ActionController :: UrlGenerationError：缺少必需的键：[：id] [英] ActionController::UrlGenerationError: missing required keys: [:id]

问题描述

我正在运行RSpec 3测试，并且对于这一特定路径也遇到了相同的错误：

I'm running RSpec 3 tests and am getting this same error for this one particular path:

 Failure/Error: visit book_path
 ActionController::UrlGenerationError:
 No route matches {:action=>"show", :controller=>"books"} missing required keys: [:id]

我的测试还没有完成，所以我确定后面的一些代码可能不正确。但是我无法运行我的访问路径行：

My test isn't quite finished, so I'm sure some of the latter code might be incorrect. But I can't get my visit path line to run:

...
book = FactoryGirl.build(:book)
reviews = FactoryGirl.build_list(:review, 5, book: book)

visit book_path

reviews.each do |review|
  expect(page).to have_content(review.rating)
  expect(page).to have_content(review.body)
  expect(page).to have_content(review.timestamp)
end

  expect(page).to have_content('House of Leaves')
  expect(page).to have_content('Mark Z. Danielewski')
  expect(page).to have_content('Horror')
end

在我的控制器中，显示定义为：

In my controller, I have show defined as:

def show
  @book = Book.find(params[:id])
  @reviews = @book.reviews.order('created_at DESC')
  @review = Review.new
end

我的资源：

resources :books, only: [:index, :show, :new, :create] do
  resources :reviews, only: [:show, :new, :create] do
end

推荐答案

由于未定义要访问的书 ，因此引发了错误。丢失的键 id 是书的ID。因此，您应该将其更改为：

It's raising an error because you haven't defined which book you'd like to visit. The missing key, id, is the ID of the book. So you should change this to:

book = FactoryGirl.build(:book)
reviews = FactoryGirl.build_list(:review, 5, book: book)

visit book_path(book)

请注意，您可以直接传递ID（ book_path（book.id）），但是如果不这样做，Rails会从传递的对象中推断出它。

Note that you can pass in the ID directly (book_path(book.id)), but if you don't Rails will infer it from the object passed.

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