#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 %>
<div class="task"> <% fields_for_task(task) do |task_form| %> <p> Task: <%= task_form.text_field :name %> <%= link_to_function "remove", "$(this).up('.task').remove()" %> </p> <% end %> </div>
#Project/edit.html.erb
<% form_for :project, :url => project_path(@project), :html => { :method => 'put' } do |f| %> <%= render :partial => 'fields', :locals => { :f => f } %> <p><%= submit_tag "Update Project" %></p> <% end %>
#Project/_fields.html.erb
<%= error_messages_for :project %> <p> Name: <%= f.text_field :name %> </p> <div id="tasks"> <%= render :partial => 'task', :collection => @project.tasks %> </div> <p> <%= link_to_function('Add') do |page| page.visual_effect :highlight, 'tasks' end%> </p>
#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 } %> <p><%= submit_tag "Create Project" %></p> <% 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
