adding Rails 3 app based on Railscasts episodes 196 and 197

.gitignore

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+.bundle
+db/*.sqlite3
+log/*.log
+tmp/

.rvmrc

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+rvm 1.9.2@complex-form-examples --create

Gemfile

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+source 'http://rubygems.org'
+
+gem 'rails', '3.0.4'
+gem 'sqlite3'
+gem 'nifty-generators'
+gem "mocha", :group => :test

Gemfile.lock

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+GEM
+  remote: http://rubygems.org/
+  specs:
+    abstract (1.0.0)
+    actionmailer (3.0.4)
+      actionpack (= 3.0.4)
+      mail (~> 2.2.15)
+    actionpack (3.0.4)
+      activemodel (= 3.0.4)
+      activesupport (= 3.0.4)
+      builder (~> 2.1.2)
+      erubis (~> 2.6.6)
+      i18n (~> 0.4)
+      rack (~> 1.2.1)
+      rack-mount (~> 0.6.13)
+      rack-test (~> 0.5.7)
+      tzinfo (~> 0.3.23)
+    activemodel (3.0.4)
+      activesupport (= 3.0.4)
+      builder (~> 2.1.2)
+      i18n (~> 0.4)
+    activerecord (3.0.4)
+      activemodel (= 3.0.4)
+      activesupport (= 3.0.4)
+      arel (~> 2.0.2)
+      tzinfo (~> 0.3.23)
+    activeresource (3.0.4)
+      activemodel (= 3.0.4)
+      activesupport (= 3.0.4)
+    activesupport (3.0.4)
+    arel (2.0.8)
+    builder (2.1.2)
+    erubis (2.6.6)
+      abstract (>= 1.0.0)
+    i18n (0.5.0)
+    mail (2.2.15)
+      activesupport (>= 2.3.6)
+      i18n (>= 0.4.0)
+      mime-types (~> 1.16)
+      treetop (~> 1.4.8)
+    mime-types (1.16)
+    mocha (0.9.12)
+    nifty-generators (0.4.5)
+    polyglot (0.3.1)
+    rack (1.2.1)
+    rack-mount (0.6.13)
+      rack (>= 1.0.0)
+    rack-test (0.5.7)
+      rack (>= 1.0)
+    rails (3.0.4)
+      actionmailer (= 3.0.4)
+      actionpack (= 3.0.4)
+      activerecord (= 3.0.4)
+      activeresource (= 3.0.4)
+      activesupport (= 3.0.4)
+      bundler (~> 1.0)
+      railties (= 3.0.4)
+    railties (3.0.4)
+      actionpack (= 3.0.4)
+      activesupport (= 3.0.4)
+      rake (>= 0.8.7)
+      thor (~> 0.14.4)
+    rake (0.8.7)
+    sqlite3 (1.3.3)
+    thor (0.14.6)
+    treetop (1.4.9)
+      polyglot (>= 0.3.1)
+    tzinfo (0.3.24)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  mocha
+  nifty-generators
+  rails (= 3.0.4)
+  sqlite3

README.md

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+# Complex Form Examples
+
+This repository currently contains one Rails 3 example of a complex nested model form which is based off of Railscasts episodes 196 & 197. Expect more variations to come.
+
+If you want to see the Rails 2 examples, check out the "rails2" branch.

Rakefile

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+# Add your own tasks in files placed in lib/tasks ending in .rake,
+# for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
+
+require File.expand_path('../config/application', __FILE__)
+require 'rake'
+
+Surveyor::Application.load_tasks

app/controllers/application_controller.rb

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+class ApplicationController < ActionController::Base
+  protect_from_forgery
+end

app/controllers/surveys_controller.rb

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+class SurveysController < ApplicationController
+  def index
+    @surveys = Survey.all
+  end
+
+  def show
+    @survey = Survey.find(params[:id])
+  end
+
+  def new
+    @survey = Survey.new
+    3.times do
+      question = @survey.questions.build
+      4.times { question.answers.build }
+    end
+  end
+
+  def create
+    @survey = Survey.new(params[:survey])
+    if @survey.save
+      redirect_to @survey, :notice => "Successfully created survey."
+    else
+      render :action => 'new'
+    end
+  end
+
+  def edit
+    @survey = Survey.find(params[:id])
+  end
+
+  def update
+    @survey = Survey.find(params[:id])
+    if @survey.update_attributes(params[:survey])
+      redirect_to @survey, :notice  => "Successfully updated survey."
+    else
+      render :action => 'edit'
+    end
+  end
+
+  def destroy
+    @survey = Survey.find(params[:id])
+    @survey.destroy
+    redirect_to surveys_url, :notice => "Successfully destroyed survey."
+  end
+end

app/helpers/application_helper.rb

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+module ApplicationHelper
+  def link_to_remove_fields(name, f)
+    f.hidden_field(:_destroy) + link_to_function(name, "remove_fields(this)")
+  end
+
+  def link_to_add_fields(name, f, association)
+    new_object = f.object.class.reflect_on_association(association).klass.new
+    fields = f.fields_for(association, new_object, :child_index => "new_#{association}") do |builder|
+      render(association.to_s.singularize + "_fields", :f => builder)
+    end
+    link_to_function(name, "add_fields(this, \"#{association}\", \"#{escape_javascript(fields)}\")")
+  end
+end

app/helpers/error_messages_helper.rb

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+module ErrorMessagesHelper
+  # Render error messages for the given objects. The :message and :header_message options are allowed.
+  def error_messages_for(*objects)
+    options = objects.extract_options!
+    options[:header_message] ||= I18n.t(:"activerecord.errors.header", :default => "Invalid Fields")
+    options[:message] ||= I18n.t(:"activerecord.errors.message", :default => "Correct the following errors and try again.")
+    messages = objects.compact.map { |o| o.errors.full_messages }.flatten
+    unless messages.empty?
+      content_tag(:div, :class => "error_messages") do
+        list_items = messages.map { |msg| content_tag(:li, msg) }
+        content_tag(:h2, options[:header_message]) + content_tag(:p, options[:message]) + content_tag(:ul, list_items.join.html_safe)
+      end
+    end
+  end
+
+  module FormBuilderAdditions
+    def error_messages(options = {})
+      @template.error_messages_for(@object, options)
+    end
+  end
+end
+
+ActionView::Helpers::FormBuilder.send(:include, ErrorMessagesHelper::FormBuilderAdditions)

app/helpers/layout_helper.rb

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+# These helper methods can be called in your template to set variables to be used in the layout
+# This module should be included in all views globally,
+# to do so you may need to add this line to your ApplicationController
+#   helper :layout
+module LayoutHelper
+  def title(page_title, show_title = true)
+    content_for(:title) { h(page_title.to_s) }
+    @show_title = show_title
+  end
+
+  def show_title?
+    @show_title
+  end
+
+  def stylesheet(*args)
+    content_for(:head) { stylesheet_link_tag(*args) }
+  end
+
+  def javascript(*args)
+    content_for(:head) { javascript_include_tag(*args) }
+  end
+end

app/helpers/surveys_helper.rb

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+module SurveysHelper
+end

app/models/answer.rb

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+class Answer < ActiveRecord::Base
+  belongs_to :question
+end

app/models/question.rb

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+class Question < ActiveRecord::Base
+  belongs_to :survey
+  has_many :answers, :dependent => :destroy
+  accepts_nested_attributes_for :answers, :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true
+end

app/models/survey.rb

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+class Survey < ActiveRecord::Base
+  has_many :questions, :dependent => :destroy
+  accepts_nested_attributes_for :questions, :reject_if => lambda { |a| a[:content].blank? }, :allow_destroy => true
+end

app/views/layouts/application.html.erb

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+<!DOCTYPE html>
+<html>
+  <head>
+    <title><%= content_for?(:title) ? yield(:title) : "Untitled" %></title>
+    <%= stylesheet_link_tag "application" %>
+    <%= javascript_include_tag :defaults %>
+    <%= csrf_meta_tag %>
+    <%= yield(:head) %>
+  </head>
+  <body>
+    <div id="container">
+      <% flash.each do |name, msg| %>
+        <%= content_tag :div, msg, :id => "flash_#{name}" %>
+      <% end %>
+      <%= content_tag :h1, yield(:title) if show_title? %>
+      <%= yield %>
+    </div>
+  </body>
+</html>

app/views/surveys/_answer_fields.html.erb

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+<div class="fields">
+  <p>
+    <%= f.label :content, "Answer" %>
+    <%= f.text_field :content %>
+    <%# f.check_box :_destroy %>
+    <%# f.label :_destroy, "Remove" %>
+    <%= link_to_remove_fields "remove", f %>
+  </p>
+</div>

app/views/surveys/_form.html.erb

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+<%= form_for @survey do |f| %>
+  <%= f.error_messages %>
+  <p>
+    <%= f.label :name %><br />
+    <%= f.text_field :name %>
+  </p>
+  <%= f.fields_for :questions do |builder| %>
+    <%= render "question_fields", :f => builder %>
+  <% end %>
+  <p><%= link_to_add_fields "Add Question", f, :questions %></p>
+  <p><%= f.submit "Submit" %></p>
+<% end %>

app/views/surveys/_question_fields.html.erb

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+<div class="fields">
+  <p>
+    <%= f.label :content, "Question" %><br />
+    <%= f.text_area :content, :rows => 3 %><br />
+    <%# f.check_box :_destroy %>
+    <%# f.label :_destroy, "Remove Question" %>
+    <%= link_to_remove_fields "remove", f %>
+  </p>
+  <%= f.fields_for :answers do |builder| %>
+    <%= render 'answer_fields', :f => builder %>
+  <% end %>
+  <p><%= link_to_add_fields "Add Answer", f, :answers %></p>
+</div>

app/views/surveys/edit.html.erb

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+<% title "Edit Survey" %>
+
+<%= render 'form' %>
+
+<p>
+  <%= link_to "Show", @survey %> |
+  <%= link_to "View All", surveys_path %>
+</p>

app/views/surveys/index.html.erb

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+<% title "Surveys" %>
+
+<table>
+  <tr>
+    <th>Name</th>
+  </tr>
+  <% for survey in @surveys %>
+    <tr>
+      <td><%= survey.name %></td>
+      <td><%= link_to "Show", survey %></td>
+      <td><%= link_to "Edit", edit_survey_path(survey) %></td>
+      <td><%= link_to "Destroy", survey, :confirm => 'Are you sure?', :method => :delete %></td>
+    </tr>
+  <% end %>
+</table>
+
+<p><%= link_to "New Survey", new_survey_path %></p>

app/views/surveys/new.html.erb

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+<% title "New Survey" %>
+
+<%= render 'form' %>
+
+<p><%= link_to "Back to List", surveys_path %></p>

app/views/surveys/show.html.erb

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+<% title "Survey" %>
+
+<p>
+  <strong>Name:</strong>
+  <%= @survey.name %>
+</p>
+
+<ol>
+<% for question in @survey.questions %>
+  <li>
+    <%= question.content %>
+    <ul>
+    <% for answer in question.answers %>
+      <li><%= answer.content %></li>
+    <% end %>
+    </ul>
+  </li>
+<% end %>
+</ol>
+
+<p>
+  <%= link_to "Edit", edit_survey_path(@survey) %> |
+  <%= link_to "Destroy", @survey, :confirm => 'Are you sure?', :method => :delete %> |
+  <%= link_to "View All", surveys_path %>
+</p>

config.ru

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+# This file is used by Rack-based servers to start the application.
+
+require ::File.expand_path('../config/environment',  __FILE__)
+run Surveyor::Application