[4] pry(#<Post>):1> nesting
Nesting status:
--
0. main (Pry top level)
1. #<Post>
[5] pry(#<Post>):1> self.to_s
=> "#<Post:0x007fdb6eee4e58>"
[6] pry(#<Post>):1> self.title = 'some new title'
=> "some new title"
[7] pry(#<Post>):1> self.body = 'some new body'
=> "some new body"
[8] pry(#<Post>):1> self.changes
=> {"title"=>["First Post", "some new title"],
 "body"=>
  ["This is the first post in our system", "some new body"]}