Single Inheritance Table(SIT) with chronosmodel and closure_tree

README.txt

filtered_params in Publications_controller are a method that return only important columns of model. In this case Publication as example


Basic Gems
https://github.com/mceachen/closure_tree
https://github.com/ifad/chronomodel

element.rb

class Element < ActiveRecord::Base
  include ChronoModel::TimeMachine
  attr_accessible :title, :specs, :position, :parent_id

  acts_as_tree :name_column => 'title', :dependent => :destroy, :order => 'sort_order'
end

publication.rb

class Publication < Element
   attr_accessible :max_wordcount, :user_ids
end

publications_controller.rb

class PublicationsController < ApplicationController

  def create

    @publication = Publication.new(filtered_params)

    if @publication.save
      render json: @publication, status: :created, location: @publication
    else
      render json: @publication.errors, status: :conflict
    end

  end


  def show
    @publication = Publication.find(params[:id])
    @publication.history.all

    render json: @publication
  end

  def update
    @publication = Publication.find(params[:id])

    if @publication.update_attributes filtered_params
      render json: @publication, status: :ok
    else
      render json: @publication.errors, status: :conflict
    end
  end

  def destroy
    @publication = Publication.find(params[:id])
    @publication.destroy

    head :no_content
  end
  
  def filtered_params
    filtered = {}
    keys = model(true).accessible_attributes
    params[model_underscore].each do |key, value|
      filtered[key.to_sym] = value if keys.include?(key.to_sym)
    end
    filtered
  end

end

schema.rb

# encoding: UTF-8
# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# Note that this schema.rb definition is the authoritative source for your
# database schema. If you need to create the application database on another
# system, you should be using db:schema:load, not running all the migrations
# from scratch. The latter is a flawed and unsustainable approach (the more migrations
# you'll amass, the slower it'll run and the greater likelihood for issues).
#
# It's strongly recommended to check this file into your version control system.

ActiveRecord::Schema.define(:version => 20121226190809) do

  create_table "element_hierarchies", :primary_key => "__chrono_id", :force => true, :temporal => true do |t|
    t.integer "ancestor_id",   :null => false
    t.integer "descendant_id", :null => false
    t.integer "generations",   :null => false
  end

  add_index "element_hierarchies", ["ancestor_id", "descendant_id"], :name => "index_element_hierarchies_on_ancestor_id_and_descendant_id", :unique => true
  add_index "element_hierarchies", ["descendant_id"], :name => "index_element_hierarchies_on_descendant_id"

  create_table "elements", :force => true, :temporal => true do |t|
    t.string   "title",         :default => ""
    t.text     "specs",         :default => ""
    t.string   "type",          :default => ""
    t.integer  "parent_id"
    t.datetime "created_at",                       :null => false
    t.datetime "updated_at",                       :null => false
    t.integer  "status",        :default => 0
    t.text     "text",          :default => ""
    t.integer  "sort_order",    :default => 0
    t.integer  "project_id"
    t.string   "rationale",     :default => ""
    t.string   "standards",     :default => ""
    t.string   "dok",           :default => ""
    t.string   "rnr",           :default => ""
    t.string   "copyspace",     :default => ""
    t.string   "blanks",        :default => ""
    t.boolean  "is_correct",    :default => false
    t.integer  "asset_id"
    t.string   "size",          :default => ""
    t.text     "caption",       :default => ""
    t.text     "labels",        :default => ""
    t.text     "source",        :default => ""
    t.text     "original_data", :default => ""
    t.integer  "max_wordcount"
  end

end