rails 控制台和 put 中的不同结果

Question

When I use puts(@participantt = Participant.where(id: 1)) then in the console I get

  Participant Load (0.3ms)  SELECT "participants".* FROM "participants" WHERE "participants"."id" = $1  [["id", 1]]
  ↳ app/controllers/interviews_controller.rb:119:in `puts'
#<Participant:0x000000000c778bf0>

But if I type @participantt = Participant.where(id: 1) in rails console then I get

  Participant Load (0.7ms)  SELECT "participants".* FROM "participants" WHERE "participants"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 11]]
=> #<ActiveRecord::Relation [#<Participant id: 1, name: "Ram", email: "Ram@g.com", created_at: "2020-05-08 08:19:00", updated_at: "2020-05-08 08:19:00">]>

Why is this so?

Answer 1

puts calls to_s on before printing result of expression(which will be an object) passed to it. It generally prints class name with it's object id.

Here, result of @participant = Participant.where(id: 1) is the Participant with id and get stored in instance variable @participant

Passing @participant to puts will first call @participant.to_s before printing it.

In case of just @participant = Participant.where(id: 1) , the console shows the result which is typical REPL utility does. And if you do puts @participant there after then you will again get same as what you get with puts in you question.