DynamoDB custom index serverless.yml example

serverless.yml

service: service-name

provider:
  name: aws
  runtime: nodejs6.10

functions:
  myfunc:
    handler: handler.myfunc
    events:
      - http:
          path: myfunc
          method: post
          cors: true

resources:
  Resources:
    myDynamoDBTable:
      Type: AWS::DynamoDB::Table
      Properties:
        AttributeDefinitions:
        - AttributeName: Album
          AttributeType: S
        - AttributeName: Artist
          AttributeType: S
        - AttributeName: Sales
          AttributeType: N
        KeySchema:
        - AttributeName: Album
          KeyType: HASH
        - AttributeName: Artist
          KeyType: RANGE
        ProvisionedThroughput:
          ReadCapacityUnits: '5'
          WriteCapacityUnits: '5'
        TableName: myTableName
        GlobalSecondaryIndexes:
        - IndexName: myGSI
          KeySchema:
          - AttributeName: Sales
            KeyType: HASH
          - AttributeName: Artist
            KeyType: RANGE
          Projection:
            NonKeyAttributes:
            - Album
            ProjectionType: INCLUDE
          ProvisionedThroughput:
            ReadCapacityUnits: '5'
            WriteCapacityUnits: '5'
        LocalSecondaryIndexes:
        - IndexName: myLSI
          KeySchema:
          - AttributeName: Album
            KeyType: HASH
          - AttributeName: Sales
            KeyType: RANGE
          Projection:
            NonKeyAttributes:
            - Artist
            ProjectionType: INCLUDE
    mySecondDDBTable:
      Type: AWS::DynamoDB::Table
      DependsOn: myDynamoDBTable
      Properties:
        AttributeDefinitions:
        - AttributeName: ArtistId
          AttributeType: S
        - AttributeName: Concert
          AttributeType: S
        - AttributeName: TicketSales
          AttributeType: S
        KeySchema:
        - AttributeName: ArtistId
          KeyType: HASH
        - AttributeName: Concert
          KeyType: RANGE
        TableName: myTableName2
        ProvisionedThroughput:
          ReadCapacityUnits: '5'
          WriteCapacityUnits: '5'
        GlobalSecondaryIndexes:
        - IndexName: myGSI
          KeySchema:
          - AttributeName: TicketSales
            KeyType: HASH
          Projection:
            ProjectionType: KEYS_ONLY
          ProvisionedThroughput:
            ReadCapacityUnits: '5'
            WriteCapacityUnits: '5'

Hi can this be possible in dynamodb
I am trying to create a table with platform, profileid, and username attributes. it is giving error that

ValidationException: Hash Key not specified in Attribute Definitions. Type unknown.: DynamoDB - Error

I want my schema like that

ProfileTable:
  Type: AWS::DynamoDB::Table
  Properties:
    TableName: ProfileTable
    AttributeDefinitions:
      -
        AttributeName: platform
        AttributeType: S
      -
        AttributeName: profileid
        AttributeType: S
      -
        AttributeName: username
        AttributeType: S
    KeySchema:
      -
        AttributeName: platform
        KeyType: RANGE
      -
        AttributeName: profileid__username
        KeyType: HASH
    ProvisionedThroughput:
      ReadCapacityUnits: ${self:custom.db.rcu}
      WriteCapacityUnits: ${self:custom.db.wcu}

Your HASH key needs to be an Attribute as well, so add it like you added platform.