[5] pry(#<Post>):1> nesting
Nesting status:
--
0. main (Pry top level)
1. #<Post>
[6] pry(#<Post>):1> self.to_s
=> "#<Post:0x00000004addd48>"
[7] pry(#<Post>):1> self.title = 'some new title'
=> "some new title"
[8] pry(#<Post>):1> self.body = "some new body"
=> "some new body"
[9] pry(#<Post>):1> self.changes
=> {"title"=>["First Post", "some new title"],
 "body"=>["This is the first post in our system", "some new body"]}
[10] pry(#<Post>):1> self.save!
   (0.1ms)  begin transaction
  SQL (0.4ms)  UPDATE "posts" SET "title" = ?, "body" = ?, "updated_at" = ? WHERE "posts"."id" = ?  [["title", "some new title"], ["body", "some new body"], ["updated_at", "2017-08-18 00:12:14.968479"], ["id", 1]]
   (8.4ms)  commit transaction
=> true