changeset.ex

defmodule MyApp.Changeset do
  def cast(model_or_changeset, :empty, required, optional) do
    Ecto.Changeset.cast(model_or_changeset, :empty, required, optional)
  end

  def cast(model_or_changeset, params, required, optional) do
    param_keys = params |> Map.keys |> Enum.map(&to_string/1)
    allowed_params = (required ++ optional) |> Enum.map(&to_string/1)
    disallowed_params = param_keys -- allowed_params

    if length(disallowed_params) > 0 do
      Logger.debug """
      Some params were removed from the changeset.
      Given params: #{inspect param_keys}
      Allowed params: #{inspect allowed_params}
      Disallowed params: #{inspect disallowed_params}
      """
    end
    Ecto.Changeset.cast(model_or_changeset, params, required, optional)
  end
end