message.rb

# Our Model

class Message < ActiveRecord::Base
  validates_presence_of :name, :subject, :body
  validates_format_of :email, :with => /^(\S+)@(\S+)\.(\S+)$/
end

messages_controller.rb

# Our Controller

class MessagesController < ApplicationController
  # GET /messages
  # GET /messages.xml
  def index
    @messages = Message.all

    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @messages }
    end
  end

  # GET /messages/1
  # GET /messages/1.xml
  def show
    @message = Message.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.xml  { render :xml => @message }
    end
  end

  # GET /messages/new
  # GET /messages/new.xml
  def new
    @message = Message.new

    respond_to do |format|
      format.html # new.html.erb
      format.xml  { render :xml => @message }
    end
  end

  # GET /messages/1/edit
  def edit
    @message = Message.find(params[:id])
  end

  # POST /messages
  # POST /messages.xml
  def create
    @message = Message.new(params[:message])

    respond_to do |format|
      if @message.save
        flash[:notice] = 'Message was successfully created.'
        format.html { redirect_to(@message) }
        format.xml  { render :xml => @message, :status => :created, :location => @message }
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @message.errors, :status => :unprocessable_entity }
      end
    end
  end

  # PUT /messages/1
  # PUT /messages/1.xml
  def update
    @message = Message.find(params[:id])

    respond_to do |format|
      if @message.update_attributes(params[:message])
        flash[:notice] = 'Message was successfully updated.'
        format.html { redirect_to(@message) }
        format.xml  { head :ok }
      else
        format.html { render :action => "edit" }
        format.xml  { render :xml => @message.errors, :status => :unprocessable_entity }
      end
    end
  end

  # DELETE /messages/1
  # DELETE /messages/1.xml
  def destroy
    @message = Message.find(params[:id])
    @message.destroy

    respond_to do |format|
      format.html { redirect_to(messages_url) }
      format.xml  { head :ok }
    end
  end
end

our_database_migration.rb

# this is the database migration file

class CreateMessages < ActiveRecord::Migration
  def self.up
    create_table :messages do |t|
      t.string :name
      t.string :company
      t.string :phone
      t.string :email
      t.string :subject
      t.text :body

      t.timestamps
    end
  end

  def self.down
    drop_table :messages
  end
end

routes.rb

ActionController::Routing::Routes.draw do |map|
  map.resources :messages

  map.connect ':controller/:action/:id'
  map.connect ':controller/:action/:id.:format'
end