Parser for Ecto Changeset Errors

error_parser.ex

defmodule Ponty96.ToolTips.ErrorParser do
  import Ponty96.ToolTips.Camelize, only: [camelize: 1]

  def parse_errors(changeset) do
    errors = 
      changeset
      |> handle_changeset_errors()
      |> Map.to_list
      |> Enum.map(fn error ->
          key =  error |> elem(0) |> Atom.to_string |> camelize()
          [val] = elem(error, 1)
          %{key: key, message: val}
        end)
    errors
  end

  defp handle_changeset_errors(changeset) do
    errors = Ecto.Changeset.traverse_errors(changeset, fn {msg, opts} ->
      Enum.reduce(opts, msg, fn {key, value}, _acc ->
        String.replace(msg, "%{#{key}}", to_string(value))
      end)
    end)

    errors
  end
end