#Project controller
class ProjectsController < ApplicationController
def index
@projects = Project.find(:all)
end
def new
@project = Project.new
@project.tasks.build
end
def create
@project = Project.new(params[:project])
if @project.save
flash[:notice] = “Successfully created project and tasks.”
redirect_to projects_path
else
render :action => ‘new’
end
end
def edit
@project = Project.find(params[:id])
end
def update
params[:project][:existing_task_attributes] ||= {}
@project = Project.find(params[:id])
if @project.update_attributes(params[:project])
flash[:notice] = “Successfully updated project and tasks.”
redirect_to project_path(@project)
else
render :action => ‘edit’
end
end
end
#Project.rb
class Project < ActiveRecord::Base
has_many :tasks, :dependent => :destroy
validates_presence_of :name
validates_associated :tasks
after_update :save_tasks
def new_task_attributes=(task_attributes)
task_attributes.each do |attributes|
tasks.build(attributes)
end
end
def existing_task_attributes=(task_attributes)
tasks.reject(&:new_record?).each do |task|
attributes = task_attributes[task.id.to_s]
if attributes
task.attributes = attributes
else
tasks.delete(task)
end
end
end
def save_tasks
tasks.each do |task|
task.save(false)
end
end
end
#Project/_task.html.erb
<% @task = task %>
<%= error_messages_for :task %>
Task: <%= task_form.text_field :name %> <%= link_to_function "remove", "$(this).up('.task').remove()" %>
<% end %>#Project/edit.html.erb
<% form_for :project, :url => project_path(@project), :html => { :method
=> ‘put’ } do |f| %>
<%= render :partial => ‘fields’, :locals => { :f => f } %>
<%= submit_tag "Update Project" %>
<% end %>#Project/_fields.html.erb
<%= error_messages_for :project %>
Name: <%= f.text_field :name %>
<%= link_to_function('Add') do |page| page.visual_effect :highlight, 'tasks' end%>
#Project/show.html.erb
<%= link_to ‘Edit’, edit_project_path(@project) %> |
<%= link_to ‘Back’, projects_path %>
#projects/new.html.erb
<% form_for :project, :url => projects_path do |f| %>
<%= render :partial => ‘fields’, :locals => { :f => f } %>
<%= submit_tag "Create Project" %>
<% end %>#project_helper
module ProjectsHelper
def fields_for_task(task, &block)
prefix = task.new_record? ? ‘new’ : ‘existing’
fields_for(“project[#{prefix}_task_attributes][]”, task, &block)
end
def add_task_link(name)
link_to_function name do |page|
page.insert_html :bottom, :tasks, :partial => ‘task’, :object =>
Task.new
end
end
end
#Task.rb
class Task < ActiveRecord::Base
belongs_to :project
validates_presence_of :name
end