Rails: How to limit number of items in has_many association (from Parent)

Question

I would like to limit the number of items in an association. I want to ensure the User doesn\'t have more than X Things. This question was asked before and the solution had th

Answer 1

You should try this.

class Thing  :create

  def thing_count
      user = User.find(id)
      errors.add(:base, "Exceeded thing limit") if user.things.count >= 5
  end
end