如何使用无限子条目查看导航? [英] How to view navigation with infinit sub entries?

问题描述

我有一个名为Category的简单模型.该模型具有三个字段:name:string，parent_id:integer，并且原因为id！ parent_id是自我参照关联:

Ive got a simple Model called Category. The model is has three fields : name:string, parent_id:integer and of cause an id! The parent_id is an self referential association:

has_many :children, :class_name => 'Category', :foreign_key => 'parent_id'
belongs_to :parent, :class_name => 'Category', :foreign_key => 'parent_id'

因此，每个类别都可以具有子类别，并且不断增加，...这在数据库上不是问题，但是当涉及到视图时，我会感到困惑！

So every Category can have subcategories and on and on and on,... This isnt a problem at the database but when it comes to the view Im getting confused!

我不知道如何遍历每个类别children和那些孩子的孩子，...

I dont get how I can loop through each categories children and those childrens children,...

推荐答案

假设您拥有部分被调用的类别，则可以执行以下操作

Assuming you had a partial called category you could do something like this

%h2= category.name
%ul
  - category.children.each do |child|
    %li
      = render :partial => 'category', :object => child

我用过haml，但是在erb中会差不多.

I've used haml but it would be about the same in erb.

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