myapp.rb

require 'web'

urls = { 
  '/', 'index',
  '/users', 'users',
  '/user/(\d+)', 'user',
  '/users/new', 'new_user',
  '/user/(\d+)/edit', 'edit_user'
}

class Index
  def get 
    Web.template "index"
  end
end

class Users
  def get
    @users = User.find(:all)
    Web.template "users/index", @users
  end

  def post
    @user = User.new(params[:user])
    if @user.save
      Web.redirect "/user/#{@user.id}"
    else
      Web.redirect "/users/new", :internal => true, :message => "FAIL"
    end
  end
end

class User < ActiveRecord::Base
  belongs_to :foo
  validates_presence_of :bar
  
  def get(id)
    @user = class.find(id)
    Web.template "user", @user
  end

  def put(id)
    @user = class.find(id)
    @user.update_attributes(params[:user])
    if @user.save
      Web.redirect "/user/#{@user.id}", :message => "UPDATED"
    else
      Web.redirect "/user/#{@user.id}/edit", :message => "FAIL", :internal => true
    end
  end

  def delete(id)
    super
    Web.redirect "/users"
  end
end

class NewUser
  def get
    @user = User.new
    Web.template "users/new", @user
  end
end

class EditUser
  def get(id)
    @user = User.find(id)
    Web.template "users/edit", @user
  end
end

Web.start(urls, :port => 8765)