Rails中的Rspec測試失敗並顯示nilclass錯誤

Question

編輯：這是工作答案：

it "redirects to the show view for the object that was selected" do
  object_id = params[:object][:id]
  get :select, object: { id: object_id }
  expect(subject).to redirect_to object_path(params[:object][:id])
end

我在Rails應用程序中進行了rspec測試，但失敗了，我不知道為什么（rspec noob）。

我不應該使用Factory Girl，所以請不要給出依賴於此的答案。

這是控制器代碼：

def select
  redirect_to object_path(params[:object][:id])
end

這是引用從視圖中選擇的集合中選擇的對象：

<%= form_tag select_object_path, method: :get do %>
  <%= collection_select(:object, :id, Object.all, :id, :name, prompt: "Select One:") %>
  <br>
  <%= submit_tag "View Object" %>
<% end %>

測試代碼：

describe "GET #select" do
  let(:object) do
    Object.create(name: "Object Name", description: "This is an object")
  end

  let(:params) do
    {
    object: {
      id: "1",
      name: "An Object",
      description: "Object object"
      }
    }
  end

  it "redirects to the show view for the object that was selected" do
    object_id = params[:object][:id]
    get :select, id: object_id
    expect(subject).to redirect_to object_path
  end
end

錯誤信息：

Failures:

 1) ObjectsController GET #select redirects to the show view for the object that was selected
 Failure/Error: redirect_to object_path(params[:object][:id])

 NoMethodError:
   undefined method `[]' for nil:NilClass
 # ./app/controllers/objects_controller.rb:45:in `select'
 # ./spec/controllers/objects_controller_spec.rb:100:in `block (3 levels) in <top (required)>'

我嘗試了許多不同的測試，但似乎沒有通過。 似乎認為params [：object] [：id]為nil，但我不知道為什么應該等於1。有人可以解釋我在做什么嗎？

使用了該網站並驗證了該功能似乎可以正常工作，但我只是想不出如何對其進行測試。 參數看起來像這樣：

“對象”=> { “ID”=> “1”}

Answer 1

get :select, id: object_id

您發出GET請求，並傳遞id = 1作為參數。

redirect_to object_path(params[:object][:id])

在select操作中，您嘗試從object參數獲取此ID，但沒有發送它。 因此，您調用params[:object]並得到nil 。 然后調用nil[:id]並獲取異常。

要解決此問題，請像下面這樣傳遞參數：

get :select, object: { id: object_id }

或直接獲取ID：

redirect_to object_path(params[:id])