Phoenix forms backed by embedded schemas

Last week I shared a tip on how to decouple forms from our databases by using a regular map with the to_form/2 helper.

People asked about another approach, and I wanted to share it here.

If you have complex forms that you want to decouple from the database, we can use Ecto’s embedded schemas to back a form. That gives us all the power of Ecto changesets without having to tie our form to our database schema!