ruby-on-rails – Nil不是Rspec的象征

当我运行测试时,我收到此错误：

1) Posts when logged in should delete posts
     Failure/Error: expect{click_on "Usuń spot"}.to change(Post.count).by(1)
     TypeError:
       nil is not a symbol

posts_spec.rb

describe "when logged in" do
    let(:user) {FactoryGirl.create(:user)}
    let!(:post) {user.posts.create(content: "Brilliant! I just saw the most amazing ever. She looked so cute!")}
    content = "Example of spot post,for TDD. It's not real spot. Not yet."

    before(:each) {
      log_user(user)
    }

    it "should delete posts" do
      visit user_post_path(user,post)
      expect{click_on "Usuń spot"}.to change(Post.count).by(1)
    end

show.haml

=@post.content
=link_to "Usuń spot",[@user,@post],method: :delete

posts_controller.rb

def show
    @user = current_user
    @post = @user.posts.find(params[:id])
  end

  def destroy
    @user = current_user
    @post = @user.posts.find_by_id(params[:id])
    @post.destroy

    flash[:success] = "Post destroyed"

    redirect_to root_url
  end