Check if a uniqueness validation has been applied in a relation

[cesarjr]

Sometimes it's possible that, by mistake, a uniqueness validation is applied in the relation instead of its foreign key:

class User < ApplicationRecord
  belongs_to :seller
  
  # wrong:
  validates :seller, uniqueness: true

  # correct:
  # validates :seller_id, uniqueness: true
end

In this situation, it's possible that an N+1 query issue could happen in saving multiple User records at once. This problem could be avoided applying the validation in seller_id instead of seller.

If this ideia is interesting, I can ask for my team to implement it. But I don't want to waste time if it is not interesting for the project.