I have this registration form using the pow library:

<%= form_for @changeset, @action, [as: :user], fn f -> %>
  <%= if @changeset.action do %>
    <div class="alert alert-danger">
      <p>Oops, something went wrong! Please check the errors below.</p>
    </div>
  <% end %>

  <%= label f, :role, "Are you a Teacher or Student?" %>
  <%= select f, :role, ["Student": "student", "Teacher": "teacher"] %>
  <%= error_tag f, :role %>

  <%= label f, Pow.Ecto.Schema.user_id_field(@changeset) %>
  <%= text_input f, Pow.Ecto.Schema.user_id_field(@changeset) %>
  <%= error_tag f, Pow.Ecto.Schema.user_id_field(@changeset) %>

  <%= label f, :first_name %>
  <%= text_input f, :first_name %>
  <%= error_tag f, :first_name %>

  <%= label f, :last_name %>
  <%= text_input f, :last_name %>
  <%= error_tag f, :last_name %>

  <%= label f, :password %>
  <%= password_input f, :password %>
  <%= error_tag f, :password %>

  <%= label f, :password_confirmation %>
  <%= password_input f, :password_confirmation %>
  <%= error_tag f, :password_confirmation %>

  <div>
    <%= submit "Register" %>
  </div>
<% end %>

When registration is successful, a user is added to the “users” table. However, I would like to make a function call upon successful registration which would also populate the user in either my “students” table or “teachers” table depending on their role. How would I be able to do this?