require 'spec_helper'

describe JSONAPI::Deserializable::Resource, '.has_many' do
  let(:deserializable_foo) do
    Class.new(JSONAPI::Deserializable::Resource) do
      has_many :foo do |rel, ids, types|
        Hash[foo_ids: ids, foo_types: types, foo_rel: rel]
      end
    end
  end

  context 'relationship is not empty' do
    let(:payload) do
      {
        'type' => 'foo',
        'relationships' => {
          'foo' => {
            'data' => [
              { 'type' => 'foo', 'id' => 'bar' },
              { 'type' => 'foo', 'id' => 'baz' }
            ]
          }
        }
      }
    end

    it 'creates corresponding fields' do
      actual = deserializable_foo.call(payload)
      expected = { foo_ids: %w(bar baz), foo_types: %w(foo foo),
                   foo_rel: payload['relationships']['foo'] }

      expect(actual).to eq(expected)
    end

    it 'defaults to creating a #{name}_ids and #{name}_types fields' do
      klass = Class.new(JSONAPI::Deserializable::Resource) do
        has_many
      end
      actual = klass.call(payload)
      expected = { foo_ids: %w(bar baz), foo_types: %w(foo foo) }

      expect(actual).to eq(expected)
    end
  end

  context 'relationship is empty' do
    it 'creates corresponding fields' do
      payload = {
        'type' => 'foo',
        'relationships' => {
          'foo' => {
            'data' => []
          }
        }
      }
      actual = deserializable_foo.call(payload)
      expected = { foo_ids: [], foo_types: [],
                   foo_rel: payload['relationships']['foo'] }

      expect(actual).to eq(expected)
    end
  end

  context 'relationship is absent' do
    it 'does not create corresponding fields' do
      payload = {
        'type' => 'foo',
        'relationships' => {}
      }
      actual = deserializable_foo.call(payload)
      expected = {}

      expect(actual).to eq(expected)
    end
  end

  context 'there is no relationships member' do
    it 'does not create corresponding fields' do
      payload = { 'type' => 'foo' }
      actual = deserializable_foo.call(payload)
      expected = {}

      expect(actual).to eq(expected)
    end
  end
end