Ruby on Rails-更改Hash價格的值

Question

我正在通過Active reocrd獲取所有產品

@results = Product.all

現在，我想將每個“價格”值乘以“價格* 100”，該怎么做？

Answer 1

@results = Product.all.select("*, `price` * 100 AS `price`")

要么

class Product < ActiveRecord::Base
  def price
    super * 100
  end
end

要么

class Product < ActiveRecord::Base
  def cents
    price * 100
  end
end

Answer 2

將虛擬屬性添加到app / models / product.rb

class Product < ActiveRecord::Base
  ...

  def price_in_cents  # or some other appropriate name
    price * 100
  end
  ...
end

並將其用作@ results.first.price_in_cents之類的東西