posts_controller.rb

class PostsController < ApplicationController

  def index
    @posts = Post.all
  end

  def show
    @post = Post.find(params[:id])
  end

  def new
    @post = Post.new
  end

  def create
    @post = Post.new(params[:post])

    if @post.save
      redirect_to :action => :show, :id => @post.id
    else
      render 'new'
    end
  end
end