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Rails 3 ActiveRecord nested associations select query
def quiz
    @quiz = Quiz.find(params[:id])

    @questions = @quiz.questions.select('id, content') # returns only selected fields
    @results = @quiz.results.select('id, content, points_limit') # returns only selected fields

    @questions.each do |question|
        question['answers'] = question.answers.select('id, content, points') #returns whole object
    end

    @return = Hash.new
    @return['questions'] = @questions
    @return['results'] = @results

    respond_to do |format|
        format.json { render json: @return }
        format.xml { render xml: @return }
    end
end

question.answers.select('id, content, points')

@answers = Answer.select([:id, :content, :points])
                 .where(question_id: @questions.pluck(:id))

SELECT id, content, points
FROM answers
WHERE question_id in (<question_ids array>)