Is there any book for Ecto?

Is there any book that explains Ecto in depth and contains many examples? All the tutorials that I have gone through as well as the book “Programming Phoenix” by McCord, Tate and Valim just covered basic uses cases. I have to admit I am really struggling with it. I am especially interested in examples dedicated to complex relations (for example, tree like structures). Thank you!

Have you seen the Ecto Book by Plataformatec?

Thank you.

Official documentation is also quite good: Ecto — Ecto v3.14.0.

this talk on ecto is also pretty darn good.

Embrace the Database With Ecto by Josh Branchaud