meteor

Scanamo Format

The meteor-scanamo module provides integration with Scanamo format library. It provides implicit construction from scanamo’s DynamoFormat to meteor’s codec.

Note: The module uses scanamo-format’s version 1.0.0-M11 instead of latest because in my experience, this is the most stable version. however, because it is an older version when DynamoDB did not support empty String, the following scenario:

  • Empty string: ""
  • Optional none: None
  • Optional some of empty string: Some("")

are all serialized to an AttributeValue of null. This is problematic because once the value is written down, reading it back is difficult. The same reason why meteor doesn’t provide a Decoder instance for Option[T] but only provides syntax to help to deal with optional value.

import meteor.scanamo.formats.conversions._
import meteor.codec.Codec
import org.scanamo.DynamoFormat

implicit val bookFormat: DynamoFormat[Book] = ...
val bookCodec: Codec[Book] = implicitly[Codec[Book]]
← Dynosaur Schema