Ruby on Rails 中的面包屑导航
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Breadcrumbs in Ruby on Rails
提问by Michael Schmitz
I'm slightly insecure about my breadcrumb solution. Names and links are defined in each controller action:
我对我的面包屑解决方案有点不安全。名称和链接在每个控制器操作中定义：
<a href="http://localhost:3000/">Home</a>
<% if defined? @l1_link %>
> <a href="<%= @l1_link%>"><%= @l1_name %></a>
<% if defined? @l2_link %>
> <a href="<%= @l2_link%>"><%= @l2_name %></a>
<% end %>
<% end %>
This way I can use:
这样我可以使用：
@l1_link = user_path()
Question: As I am not that smart - could this kind of system lead to desaster somewhere down the road? Is this (grossly) inefficient?
问题：由于我不是那么聪明——这种系统会导致未来某个地方的灾难吗？这（严重）效率低下吗？
采纳答案by Christopher Creutzig
This is mostly a matter of opinion, but anyway:
这主要是一个意见问题，但无论如何：
- I would not want that much logic in a view. We've probably all done it, but it gets messy quickly.
- The code is not safe against future changes that affect the depth of the tree.
- Instead of linked variables
*_nameand*_link, I'd suggest using proper objects anyway, with somelink_tofunctionality.
- 我不希望在视图中有那么多逻辑。我们可能都做过，但很快就会变得一团糟。
- 该代码对于影响树深度的未来更改是不安全的。
- 无论如何，我建议使用具有某些功能的适当对象，而不是链接变量
*_nameand 。*_linklink_to
You might find Episode 162 of Railscastsof interest for a nice solution that gets by with
您可能会发现感兴趣的 Railscasts 第 162 集，这是一个很好的解决方案
<% for page in @page.ancestors.reverse %>
<%= link_to h(page.name), page %> >
<% end %>
回答by Simone Carletti
Breadcrumbs menu are a recurrent pattern in most Rails applications. To solve this issue, I created and released a plugin called breadcrumbs_on_rails.
面包屑菜单是大多数 Rails 应用程序中的循环模式。为了解决这个问题，我创建并发布了一个名为breadcrumbs_on_rails的插件。
You define your breadcrumbs in the controller
您在控制器中定义面包屑
class MyController
add_breadcrumb "home", root_path
add_breadcrumb "my", my_path
def index
# ...
add_breadcrumb "index", index_path
end
end
and you render them in your view.
然后在您的视图中呈现它们。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>untitled</title>
</head>
<body>
<%= render_breadcrumbs %>
</body>
</html>
Even if you don't want to use a plugin, I encourage you to give it a look. It's open source and you can grab some idea for your app.
即使您不想使用插件，我也鼓励您看一看。它是开源的，您可以为您的应用程序获取一些想法。
回答by Lasse Bunk
I made a gem named Gretelthat is a Ruby on Rails plugin for creating breadcrumbs. The breadcrumbs are configured in a separate configuration file and selected in the view.
我制作了一个名为Gretel的 gem ，它是一个用于创建面包屑的 Ruby on Rails 插件。面包屑在单独的配置文件中配置并在视图中选择。
Example config/breadcrumbs.rb:
示例config/breadcrumbs.rb：
crumb :root do
link "Home", root_path
end
crumb :projects do
link "Projects", projects_path
end
crumb :project do |project|
link project.name, project_path(project)
parent :projects
end
crumb :project_issues do |project|
link "Issues", project_issues_path(project)
parent :project, project
end
crumb :issue do |issue|
link issue.name, issue_path(issue)
parent :project_issues, issue.project
end
In your view:
在您看来：
<% breadcrumb :issue, @issue %>
In your app/views/layouts/application.html.erb:
在您的 app/views/layouts/application.html.erb 中：
<%= breadcrumbs pretext: "You are here: " %>
回答by user1449337
Do not use any plugins just for breadcrumbs. This link provides an efficient method to generate breadcrumbs.
不要只为面包屑使用任何插件。此链接提供了一种生成面包屑的有效方法。
http://szeryf.wordpress.com/2008/06/13/easy-and-flexible-breadcrumbs-for-rails/
http://szeryf.wordpress.com/2008/06/13/easy-and-flexible-breadcrumbs-for-rails/
Although, it is a very old post, it still works.
虽然这是一个很老的帖子，但它仍然有效。
回答by sekrett
I did a fork of crumblegem. It has very few configuration options and it appears abandoned, but when I tried to switch to breadcrumbs_on_railsor gretel, I realized that I have to add many lines to my views or controllers (and I have a lot of them), but with crumbleit is all stored in one configuration file. If you like to do some patches and prefer configuration in one place, I think it is the best solution ever.
我做了一个crumble宝石叉。它的配置选项很少，似乎被放弃了，但是当我尝试切换到breadcrumbs_on_railsor 时gretel，我意识到我必须向我的视图或控制器添加许多行（而且我有很多），但是crumble所有这些都被存储了在一个配置文件中。如果你喜欢做一些补丁并且喜欢在一个地方配置，我认为这是有史以来最好的解决方案。
回答by Happynoff
You could also use Ariane http://github.com/simonc/ariane
你也可以使用 Ariane http://github.com/simonc/ariane
With it you can generate any kind of breadcrumb, as links in a paragraph or as a ul/li :)
有了它，您可以生成任何类型的面包屑，作为段落中的链接或作为 ul/li :)
If you want something specific, you can create your own renderer.
如果你想要一些特定的东西，你可以创建自己的渲染器。
It's pretty simple to use, just add this in a before_filter:
使用起来非常简单，只需将其添加到before_filter：
ariane.add 'Home', root_path # in the app controller to have it everywhere
ariane.add 'Some Page', some_path
