gistfile1.txt

(hy@sb) irb
irb(main):001:0> require 'blog.rb'
 == Performing Up Migration #1: auto_migrate
   ALTER TABLE "posts" ADD COLUMN "categories" VARCHAR DEFAULT NULL
   -> 0.0030s
   ALTER TABLE "posts" ADD COLUMN "tags" VARCHAR DEFAULT NULL
   -> 0.0015s
 -> 0.0056s
=> true
irb(main):002:0> Post.all
=> []
irb(main):003:0> Post.new
=> #<Post id=nil name=nil content=nil slug=nil>
irb(main):004:0>