Throughout the book, the examples deal mostly with creating data. When the quiz runs, it always persists new answers.

Let’s say I want to add UI for creating quizzes, and it has ability to edit templates for the quiz. How would you design the core API for that function? I came up with something like this:

def edit_template(quiz, template, fields_to_update)

It is a little bit awkward to test, though. Because I need to get the template from a sequence of pipes like this:

quiz =
  Quiz.new
  |> Quiz.add_template(template_fields)

template = Quiz.get_template_by_name(name)

quiz =
  Quiz.edit_template(quiz, template, template_fields)

Is there a clearly better aproach? Or maybe dealing with mutable/nested data always will be a little awkward.