EnhancedNestedForms
===================

Install
=======

  script/plugin install git://github.com/lassej/enhanced_nested_forms.git


Example
=======

Say you have two models:


  class Project < ActiveRecord::Base
    has_many :tasks

    accepts_nested_attributes_for :tasks
  end

  class Task < ActiveRecord::Base
    column :project_id

    belongs_to :project
  end


Without this plugin you either have to use javascript to add new tasks to a project or you must
insert some empty Task objects and use the :reject_if option of the accepts_netsted_attributes_for
method to prevent the empty objects from being saved. Both alternatives are quite ugly.

Using the enhanced_nested_forms plugin allows you to add a button to your form which triggers building
a new associated object and prevents the whole object tree from being saved.

  submit_tag "Add Task", :name => "project[_build_tasks]"

or

  image_submit_tag "plus.png", :name => "project[_build_tasks]"


The controller code can stay as it was. If a build-something button was clicked, a before_save callback
will return false and the form will be re-rendered with the unsaved object.

  def create
    @project = Project.new( params[:project])
    if @project.save
      redirect_to @project
    else
      render "new"
    end
  end

  def update
    @project = Project.find( params[:id])
    if @project.update_attributes( params[:project])
      redirect_to @project
    else
      render "new"
    end
  end


Helper methods for the view, more tests and documentation will follow.


Copyright (c) 2009 [Lasse Jansen], released under the MIT license