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I'm using the nested_form gem for my AddressBook relation. When the user blanks out the value of an existing Addr , I want to delete that Addr rather than saving with a blank value class Person < ActiveRecord::Base has_many :addrs, dependent: :destroy attr_accessible :name, :addrs_attributes accepts_nested_attributes_for :addrs, reject_if: :addr_blank, allow_destroy: true def addr_blank(a) valid? && a[:id].blank? && a[:value].blank? end class Addr < ActiveRecord::Base belongs_to :person attr_accessible :kind, :label, :value, :person_id My :reject_if method works well but it doesn't give me everything I need valid? keeps my blank Addrs around through validation a[:id].blank? avoids rejections when the user blanks out and existing record Now, I need to delete (rather than save) an existing Addr when the user blanks the value . Also, I'm exposing Persons and Addrs via a RESTful API. I see two possible options: Post process the params hash to add the magical _destroy=1 param. IOW, emulate the user activity of pressing the delete button. Encapsulate this inside the Addr model such that an update with a blank value is effectively considered a delete. Based on the advice here is how I implemented it: people_controller.rb def update @person = Person.find(params[:id]) @person.destroy_blank_addrs(params[:person]) respond_to do |format| ... person.rb def destroy_blank_addrs(person_params) if valid? && person_params[:addrs_attributes] person_params[:addrs_attributes].each do |addr_params_array| addr_params= addr_params_array[

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