設置輔助方法返回值作爲實例變量

Question

因此，我有一個應用程序範圍的麪包屑幫助器方法，我在佈局中使用了所有視圖頁面。

這裏是低於

- if request.fullpath != '/' 
     .row 
      .col-md-12 
       #breadcrumbs 
        = link_to 'home', '/' 
        %span » 
        - @BreadcrumbsHelper = breadcrumbs 
        - i = 0 
        - @BreadcrumbsHelper.each do |name, breadcrumb| 
         = link_to name, breadcrumb 
         - if i != (@BreadcrumbsHelper.count - 1) 
          %span » 
         - i = i + 1  

方法從我的理解，在視圖中的變量應該是實例變量，而不是方法，但是聲明實例變量視圖並沒有真正似乎是有道理的，但我不確定還有其他方法可以接受，只是將它作爲方法調用，例如breadcrumbs.each do？這甚至會工作嗎？最佳做法是什麼？

EDIT（助手，以防萬一它有助於）：

module BreadcrumbsHelper 
    def breadcrumbs 
     current_path = request.fullpath 
     noparam_path = current_path.split('?') 

     path_parts = noparam_path[0].split('/') 

     path_parts.shift 

     counter = path_parts.size 
     new_paths = Hash.new 

     counter.times do 
      new_path = "" 
      path_name = "" 
      i = 0 

      path_parts.each do |part| 
       if i < counter 
        if new_path == "" 
         new_path = '/' + part 
        else 
         new_path = new_path + '/' + part 
        end 

        path_name = part 
        i = i + 1 
       end 
      end 

      counter = counter -1 

      #path functions 

      def routeValid(new_path) 
       route = "/" + new_path.gsub("_","/") 

       route_valid = true 
       begin 
        Rails.application.routes.recognize_path(route, :method => :get) 
       rescue 
        # error means that your route is not valid, so do something to remember that here 
        route_valid = false 
       end 
       return route_valid 
      end 

      def processPath(new_path, path_name, new_paths) 
       if routeValid(new_path) == true 
        #Optional Overrides 
        if path_name == "signup" 
         path_name = "sign up" 
        end 

        new_paths[path_name] = new_path 
       end 
      end 

      processPath(new_path, path_name, new_paths) 

     end 

     new_paths = Hash[new_paths.to_a.reverse] 

     return new_paths 

    end 
end 

Answer 1

助手是被包含在視圖的模塊。它們不通過實例變量訪問。

您應該能夠直接在視圖中訪問在助手中定義的方法。因此，而不是寫

- @BreadcrumbsHelper = breadcrumbs 
- i = 0 
- @BreadcrumbsHelper.each do |name, breadcrumb| 

你只是喜歡寫東西

- breadcrumbs.each do |name, breadcrumb| 

你也可能會想要捕捉的循環前的麪包屑的計數，喜歡的東西

- my_breadcrumbs = breadcrumbs 
- breadcrumbs_count = my_breadcrumbs.size 
- my_breadcrumbs.each do |name, breadcrumb| 

和替換

@BreadcrumbsHelper.count 

與

breadcrumbs_count