Error (Protocol.UndefinedError)

[shahryarjb]

Hello, please use this WSDL link http://banktest.ir/gateway/saman/Payments/InitPayment?wsdl

elixir: v1.8.0 , {:soap, "~> 1.0.1"}

when I use it like this:

defmodule Khatoghalam.Extera.Bank.Saman do
  def get_saman_token do
    wsdl_url = "http://banktest.ir/gateway/saman/Payments/InitPayment?wsdl"
    with {:ok, wsdl} <- Soap.init_model(wsdl_url, :url) do
        IO.inspect(wsdl)
    else
      nil ->      {:unknown_error}
      _   ->      {:unknown_error}
    end
  end
end

I have this error:

** (Protocol.UndefinedError) protocol Enumerable not implemented for nil. This protocol is implemented for: Ecto.Adapters.SQL.Stream, Postgrex.Stream, DBConnection.Stream, DBConnection.PrepareStream, Scrivener.Page, HashSet, Range, Map, Function, List, Stream, Date.Range, HashDict, GenEvent.Stream, MapSet, File.Stream, IO.Stream
    (elixir) /private/tmp/elixir-20190114-93661-1hq8sk/elixir-1.8.0/lib/elixir/lib/enum.ex:1: Enumerable.impl_for!/1
    (elixir) /private/tmp/elixir-20190114-93661-1hq8sk/elixir-1.8.0/lib/elixir/lib/enum.ex:141: Enumerable.reduce/3
    (elixir) lib/stream.ex:936: Stream.do_enum_transform/7
    (elixir) lib/stream.ex:860: Stream.do_transform/5
    (sweet_xml) lib/sweet_xml.ex:582: anonymous fn/4 in SweetXml.continuation_opts/2
    (xmerl) xmerl_scan.erl:568: :xmerl_scan.scan_document/2
    (xmerl) xmerl_scan.erl:291: :xmerl_scan.string/2
    (sweet_xml) lib/sweet_xml.ex:237: SweetXml.parse/2
    (sweet_xml) lib/sweet_xml.ex:421: SweetXml.xpath/2
    (sweet_xml) lib/sweet_xml.ex:531: anonymous fn/3 in SweetXml.xmap/3
    (elixir) lib/map.ex:791: Map.get_and_update/3
    (sweet_xml) lib/sweet_xml.ex:531: SweetXml.xmap/3
    (sweet_xml) lib/sweet_xml.ex:530: SweetXml.xmap/3
    (soap) lib/soap/wsdl.ex:37: Soap.Wsdl.parse/3
    (khatoghalam) lib/khatoghalam/extera/bank/saman.ex:4: Khatoghalam.Extera.Bank.Saman.get_saman_token/0

How can I fix this ?

I think this def doesn't work

@spec get_schema_attributes(String.t()) :: map()
  defp get_schema_attributes(wsdl) do
    wsdl
    |> xpath(
      ~x"//*[local-name() = 'schema']",
      target_namespace: ~x"./@targetNamespace"s,
      element_form_default: ~x"./@elementFormDefault"s
    )
  end

and the end output is nil when I comment that function

[Nitrino]

Hi @shahryarjb
Sorry for the long answer. PR #81 should fix your issue.