This simple class in Rails:

  class Assignment < ApplicationRecord

    belongs_to :project
    belongs_to :release

    accepts_nested_attributes_for :release, reject_if: :all_blank, allow_destroy: true

  end

Would represent several hundred lines in Java and Angular.

Do you really need to see every line of code required to explain every object and how they relate to each other to the various compilers in your application?