Part of my IEx config file

.iex.exs

#
# This module defines some handy functions for use in iex
#
defmodule DebugTools do
  @doc ~S"""
  Cast all the params provided here into an Ecto.Changeset.
  
  This defeats Ecto's whitelist approach so you should never use this in real code!
  It's intended as a debug tool for use in tests of IEx sessions.
  """
  def ecto_cast_all(data, params, opts \\ []),
    do: Ecto.Changeset.cast(data, params, Map.keys(params), opts)
end