rails「rake test」錯誤「param is missing」。

我有一些麻煩測試我的rails應用程序。我只是在學習如何測試，所以我認爲這對你來說應該不成問題。我對這款產品的架構：rails「rake test」錯誤「param is missing」。

create_table "products", force: :cascade do |t| 
    t.string "title" 
    t.text  "description" 
    t.string "image_url" 
    t.decimal "price" 
    t.datetime "created_at", null: false 
    t.datetime "updated_at", null: false 
end

這種模式：

class Product < ActiveRecord::Base 
    validates :title, :description, :image_url, presence: true 
    validates :price, numericality: {greater_than_or_equal_to: 0.01} 
    validates :title, uniqueness: true 
    validates :image_url, allow_blank: true, format: { 
    with: %r{\.(gif|jpg|png)\Z}i, 
    message: 'must be a URL for GIF, JPG or PNG image.' 
    } 
end

與此控制器：

#some lines omitted... 
    def create 
    @product = Product.new(product_params) 
    respond_to do |format| 
    if @product.save 
     format.html { redirect_to @product, notice: 'Product was successfully created.' } 
    format.json { render :show, status: :created, location: @product } 
    else 
    format.html { render :new } 
    format.json { render json: @product.errors, status: :unprocessable_entity } 
    end 
end 
private 
def product_params 
    params.require(:product).permit(:title, :description, :image_url, :price) 
end

所以，我乳寧這個測試：

setup do 
    @product = products(:one) 
    @update = { 
    title: 'Lorem Ipsum', 
    description: 'Wibbles are fun!', 
    image_url: 'lorem.jpg', 
    price: 19.95 
} 
end 

test "should create product" do 
    assert_difference('Product.count') do 
    process :create, method: :post, params: @update 
end

但是我得到0次失敗與1呃ROR。

Error: 
ProductsControllerTest#test_should_create_product: 
ActionController::ParameterMissing: param is missing or the value is empty: product 
app/controllers/products_controller.rb:72:in `product_params' 
app/controllers/products_controller.rb:27:in `create' 
test/controllers/products_controller_test.rb:30:in `block (2 levels) in <class:ProductsControllerTest>' 
test/controllers/products_controller_test.rb:29:in `block in <class:ProductsControllerTest>'

我必須說，我只是升級軌4.2到5.0.0.1。我正在關注「使用rails 5進行敏捷開發」一書，但是如果我像書中所說的那樣做，測試就不起作用，我猜測自從本書寫作以來，rails已經發生了一些變化。我試圖在很多方面做到這一點，但我無法弄清楚。我究竟做錯了什麼？

感謝您的幫助！

來源

2017-04-12 Peyu

我的猜測是，@update有看起來像這樣

@update = { 
    product: { 
    title: 'Lorem Ipsum', 
    description: 'Wibbles are fun!', 
    image_url: 'lorem.jpg', 
    price: 19.95 
    } 
}

來源

2017-04-12 15:46:00 Iceman

rails「rake test」錯誤「param is missing」。

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