Very customized Phoenix form helpers

This is a followup to our episode on making form inputs for lists (Ecto array types).

Phoenix form input helpers

This time, we're making even more customized Phoenix form input helpers. Like before they'll allow editing a collection of entries, but instead of array types directly in a user's schema, they'll be fields from a has_many associated schema. We'll work through a variety of potential pitfalls and create a very unorthodox input helper.

(Source code available for premium members)