CODEWITHSUNDEEP
ruby-on-railsrecursion
Sammy
Sammy

Reputation: 953

Recursion-Printing Parents and Children with indentation(haml)

I am trying to print parents' and children's name with indentation. But I am not sure how I can do that in the view.(haml)

I have a model with self join:(just to give you the structure, I also have other attributes etc. but I think they are irrelevant)

class Post < ActiveRecord::Base
  has_many :children,  :class_name => "Post"
  belongs_to :parent, :class_name => "Post", :foreign_key => "post_id"
end

So it has a hierarchy and I wanna have something like this(let's assume with the attribute 'name'):

Post 1
      Post 1.1
      Post 1.2
Post 2
      Post 2.1
              Post 2.2

I am pretty new in Ruby-on-rails. So please bear with me. I would really really appreciate if I could get a quite explanatory answer.

Thank you so much in advance, J

Upvotes: 0

Views: 759

Answers (1)

jvnill
jvnill

Reputation: 29599

you can use recursion. create a partial that calls itself.

# app/views/posts/_post.html.haml
= post.title
= post.content
= render partial: 'post', collection: post.children

I'm assuming that you have a posts controller which comes with a folder for it's views in app/views/posts. You need to create a partial there called _post.html.haml which calls itself. The render line tells you to render the same partial for each of the post's children.

the indentation can be handled via css.

Upvotes: 3

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