try to have a array of hash for put on jquery tre viewer...

travail.rb

class Travail < ActiveRecord::Base
  
  
  def to_tree
    Jbuilder.new do |build|
      build.hash(self, :title, :id)
    end
  end
  
end  

// controller/travails_controller.rb
class TravailsController < ApplicationController
  def show
      @comments = @travail.comments.with_state([:published])
    gon.sscat = @travail.descendants.to_tree   //failed
    gon.sscat = @travail.to_tree.descendants   //show array of array, but i would like array of hash data form => [{...}{...}...]
    print "***** ==>"
    print gon.sscat
    respond_to do |f|
      f.html
      f.xml { render :xml => @travail }
    end
  end
end

travails.coffee

$(document).on 'page:load page:update ready', ->
  $('#sous_categories').tree
    data: gon.sscat,
    autoOpen: true