯誤，但我無法弄清楚錯誤是什么。任何幫助表示贊賞。
uj5u.com熱心網友回復：
將SET在您的更新表達缺少操作的=運算元。
它應該"expression" : "SET #p = :da"代替"expression" : "SET #p :da".
轉載請註明出處，本文鏈接：https://www.uj5u.com/caozuo/331394.html