我一直在四处走动，只是不清楚该怎么做。
我有一个简单的表，我想在其中对几列进行查询。据我了解，这意味着为要查询的每一列创建一个二级索引。我已经定义了表——使用无服务器框架serverless.yml——并且收到了各种奇怪的错误消息。
目前的serverless.yml定义是：
resources:
Resources:
MessagesDynamoDBTable:
Type: 'AWS::DynamoDB::Table'
Properties:
AttributeDefinitions:
- AttributeName: messageId
AttributeType: S
- AttributeName: room
AttributeType: S
- AttributeName: userId
AttributeType: S
KeySchema:
- AttributeName: messageId
KeyType: HASH
- AttributeName: userId
KeyType: RANGE
LocalSecondaryIndexes:
- IndexName: roomIndex
KeySchema:
- AttributeName: room
KeyType: HASH
Projection:
ProjectionType: "KEYS_ONLY"
- IndexName: userId
KeySchema:
- AttributeName: userId
KeyType: HASH
Projection:
ProjectionType: "KEYS_ONLY"
ProvisionedThroughput:
ReadCapacityUnits: 1
WriteCapacityUnits: 1
TableName: ${self:custom.tableName}
它意味着类似于 Slack 服务 - 因此我想查询来自房间、用户等的条目。
根据我能找到的文档，这个定义是有意义的。一个应该为索引中使用的列声明属性，我已经这样做了。KeySchema - 我真的只需要 messageId 字段，但是一条错误消息表明它需要一个 RANGE 索引，所以我将 userId 字段添加到 KeySchema 只是为了关闭它。根据我找到的文档，二级索引字段看起来很正确。
有了这个定义，我在尝试使用部署时遇到了这个错误serverless deploy
An error occurred: MessagesDynamoDBTable - Property AttributeDefinitions is inconsistent
with the KeySchema of the table and the secondary indexes.
我尝试了几种变体，也遇到了其他奇怪的错误。以下是一些，但我不记得对定义的相应更改。
An error occurred: MessagesDynamoDBTable - One or more parameter values were invalid:
Index KeySchema does not have a range key for index: userId (Service: AmazonDynamoDBv2; Status Code: 400;
Error Code: ValidationException; Request ID: 1KFA2IMASC12HRLLDPG753CU63VV4KQNSO5AEMVJF66Q9ASUAAJG).
An error occurred: MessagesDynamoDBTable - 1 validation error detected: Value '[com.amazonaws.dynamodb.v20120810.KeySchemaElement@aa4cdc91,
com.amazonaws.dynamodb.v20120810.KeySchemaElement@d2cd6f64, com.amazonaws.dynamodb.v20120810.KeySchemaElement@4d7c1f9,
com.amazonaws.dynamodb.v20120810.KeySchemaElement@d2cd6f64]' at 'keySchema' failed to satisfy constraint: Member must have length less
than or equal to 2 (Service: AmazonDynamoDBv2; Status Code: 400; Error Code: ValidationException; Request ID: BOVVBQ1F35VA18CCF3L5MSKS1FVV4KQNSO5AEMVJF66Q9ASUAAJG).
An error occurred: MessagesDynamoDBTable - Property AttributeDefinitions is inconsistent with the KeySchema
of the table and the secondary indexes.
An error occurred: MessagesDynamoDBTable - One or more parameter values were invalid: Index KeySchema does not have a range key for index:
userIdIndex (Service: AmazonDynamoDBv2; Status Code: 400; Error Code: ValidationException; Request ID: KFS63VSPKDUC60DV6U2V47UP27VV4KQNSO5AEMVJF66Q9ASUAAJG).
An error occurred: MessagesDynamoDBTable - One or more parameter values were invalid: Table KeySchema does not have a range key,
which is required when specifying a LocalSecondaryIndex (Service: AmazonDynamoDBv2; Status Code: 400; Error Code: ValidationException; Request ID: 86Q2JSPM6Q9UPNIEOVHALLIIQJVV4KQNSO5AEMVJF66Q9ASUAAJG).