#
# This file is part of Astarte.
#
# Copyright 2017 Ispirata Srl
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

defmodule Astarte.Pairing.APIWeb.ChangesetView do
  use Astarte.Pairing.APIWeb, :view

  @doc """
  Traverses and translates changeset errors.

  See `Ecto.Changeset.traverse_errors/2` and
  `Astarte.Pairing.APIWeb.ErrorHelpers.translate_error/1` for more details.
  """
  def translate_errors(changeset) do
    Ecto.Changeset.traverse_errors(changeset, &translate_error/1)
  end

  def render("error.json", %{changeset: changeset}) do
    # When encoded, the changeset returns its errors
    # as a JSON object. So we just pass it forward.
    %{errors: translate_errors(changeset)}
  end
end
