rails has_many minimum collection size update validation

Question

I have a has_many association that accepts nested attributes. I need for there to be a minimum of 1 associated object in the collection, so I wrote a custom va

Answer 1

SooDesuNe

Yes, validates :foos, :length => {:minimum => 1, :message=>"At least one foo" } is better than the original one, but the same issue still happens.

To fix it, we could use validate method:

validate :validate_foos

private
def validate_foos
  remaining_foos = foos.reject(&:marked_for_destruction?)
  errors.add :foos, "At least one foo" if remaining_foos.empty?

Hope it helps to who encountered the same problem.