Question

我是Rspec和FactoryGirl的新手，用于测试ROR应用程序。我正在尝试测试一个模型类方法add_product(product_id)并且当我在浏览器上尝试相同时它仍然失败但它仍然有效。这是模型的代码：

class Cart < ActiveRecord::Base
  has_many :line_items, inverse_of: :cart

  def add_product(product_id)
    current_item = line_items.find_by_product_id(product_id)
    if current_item
      current_item.quantity += 1
    else
      current_item = line_items.build(:product_id => product_id)
    end
    current_item
  end
end

以下是购物车型号的失败规格：

describe Cart do
  before(:each) do
    @cart = FactoryGirl.create(:cart)
    @product = FactoryGirl.create(:product)
    @line_item = FactoryGirl.create(:line_item, product_id: @product.id, cart_id: @cart.id)
  end
  it 'increases the quantity of line_item when a similar product is added' do
    lambda {@cart.add_product(@product.id)}.should change {@line_item.quantity}.by(1)
  end
end

此操作失败，我从Rspec Failure/Error: lambda {@cart.add_product(@product.id)}.should change {@line_item.quantity}.by(1) result should have been changed by 1, but was changed by 0

收到此消息

Answer 1

数量正在更新，但您永远不会保留数据。因此，数据永远不会访问数据库，测试永远不会发生变化。你会遇到与.build相同的问题，直到你明确这么说才会持久存在。您可以通过执行此操作来更改此内容。

class Cart < ActiveRecord::Base
  has_many :line_items, inverse_of: :cart

  def add_product(product_id)
    current_item = line_items.find_by_product_id(product_id)
    if current_item
      current_item.quantity += 1
      current_item.save
    else
      current_item = line_items.create(:product_id => product_id)
    end
    current_item
  end
end

在Rails中使用Rspec和FactoryGirl测试模型的类方法

1 个答案: