CODEWITHSUNDEEP
ruby-on-railsactiverecordserializationtree
The Trav
The Trav

Reputation: 2005

How do I serialize an entire ActiveRecord Tree in Rails?

class Node < ActiveRecord::Base
  attr_accessible :name

  belongs_to :parent_node, :class_name => "Node", :foreign_key => :parent_id
  has_many :child_nodes, :class_name => "Node", :foreign_key => :parent_id
end

For the root node, parent_id will be nill. Say I have the id of the root node, and wish to print the entire tree to the output stream in json format.

How do I go about doing that?

Assume the tree does not contain any loops.

Upvotes: 2

Views: 922

Answers (1)

Zubin
Zubin

Reputation: 9712

Sounds like you need awesome_nested_set. The wiki is well documented but can be hard to find if you don't know it's there.

In your case, you'll want to do something like:

Node.root.self_and_descendants

Upvotes: 1

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