//-- cosa vecchia ma spiega i criteria
https://bosnadev.com/2015/03/07/using-repository-pattern-in-laravel-5/

//--- repository torann, torann ha sempre buoni spunti
https://lyften.com/projects/laravel-repository/


//-- prettus -- la piu' completa
http://andersonandra.de/l5-repository/
https://www.programmersought.com/article/8489242324/