if a user is logged in, redirect them to the proper authenticated view, not the public route

app/controllers/posts_controller.rb

@@ -10,7 +10,13 @@ class PostsController < ApplicationController
   def show
     @post = Post.where(:id => params[:id], :public => true).includes(:author, :comments => :author).first
 
+    #hax to upgrade logged in users who can comment
     if @post
+      if user_signed_in? && current_user.find_visible_post_by_id(@post.id)
+        redirect_to "/#{@post.class.to_s.pluralize.underscore}/#{@post.id}"
+        return
+      end 
+
       @landing_page = true
       @person = @post.author
       if @person.owner_id

spec/controllers/posts_controller_spec.rb

@@ -6,21 +6,28 @@ require 'spec_helper'
 
 describe PostsController do
   before do
-    @user = alice
+    alice
   end
 
   describe '#show' do
     it 'shows a public post' do
-      status = @user.post(:status_message, :text => "hello", :public => true, :to => 'all')
+      status = alice.post(:status_message, :text => "hello", :public => true, :to => 'all')
 
       get :show, :id => status.id
       response.status= 200
     end
 
     it 'does not show a private post' do
-      status = @user.post(:status_message, :text => "hello", :public => false, :to => 'all')
+      status = alice.post(:status_message, :text => "hello", :public => false, :to => 'all')
       get :show, :id => status.id
       response.status = 302
     end
+
+    it 'redirects to the proper show page if the user has visibility of the post' do
+      status = alice.post(:status_message, :text => "hello", :public => true, :to => 'all')
+      sign_in bob
+      get :show, :id => status.id
+      response.should be_redirect
+    end
   end
 end