RESTful rails 应用程序的简单面包屑

class ApplicationController< ActionController::Base
  before_action :add_breadcrumb

  def add_breadcrumb(name = nil, url = nil)
    @breadcrumbs ||= []
    if name && url
      @breadcrumbs << { name: name, url: url }
    end
  end
end

<div class="breadcrumb">
  <ul>
    <li><%= link_to "Home", root_path %></li>
    <% @breadcrumbs.each do |crumb| %>
      <li><%= link_to crumb[:name], crumb[:url] %></li>
    <% end %>
  </ul>
</div>

class ProductsController< ApplicationController
  before_action :add_breadcrumb, only: [:index, :show]

  def index
    @products = Product.all
  end

  def show
    @product = Product.find(params[:id])
    add_breadcrumb @product.name, product_path(@product)
  end
end