Optional params inside require weird behavior

[zetachang]

An optional param specify restricted values inside a require block not work.

Below is the failing spec.

require 'spec_helper'

describe Grape::Validations do

  subject { Class.new(Grape::API) }

  def app
    subject
  end

  describe 'params' do
    context 'optional' do
      it 'should fucking fail' do
        subject.params do
          optional :a_array do
            requires :a_string, type: String, :values => ["a", "b"], :default => "a"
          end
        end
        subject.get '/optional_with_required_values' do
          'optional works!'
        end

        get '/optional_with_required_values'
        expect(last_response.status).to eq(200)
      end
    end
  end
end

[dm1try]

@zetachang , thx. seems like a bug. I think it's related to this commit 177a14c#diff-5952004de7a6d081b88629647a47d85aR11

[dm1try]

@dblock expected behaviour is described in README

optional :audio do
  requires :format, type: Symbol, values: [:mp3, :wav, :aac, :ogg], default: :mp3
end

... and params[:audio][:format] is required only if params[:audio] is present.

I confirm :)