make-breadcrumb-list

get_breadcrumbs

def get_breadcrumbs
    url = request.url
    url_piecies = url.split("/")
    url_piecies.slice!(0,2)
    url_piecies[0].gsub!(/:/,'')

    layer_piecies = get_layer_piecies(url_piecies)
    layers = get_layers(layer_piecies)
  end

get_category_caption

def get_category_caption(url_piece, category)
    return Department.find(url_piece).name      if category == 'department'
    return Employee.find(url_piece).name        if category == 'employee'
    return ProductCategory.find(url_piece).name if category == 'category'
    return Product.find(url_piece).name         if category == 'product'
  end

get_layer_caption

def get_layer_caption(url_piece)
    layer_caption = { 'localhost3000' => "管理画面",
                   'personal'   => "部署一覧",
                   'department'    => '部署',
                   'employee'      => '社員',
                   'products'      => '商品カテゴリ一覧',
                   'category'      => 'タイプ',
                   'product'       => '商品'
                  }
    layer_caption[url_piece]
  end

get_layer_piecies

def get_layer_piecies(url_piecies)
    layer_piecies = []
    url_piecies.each do |url_piece|
      layer_caption = get_layer_caption(url_piece)
      if layer_caption == nil
        category_caption = get_category_caption(url_piece, layer_piecies.last[:url])
        layer_piecies.last[:caption] = layer_piecies.last[:caption] + "(#{category_caption})"
        layer_piecies.last[:url] = layer_piecies.last[:url] + "/#{url_piece}"
      else
        url_piece = '/' if url_piece == 'localhost3000'
        layer_piecies << { caption: layer_caption, url: url_piece }
      end
    end
    layer_piecies
  end

get_layers

def get_layers(layer_piecies)
    layers = []

    layer_url_piecies = []
    layer_piecies.each do |layer_piece|
      layer_url_piecies << layer_piece[:url]
    end

    layer_piecies.each_with_index do |layer_piece, i|
      url = layer_url_piecies[0..i].join('/')
      url.slice!(0,1) if url != '/'
      caption = layer_piece[:caption]
      layers << { caption: caption, url: url }
    end
    layers
  end

in_header

<% breadcrumbs = get_breadcrumbs %>
    <% breadcrumbs.each do |breadcrumb| %>
        <% class_name = 'breadcrumb'%>
        <% class_name += ' last' if breadcrumbs.last == breadcrumb %>
        <%= link_to "> " + breadcrumb[:caption], breadcrumb[:url], :class => class_name %>
    <% end %>

route.rb

BreadcrumbList::Application.routes.draw do
  root 'static_pages#home'

  match "/products", to: 'product_categories#index', via: 'get'
  match "/products/category/:id", to: 'products#index', via: 'get'
  match "/products/category/:category_id/product/:id", to: 'products#show', via: 'get'

  match '/personal', to: 'departments#index', via: 'get'
  match "/personal/department/:id", to: 'employees#index', via: 'get'
  match '/personal/department/:department_id/employee/:id', to: 'employees#show', via: 'get'

end