jcelliott

defmodule Flatten do
  @doc """
  Flattens a list by recursively flattening the head and tail of the list
  """
  def flatten([head | tail]), do: flatten(head) ++ flatten(tail)
  def flatten([]), do: []
  def flatten(element), do: [element]
end

laserlemon

Introduction

Disclaimer: I'm a one-day-old Elixir/Phoenix developer.

In Sonny's training yesterday, we used an Ecto.Changeset to handle user registration (a database-backed operation). This worked perfectly for rendering the intial form and re-rendering the form with validation errors.

This is because our Workshop.RegistrationController is calling Repo.Insert which sets the changeset's :action, whether or not the insertion succeeds. Then Phoenix.HTML's form_for function appropriately sets errors on the form so they can be rendered on the page.

The Problem