[6] pry(#<Post>):1> nesting
Nesting status:
--
0. main (Pry top level)
1. #<Post>
[7] pry(#<Post>):1> self.to_s
=> "#<Post:0x00000001cb1fa0>"
[8] pry(#<Post>):1> self.title = "title"
=> "title"
[9] pry(#<Post>):1> self.boy = "body"
NoMethodError: undefined method `boy=' for #<Post:0x00000001cb1fa0>
Did you mean?  body=
from /usr/local/rvm/gems/ruby-2.3.0/gems/activemodel-4.2.5/lib/active_model/attribute_methods.rb:433:in `method_missing'
[10] pry(#<Post>):1> self.body = "body"
=> "body"
[11] pry(#<Post>):1> self.changes
=> {"title"=>["First", "title"],
 "body"=>["post", "body"]}
[12] pry(#<Post>):1> self.save!
   (0.1ms)  begin transaction
  SQL (0.6ms)  UPDATE "posts" SET "title" = ?, "body" = ?, "updated_at" = ? WHERE "posts"."id" = ?  [["title", "title"], ["body", "body"], ["updated_at", "2017-04-28 23:45:31.370880"], ["id", 1]]
   (13.1ms)  commit transaction
=> true
[13] pry(#<Post>):1>