Fail with answer's specs

answer.rb

class Answer < ActiveRecord::Base
  belongs_to :question
  belongs_to :user

  validates :body, :question_id, :user_id, presence: true

  default_scope { order("right_answer DESC").order("created_at DESC") }

  def is_right_answer
    self.question.answers.where("right_answer = ?", true).update_all("right_answer = false")
    self.update(right_answer: true)
  end

  def not_right_answer
    self.update(right_answer: false)
  end
end

answer_spec.rb

    context "executes methods correctly" do
      context "#is_right_answer" do
        before {
          @qra = question_ra
          @qra.answers.first.is_right_answer
          @qra.answers.reload
          @qra.reload
          # raise @qra.answers.first.inspect
        }
        it { expect(question_ra.answers.first.right_answer).to eq true }
        it { expect(question_ra.answers.last.right_answer).to eq false }

        it "right answer of answer's question_ra is equal answer " do
          # raise question_ra.inspect
          expect(question_ra.right_answer).to eq(question_ra.answers.first)
        end
      end
    end
  

gistfile1.txt

Failures:

  1) Answer public instance methods executes methods correctly #is_right_answer should eq true
     Failure/Error: it { expect(question_ra.answers.first.right_answer).to eq true }
     
       expected: true
            got: false
     
       (compared using ==)
     # ./spec/models/answer_spec.rb:35:in `block (5 levels) in <top (required)>'

  2) Answer public instance methods executes methods correctly #is_right_answer right answer of answer's question_ra is equal answer 
     Failure/Error: expect(question_ra.right_answer).to eq(question_ra.answers.first)
     
       expected: #<Answer id: 1383, body: "Text of answer body #9", question_id: 736, created_at: "2016-05-15 15:54:58", updated_at: "2016-05-15 15:54:58", user_id: 2146, right_answer: false>
            got: nil
     
       (compared using ==)
     # ./spec/models/answer_spec.rb:40:in `block (5 levels) in <top (required)>'