Helper Methods to translate Ecto.Changeset errors to map or list

schema_helpers.ex

defmodule MyAppWeb.Schema.Helpers do
  def translate_changeset_errors(changeset) do
    changeset
      |> changeset_errors_to_map()
      |> Enum.map(fn {key, errors} -> "#{key}: #{Enum.join(errors, ", ")}" end)
  end

  defp changeset_errors_to_map(nil), do: %{}
  defp changeset_errors_to_map(changeset) do
    Ecto.Changeset.traverse_errors(changeset, fn {msg, opts} ->
      Enum.reduce(opts, msg, fn {key, value}, acc ->
        try do
          String.replace(acc, "%{#{key}}", to_string(value))
        rescue
          Protocol.UndefinedError -> acc
        end
      end)
    end)
  end
end