Question

以下是我的HomeController：

def index
  @products = Product.public_active
                     .order('random()')
                     .limit(6)
                     .includes(:product_attachments)
                     .includes(:product_reviews)

  @products.each do |product|
    if product.currency != session[:currency]
      if session["currency-convert-#{product.currency}"].to_f == 0.0
        rate = 1.0  
      else
        rate = session["currency-convert-#{session[:currency]}"].to_f / 
               session["currency-convert-#{product.currency}"].to_f
      end
    else
      rate = 1.0
    end

    product.price_with_currency = 300.00
    product.current_currency = session[:currency]
  end
end

这是我的观点：

<div id="product-list">
                <div class="row">
<p class="price"><%= product.price_with_currency %></p>
</div>
</div>

问题是price_with_currency输出300.0而非300.00的结果。为什么会这样？谢谢！

Answer 1

您可以使用名为number_with_precision

的帮助程序

它看起来像这样：

<p class="price"><%= number_with_precision(product.price_with_currency, :precision => 2) %></p>

在此处阅读更多内容：Rails 3. How to display two decimal places in edit form?

Answer 2

尝试使用两者：

<p class="price"><%= number_with_precision(product.price_with_currency, precision: 2) %></p>

OR

<p class="price"><%= number_to_currency(product.price_with_currency, unit: "USD", precision: 2) %></p>

如果你想要货币：D喜欢这个USD 3,000.00 #if 3000

Answer 3

您也可以使用number_to_currency帮助

例如。

<%= number_to_currency(300, :unit => "$ ", :separator => ".", :delimiter => ",") %>

## Output
$ 300.00

Rails货币有2个小数

3 个答案: