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def new
  if params[:user]
    @user = User.new(params[:user])
    render @user.valid? ? :confirm : :new
  else
    @user = User.new
    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @user }
    end

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<%= form_for(@user) do |f| %>
	<%= f.hidden_field :name %>
	<%= f.hidden_field :age %>
	<p>
		<b>Name:</b>
		<%= @user.name %>
	</p>

	<p>
		<b>Age:</b>

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<h1>New user</h1>

<%= form_for @user, url: new_user_path(user: @user), method: :get do |f| %>
  <% if @user.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@user.errors.count, "error") %> prohibited this user from being saved:</h2>

      <ul>
      <% @user.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>

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helloWorld = () -> alert "Hello World!"
# <%= link_to_function 'greeting', "helloWorld();" %>

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@helloWorld = () -> alert "Hello World!"

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(function() {
  var helloWorld2;
  // @helloWorld
  this.helloWorld = function() {
    return alert("Hello World!");
  };
  // helloWorld2
  helloWorld2 = function() {
    return alert("Hello World!");
  };

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a = [1, 2, 3, 4, 5, 6, 5, 4]
a.uniq.select{|i| a.index(i) != a.rindex(i)} #=> [4, 5]

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<!-- Book(id: integer, title: string, created_at: datetime, updated_at: datetime) -->
<!-- not multiple -->
<%= collection_select 'book', 'id', Book.all, 'id', 'title', { selected: "1" } %>
<!-- multiple -->
<%= collection_select 'book', 'id', Book.all, 'id', 'title', { selected: ["1", "2", "3"] }, { multiple: "multiple" } %>

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# generate model
$ rails g model team name
$ rails g model user name age:integer team:references
$ rake db:migrate
$ sed -n '14,32p' db/schema.rb
ActiveRecord::Schema.define(:version => 20120327062610) do

  create_table "teams", :force => true do |t|
    t.string   "name"
    t.datetime "created_at", :null => false

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$ heroku pg:reset --db SHARED_DATABASE_URL
 !    The --db option has been deprecated
 !    Usage: heroku pg:reset [DATABASE]
# 怒られたので
$ heroku pg:reset SHARED_DATABASE_URL
SHARED_DATABASE_URL is deprecated, please use SHARED_DATABASE
----> Resetting SHARED_DATABASE (DATABASE_URL)

 !    WARNING: Potentially Destructive Action
 !    This command will affect the app: [アプリ名]