class Decidim::Meetings::RegistrationSerializer

def normalize_body(answer)
  return "" unless answer
  answer.body || answer.choices.pluck(:body)
end

def serialize
  {
    id: resource.id,
    code: resource.code,
    user: {
      name: resource.user.name,
      email: resource.user.email,
      user_group: resource.user_group&.name || ""
    },
    registration_form_answers: serialize_answers
  }
end

def serialize_answers
  questions = resource.meeting.questionnaire.questions
  answers = resource.meeting.questionnaire.answers.where(user: resource.user)
  questions.each_with_index.inject({}) do |serialized, (question, idx)|
    answer = answers.find_by(question: question)
    serialized.update("#{idx + 1}. #{translated_attribute(question.body)}" => normalize_body(answer))
  end
end