在Rails 4应用程序中显示两种类型的货币

Question

我正在构建一个rails e commerce app，我的所有价格都是以美元计价，但现在我的客户想要以欧元显示价格。

客户希望能够为每种货币设定不同的价格，因此我无法将美元金额与欧元兑美元汇率挂钩以显示价格。

换句话说，客户必须能够输入两个输入价格，一个用于美元，一个用于欧元，然后显示在产品页面上。

我想要做的唯一方法是向数据库添加另一列并将其称为price_euros或类似的东西。

由于我缺乏经验，我想在这里询问是否有另一种更简单的方法可以做到这一点？

提前致谢 d

这是views / products

中的show.html.erb

<div class="row product_top">

    <div class="container">

    <% breadcrumb :products %>

    <div class="col-xs-12 col-sm-6 center-block">


     <div class="product_description">

        <h3><%= @product.name %></h3>
        <h4><%#=@product.material %></h4>
        <p><%= @product.description %></p>
        <p class="price"> Designer: </p>
        <p><%= @product.designer.designer_name %></p>

        <p>In stock: <%= @product.stock_quantity %> </p>
     </div>
        <div class="col-xs-12">
         <p> Price: <%= number_to_currency @product.price, class: 'price' %></p>
        </div>
        <div class="row add_to_cart">   
            <p><%= link_to 'Add to cart', add_cart_path, method: :post %></p>
        </div>


    </div>


   <div class="col-xs-12 col-sm-6 center-block" >

  <%= image_tag @product.image.url(:medium), class: "img-responsive"  %>



  </div>
    <p>
  <% if current_user && current_user.admin? %>
   <%= link_to 'Edit', edit_product_path(@product) %> |
  <% end %>
   <%= link_to 'Back',  root_path %>
  </p>


  </div>  

</div>

这是管理员输入价格的_form.html.erb部分

<%= form_for @product, multipart: true do |f| %>
  <% if @product.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@product.errors.count, "error") %> prohibited this product from being saved:</h2>

      <ul>
      <% @product.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
      </ul>
    </div>
  <% end %>
<div class="container">
      <div class="form-group">
          <%= f.label :name %><br>
          <%= f.text_field :name, class: "form-control", rows: "5" %>
      </div>
      <div class="form-group">
          <%= f.label :designer %><br>
          <%= f.select :designer_id, Designer.all.map { |c| [ c.designer_name, c.id ] } %>

      </div>
      <div class="form-group">
          <%= f.label :description %><br>
          <%= f.text_area :description, class: "form-control", rows: "5"  %>
      </div>
      <div class="form-group">
         <%= f.label :price %><br>
         <%= f.text_field :price %>
      </div>
      <div class="form-group">
         <%= f.label :image %><br>
         <%= f.file_field :image %>
      </div>

     <div class="form-group">
         <%= f.label :stock_quantity %><br>
          <%= f.number_field :stock_quantity %>
      </div>

      <div class="form-group">
          <%= f.label :category %><br>
          <%= f.select :category_id, Category.all.map { |c| [ c.name, c.id ] } %>
       </div>
        <div class="actions">
          <%= f.submit %>
        </div>
  <% end %>
</div>

这是我的产品型号product.rb

class Product < ActiveRecord::Base


    mount_uploader :image, ImageUploader



    validates_presence_of :name, :price, :stock_quantity
    validates_numericality_of :price, :stock_quantity

    belongs_to :designer
    belongs_to :category
    belongs_to :page

    def self.search(query)

     where("name LIKE ? OR description LIKE ?", "%#{query}%", "%#{query}%") 
    end


end

这是product_controller.rb

class ProductsController < ApplicationController
  before_action :set_product, only: [:show, :edit, :update, :destroy]
  before_filter :initialize_cart
  before_action :authenticate_admin!, only: [ :new, :edit, :update, :create, :destroy ]
  # GET /products
  # GET /products.json
  def index
    @products = Product.all
  end

  def search

    @products = Product.search(params[:query]).order("created_at DESC")
    @categories = Category.joins(:products).where(:products => {:id => @products.map{|x| x.id }}).distinct

  end

  # GET /products/1
  # GET /products/1.json
  def show

  end

  # GET /products/new
  def new
    @product = Product.new
  end

  # GET /products/1/edit
  def edit

  end

  # POST /products
  # POST /products.json
  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
  end

  # PATCH/PUT /products/1
  # PATCH/PUT /products/1.json
  def update
    respond_to do |format|
      if @product.update(product_params)
        format.html { redirect_to @product, notice: 'Product was successfully updated.' }
        format.json { render :show, status: :ok, location: @product }
      else
        format.html { render :edit }
        format.json { render json: @product.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /products/1
  # DELETE /products/1.json
  def destroy
    @product.destroy
    respond_to do |format|
      format.html { redirect_to products_url, notice: 'Product was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_product
      @product = Product.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def product_params
      params.require(:product).permit(:name, :description, :price, :image, :category_id, :stock_quantity, :designer_id, :query)
    end
end