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所以我有一个应用程序范围的面包屑辅助方法，我在布局中使用，在所有视图页面中。

这是下面的方法

- 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

据我了解，视图中的变量应该是实例变量而不是方法，但是在视图中声明实例变量似乎并没有什么意义，但我不知道该怎么做，是否可以接受只是将其保留为方法调用breadcrumbs.each do，例如？那还能用吗？什么是最佳实践。

编辑（助手，以防万一）：

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
4

1 回答 1

2

助手是视图中包含的模块。它们不是通过实例变量访问的。

您应该能够直接在视图中访问帮助程序中定义的方法。所以与其写

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

你会写一些类似的东西

- breadcrumbs.each do |name, breadcrumb|

You will also probably want to capture the count of breadcrumbs before the loop, with something like

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

and replacing

@BreadcrumbsHelper.count

with

breadcrumbs_count
于 2013-10-16T01:34:18.913 回答