My Notes

This is the code and some personal notes from the Shapeless? - Easy! talk where Valentin Kasas explains in a great way an advanced example of a real life use case (with slides).

Computing deltas

• Imagine we want to be able to determine what are the difference between two objects of the same type
• For example, we need to know what have changed in our DB since the last backup
• We need to be able to compute such deltas over a wide variety of classes, that are unrelated
• Of course, doing this by hand for each and every class is not an option

Our diff representation

It is not a good practice to have such a big json with many root variables. Nevertheless, we might need to call a rest api that will give a json like this

{
  "a1": ...,
  "a2" : ...,
  "a3" : ...,
  "a4" : ...,
  "a5" : ...,
  "a6" : ...,
  "a7" : ...,
  "a8" : ...,
  "a9" : ...,
  "a10" : ...,
  "a11" : ...,
  "a12" : ...,
  "a13" : ...,
  "a14" : ...,
  "a15" : ...,
  "a16" : ...,
  "a17" : ...,
  "a18" : ...,
  "a19" : ...,
  "a20" : ...,
  "a21": ...,
  "a22" : ...,
  "a23" : ...,
  "a24" : ...,
  ....
}

First approach

Since scala 2.11 we can have case class with more than 22 fields, so the following compiles.

Before the tutorial 

You should :

• read 
  • Play Documentation : ScalaActions
  • Play Documentation : ScalaForms
  • Play Documentation : ScalaJsonAutomated
• have  basic understanding of scala future transformation (map, flatMap)
• have basic understanding of scala implicits
• clone play2.5-skeleton-compileDI. This example uses compile-time dependency injection. You can use run-time DI if you feel confident about it.
• download and install mongodb (brew install mongo for mac or check the video)
• download and install mongochef

Tutorial 

After the tutorial

You should be able to :

Whenever I come I across a Scala library I take a note of it here. This collection is neither complete nor have I used all of these libraries. It is mainly used as a point of reference if I want to find some functionality implemented in a Scala library.

Akka

Whenever I come I across a Play library I take a note of it here. This collection is neither complete nor have I used all of these libraries. It is mainly used as a point of reference if I want to find some functionality implemented in a Play library.

Akka

Cache

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