View difference between Paste ID: nAaj0pNe and b0TfneSk

-yyc@ubuntu:~/Desktop/blog$ rails g model post title:string content:text
+blog$ rails g model post title:string content:text
       invoke  active_record
       create    db/migrate/20120505085607_create_posts.rb
       create    app/models/post.rb
       invoke    test_unit
       create      test/unit/post_test.rb
       create      test/fixtures/posts.yml
 
-yyc@ubuntu:~/Desktop/blog$ rake db:migrate
+blog$ rake db:migrate
 ==  CreatePosts: migrating ====================================================
 -- create_table(:posts)
    -> 0.0009s
 ==  CreatePosts: migrated (0.0011s) ===========================================
 
-yyc@ubuntu:~/Desktop/blog$ rails c
+blog$ rails c
 Loading development environment (Rails 3.2.3)
 irb(main):001:0> post = Post.new(:title => "Fisrt Post", :content=>"Content for first post")
 => #<Post id: nil, title: "Fisrt Post", content: "Content for first post", created_at: nil, updated_at: nil>
 
 irb(main):002:0> post.save
    (0.1ms)  begin transaction
   SQL (47.9ms)  INSERT INTO "posts" ("content", "created_at", "title", "updated_at") VALUES (?, ?, ?, ?)  [["content", "Content for first post"], ["created_at", Sat, 05 May 2012 09:09:01 UTC +00:00], ["title", "Fisrt Post"], ["updated_at", Sat, 05 May 2012 09:09:01 UTC +00:00]]
    (8.1ms)  commit transaction
 => true
 
 irb(main):003:0> post
 => #<Post id: 1, title: "Fisrt Post", content: "Content for first post", created_at: "2012-05-05 09:09:01", updated_at: "2012-05-05 09:09:01">
 
 irb(main):004:0> Post.create(:title => "Second Post", :content => "Content for second post")
    (0.1ms)  begin transaction
   SQL (0.4ms)  INSERT INTO "posts" ("content", "created_at", "title", "updated_at") VALUES (?, ?, ?, ?)  [["content", "Content for second post"], ["created_at", Sat, 05 May 2012 09:11:09 UTC +00:00], ["title", "Second Post"], ["updated_at", Sat, 05 May 2012 09:11:09 UTC +00:00]]
    (7.7ms)  commit transaction
 => #<Post id: 2, title: "Second Post", content: "Content for second post", created_at: "2012-05-05 09:11:09", updated_at: "2012-05-05 09:11:09">
 
 irb(main):005:0> posts = Post.all
   Post Load (0.2ms)  SELECT "posts".* FROM "posts"
 => [#<Post id: 1, title: "Fisrt Post", content: "Content for first post", created_at: "2012-05-05 09:09:01", updated_at: "2012-05-05 09:09:01">, #<Post id: 2, title: "Second Post", content: "Content for second post", created_at: "2012-05-05 09:11:09", updated_at: "2012-05-05 09:11:09">]
 
 irb(main):006:0> post = Post.find(2)
   Post Load (0.3ms)  SELECT "posts".* FROM "posts" WHERE "posts"."id" = ? LIMIT 1  [["id", 2]]
 => #<Post id: 2, title: "Second Post", content: "Content for second post", created_at: "2012-05-05 09:11:09", updated_at: "2012-05-05 09:11:09">
 
 irb(main):007:0> post.title
 => "Second Post"
 
 irb(main):008:0> post.content
 => "Content for second post"
 
 irb(main):009:0> post.title = "Our 2nd Post"
 => "Our 2nd Post"
 
 irb(main):010:0> post.save
    (0.1ms)  begin transaction
    (0.2ms)  UPDATE "posts" SET "title" = 'Our 2nd Post', "updated_at" = '2012-05-05 09:12:58.570208' WHERE "posts"."id" = 2
    (8.7ms)  commit transaction
 => true
 
 irb(main):011:0> post.update_attribute(:content, "Content for our 2nd post")
    (0.1ms)  begin transaction
    (0.2ms)  UPDATE "posts" SET "content" = 'Content for our 2nd post', "updated_at" = '2012-05-05 09:14:20.311204' WHERE "posts"."id" = 2
    (7.5ms)  commit transaction
 => true
 
 irb(main):013:0> post.update_attributes(:title => "Second Post", :content => "Content for second post")
    (0.1ms)  begin transaction
    (0.3ms)  UPDATE "posts" SET "title" = 'Second Post', "content" = 'Content for second post', "updated_at" = '2012-05-05 09:16:53.926752' WHERE "posts"."id" = 2
    (7.9ms)  commit transaction
 => true
 
 irb(main):014:0> post
 => #<Post id: 2, title: "Second Post", content: "Content for second post", created_at: "2012-05-05 09:11:09", updated_at: "2012-05-05 09:16:53">
 
 irb(main):015:0> post.destroy
    (0.1ms)  begin transaction
   SQL (0.5ms)  DELETE FROM "posts" WHERE "posts"."id" = ?  [["id", 2]]
    (7.8ms)  commit transaction
 => #<Post id: 2, title: "Second Post", content: "Content for second post", created_at: "2012-05-05 09:11:09", updated_at: "2012-05-05 09:16:53">
 
 irb(main):016:0> Post.find(2)
   Post Load (0.1ms)  SELECT "posts".* FROM "posts" WHERE "posts"."id" = ? LIMIT 1  [["id", 2]]
 ActiveRecord::RecordNotFound: Couldn't find Post with id=2
 	from /usr/lib/ruby/gems/1.9.1/gems/activerecord-3.2.3/lib/active_record/relation/finder_methods.rb:340:in `find_one'
 	from /usr/lib/ruby/gems/1.9.1/gems/activerecord-3.2.3/lib/active_record/relation/finder_methods.rb:311:in `find_with_ids'
 	from /usr/lib/ruby/gems/1.9.1/gems/activerecord-3.2.3/lib/active_record/relation/finder_methods.rb:107:in `find'
 	from /usr/lib/ruby/gems/1.9.1/gems/activerecord-3.2.3/lib/active_record/querying.rb:5:in `find'
 	from (irb):16
 	from /usr/lib/ruby/gems/1.9.1/gems/railties-3.2.3/lib/rails/commands/console.rb:47:in `start'
 	from /usr/lib/ruby/gems/1.9.1/gems/railties-3.2.3/lib/rails/commands/console.rb:8:in `start'
 	from /usr/lib/ruby/gems/1.9.1/gems/railties-3.2.3/lib/rails/commands.rb:41:in `<top (required)>'
 	from script/rails:6:in `require'
 	from script/rails:6:in `<main>'