adding code from book

timriley · Jul 18, 2008 · e397c44 · e397c44
1 parent 65f95b2
commit e397c44
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Showing 7 changed files with 63 additions and 9 deletions.
diff --git a/README b/README
@@ -1,6 +1,6 @@
 Complex Form Examples
 ---------------------
 
-Several different ways to handle the multi-model form problem with a 
+This one is copied directly from the Advanced Rails Recipes book.
-one-to-many association. The various approaches are in git branches.
+
-See them for examples.
+http://www.pragprog.com/titles/fr_arr/advanced-rails-recipes
diff --git a/app/controllers/projects_controller.rb b/app/controllers/projects_controller.rb
@@ -9,6 +9,7 @@ def show
 
   def new
     @project = Project.new
+    @project.tasks.build
   end
 
   def create
@@ -26,6 +27,7 @@ def edit
   end
 
   def update
+    params[:project][:existing_task_attributes] ||= {}
     @project = Project.find(params[:id])
     if @project.update_attributes(params[:project])
       flash[:notice] = "Successfully updated project."

diff --git a/app/helpers/projects_helper.rb b/app/helpers/projects_helper.rb
@@ -1,2 +1,7 @@
 module ProjectsHelper
+  def add_task_link(name)
+    link_to_function name do |page|
+      page.insert_html :bottom, :tasks, :partial => 'task', :object => Task.new
+    end
+  end
 end
diff --git a/app/models/project.rb b/app/models/project.rb
@@ -1,4 +1,31 @@
 class Project < ActiveRecord::Base
-  has_many :tasks
+  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
diff --git a/app/views/layouts/application.html.erb b/app/views/layouts/application.html.erb
@@ -4,6 +4,7 @@
   <head>
     <title><%= h(yield(:title) || "Untitled") %></title>
     <%= stylesheet_link_tag 'application' %>
+    <%= javascript_include_tag :defaults %>
     <%= yield(:head) %>
   </head>
   <body>

diff --git a/app/views/projects/_form.html.erb b/app/views/projects/_form.html.erb
@@ -1,8 +1,16 @@
 <%= error_messages_for :project %>
-<% form_for @project do |f| %>
+
+<% form_for @project do |f| -%>
   <p>
-    <%= f.label :name %><br />
+    Name: <%= f.text_field :name %>
-    <%= f.text_field :name %>
   </p>
-  <p><%= f.submit "Submit" %></p>
+  <div id="tasks">
-<% end %>
+    <%= render :partial => 'task', :collection => @project.tasks %>
+  </div>
+  <p>
+    <%= add_task_link "Add a task" %>
+  </p>
+  <p>
+    <%= f.submit "Submit" %>
+  </p>
+<% end -%>
diff --git a/app/views/projects/_task.html.erb b/app/views/projects/_task.html.erb
@@ -0,0 +1,11 @@
+<div class="task">
+<% new_or_existing = task.new_record? ? 'new' : 'existing' %>
+<% prefix = "project[#{new_or_existing}_task_attributes][]" %>
+
+<% fields_for prefix, task do |task_form| -%>
+  <p>
+    Task: <%= task_form.text_field :name %>
+    <%= link_to_function "remove", "$(this).up('.task').remove()" %>
+  </p>
+<% end -%>
+</div>