# frozen_string_literal: true
require 'spec_helper'

describe 'mapping from one instance to a class' do
  before do
    define_klass 'Foo', attrs: [:id, :foo_name]
    define_klass 'Bar', attrs: [:id, :name]

    define_klass 'FooToBarMapper', base: Karta::Mapper do
      one_to_one_mapping :id

      def map_name(foo, bar)
        bar.name = foo.foo_name
      end
    end
  end

  let(:foo) { Foo.new(id: 1, foo_name: 'Foo') }

  describe 'using a mapper object' do
    subject { FooToBarMapper.map(from: foo, to: Bar) }

    it 'creates a new instance and maps all fields defined in the mapper' do
      expect(subject.class).to eq Bar
      expect(subject.id).to    eq foo.id
      expect(subject.name).to  eq foo.foo_name
    end
  end

  describe 'using the mapper registry' do
    before do
      Karta.register_mapper FooToBarMapper
    end

    subject { Karta.map(from: foo, to: Bar) }

    it 'creates a new instance and maps all fields defined in the mapper' do
      expect(subject.class).to eq Bar
      expect(subject.id).to    eq foo.id
      expect(subject.name).to  eq foo.foo_name
    end
  end
end