具有多态关联的accepts_nested_attributes_for

Question

Is there any way to halt saving of child before parent.

I am using accepts_nested_attributes_for with polymorphic association.

I used multiple options validates_presence_of :parent_id , validates_assoicated :parent but none are working.

For example, I do have a class

Class Person
  include HasPhoneNumbers
  ..
end


module HasPhoneNumbers
 def self.included(kclass)
   kclass.has_many :phone_numbers, :as => :callable, :dependent => kclass == Person ? :destroy : :nullify
 end
 klass.accepts_nested_attributes_for :phone_numbers, :reject_if => lambda {|pn| pn.keys.any?{|k| k.to_sym != :id && pn[k].blank?} }
end


class PhoneNumber
  belongs_to :callable, :polymorphic => true
end

So while saving person due to validation in person object, it was not saving. However, child(phone_number) was saving. So I need to restrict it to not save child(phone_number) before parent(person) saves.

I did try multiple options using validates_presence_of and validates_associated , but none are working for me.

Answer 1

@person = Person.new(params[:person])
ActiveRecord::Base.transaction do
  person.save!
end

Wrapping your saves within a transaction should roll back the phone number save if the person fails validation.

Reference: ActiveRecord Transactions