class Project< ApplicationRecord belongs_to_many :employees end

class Note < ApplicationRecord delegated_type :authorable, types: %w[ Customer Employee ] end

belongs_to :city

Country State (belongs to country) City (belongs to State) Neighborhood (belongs to city)

Address (Belongs to Neighborhood and City, because neighborhood is not required)

index_errors: true

I have a Post object that has_one :schedule with accepts_nested_attributes_for :schedule as well. The latter method sets autosave: true, which unfortunately has the effect of hoisting up errors into the parent object so that the errors object on Post looks like this: (byebug) post.errors.details {:"schedule.publish_at"=>[{:error=>:blank}]}