Redis和Rails的Rspec測試失敗

Question

我重構了Rails代碼，將用戶關系存儲在Redis中，而不是Postgres數據庫中。

之前的代碼：

# user.rb

has_many :relationships, foreign_key: "follower_id", dependent: :destroy
has_many :following, through: :relationships, source: :followed

def follow!(other_user)
  relationships.create!(followed_id: other_user.id)
end

重構代碼：

# user.rb

def follow!(other_user)
  rdb.redis.multi do
    rdb[:following].sadd(other_user.id)
    rdb.redis.sadd(other_user.rdb[:followers], self.id)
  end
end

def following
  User.where(id: rdb[:following].smembers)
end

重構的代碼可以工作，但是我現有的規范現在失敗了：

describe "following a user", js: true do
  let(:other_user) { FactoryGirl.create(:user) }
  before { visit user_path(other_user) }

  it "should increment the following user count" do
    expect do
      click_button "Follow"
      page.find('.btn.following')
    end.to change(user.following, :count).by(1)
  end
end

現在導致：

Failure/Error: expect do
   count should have been changed by 1, but was changed by 0

Rspec使用不同的Redis數據庫，該數據庫在每個規范運行之前都會被刷新。 據我所知，該規范仍然應該通過。 我在這里想念什么嗎？

Answer 1

to change(user.followers, :count).by(1)

應該改為

to change(other_user.followers, :count).by(1)

Answer 2

這可能是重裝問題嗎？ 嘗試這個：

it "should increment the following user count" do
  expect do
    click_button "Follow"

    # user object is now stale, reload it from the DB
    user.reload
  end.to change(user.following, :count).by(1)
end