[5] pry(#<Post>):1> nesting
Nesting status:
--
0. main (Pry top level)
1. #<Post>
[6] pry(#<Post>):1> self_to.s
NameError: undefined local variable or method `self_to' for #<Post:0x00007ff13cf2f0c8>
from /usr/local/lib/ruby/gems/2.4.0/gems/activemodel-5.1.4/lib/active_model/attribute_methods.rb:432:in `method_missing'
[7] pry(#<Post>):1> self.to_s
=> "#<Post:0x00007ff13cf2f0c8>"
[8] pry(#<Post>):1> self.title = 'some new title'
=> "some new title"
[9] pry(#<Post>):1> self.body = 'some new body'
=> "some new body"
[10] pry(#<Post>):1> self.changes
=> {"title"=>["First Post", "some new title"], "body"=>["This is the first post in our system", "some new body"]}
[11] pry(#<Post>):1> self.save!
   (0.1ms)  begin transaction
  SQL (0.8ms)  UPDATE "posts" SET "title" = ?, "body" = ?, "updated_at" = ? WHERE "posts"."id" = ?  [["title", "some new title"], ["body", "some new body"], ["updated_at", "2017-12-04 23:55:09.076465"], ["id", 1]]
   (6.8ms)  commit transaction
=> true