[1] pry(main)> nesting
Nesting status:
--
0. main (Pry top level)
[2] pry(main)> post = Post.first
  Post Load (2.4ms)  SELECT  "posts".* FROM "posts" ORDER BY "posts"."id" ASC LIMIT ?  [["LIMIT", 1]]
=> #<Post:0x007fe25e42b178
 id: 1,
 title: "First Post",
 body: "This is the first post in our system",
 created_at: Mon, 12 Mar 2018 02:03:24 UTC +00:00,
 updated_at: Mon, 12 Mar 2018 02:03:24 UTC +00:00>
[3] pry(main)> cd post
[4] pry(#<Post>):1> nesting
Nesting status:
--
0. main (Pry top level)
1. #<Post>
[5] pry(#<Post>):1> self.to_s
=> "#<Post:0x007fe25e42b178>"
[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.save!
   (0.2ms)  begin transaction
  SQL (10.5ms)  UPDATE "posts" SET "title" = ?, "body" = ?, "updated_at" = ? WHERE "posts"."id" = ?  [["title", "some new title"], ["body", "some new body"], ["updated_at", "2018-03-12 02:32:38.021196"], ["id", 1]]
   (13.4ms)  commit transaction
=> true