What is the difference between using .exists?, and .present? in Ruby?

Question

I want to make sure I\'m using them for the correct occasion and want to know of any subtleties. They seem to function the same way, which is to check to see if a object fi

Answer 1

You can avoid database query by using present?:

all_endorsements_11 = ArtworkEndorsement.where(user_id: 11)
ArtworkEndorsement Load (0.3ms)  SELECT "artwork_endorsements".* FROM "artwork_endorsements" WHERE "artwork_endorsements"."user_id" = $1  [["user_id", 11]]
all_endorsements_11.present?
=> true 
all_endorsements_11.exists?
ArtworkEndorsement Exists (0.4ms)  SELECT  1 AS one FROM "artwork_endorsements" WHERE "artwork_endorsements"."user_id" = $1 LIMIT 1  [["user_id", 11]]
=> true