Code review

[V-Lamp]

Overall, it is a well tested and library providing good type-safety and convenience to the user.

I liked the testing of the type classes with ScalaCheck and Discipline, while also having concrete test cases with manual sample data, acting also as a guidance of the intended usage of the methods.

In terms of improvements to the existing form of the library, I would:

• Provide more clarity on the use-case of the two apply methods on Encoder and Decoder, possibly reducing them to one.

• The usage of Shapeless is impressive but rather complicated. I would like to see more concrete use cases for this and maybe simplify it by separating concerns to make it more approachable to users.

Ideas/suggestions on improving it:

• I found it a bit hard to find what is the main added value of the library (a generically derived DynamoDBSerializer). I would like to make the code lead more naturally to this.

• Using Shapeless: I would investigate the usage of LabelledGeneric and annotating the keys with the type symbol instead of String name of the column. This might also simplify the type-level derivation since it could match case class field to the Key tagged with the same label.

• Possibly use SourceCode to get the key names when explicitly assigning them

• Allow encoding/decoding of nested case classes