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Q: Virtual Attribute in Rails 4 I have a model of product and I need to write in the _form view , the number of the product that an admin wants to insert. I have another table with the Supply (number of product) so in my product table I don't have the attribute quantity , but I have just the supply_id (that links my two tables of product and supply) Since I don't have the quantity in my product table, I used a virtual attribute on Product. I had to change the view of the new and edit product cause in the new I want the field quantity but in the edit I don't want (cause I use another view to do this) So, I deleted the partial _form and created separate view. Also, I had to set in the controller of products that if I want to update a product, i have to call a set_quantity callback, cause I have to insert a "fake" value to fill the params[:product][:quantity]. This , because I setted the validation presence true ,on the quantity virtual field in the product model. I want to know , if all this story is right (it works , but I want a suggestion about the programming design of this story. Cause I don't like the fact that I give a fake value to fill the quantity field when I have to update a product) Controller: class ProductsController < ApplicationController include SavePicture before_action :set_product, only: [:show, :edit, :update, :destroy] before_action :set_quantita, only: [:update] .... def set_quantita params[:product][:quantita]=2 #fake value for the update action end .... end Model: class Product < ActiveRecord::Base belongs_to :supply ,dependent: :destroy attr_accessor :quantita validates :quantita, presence:true end Can you say me if there is a better way to fill the param[:product][:quantity] in the case of the update action? Cause i don't like the fact that i give it the value of 2. Thank you. A: Instead of using attr_accessor you could create custom getter/setters on your product model. Note that these are not backed by an regular instance attribute. Also you can add a validation on the supply association instead of your virtual attribute. class Product < ActiveRecord::Base belongs_to :supply ,dependent: :destroy validates_associated :supply, presence:true # getter method def quantita supply end def quantita=(val) if supply supply.update_attributes(value: val) else supply = Supply.create(value: val) end end end In Ruby assignment is actually done by message passing: product.quantita = 1 Will call product#quantita=, with 1 as the argument. Another alternative is to use nested attributes for the supply. class Product < ActiveRecord::Base belongs_to :supply ,dependent: :destroy validates_associated :supply, presence:true accepts_nested_attributes_for :supply end This means that Product accepts supply_attributes - a hash of attributes. class ProductsController < ApplicationController #... before_action :set_product, only: [:show, :edit, :update, :destroy] def create # will create both a Product and Supply @product = Product.create(product_params) end def update # will update both Product and Supply @product.update(product_params) end private def product_params # Remember to whitelist the nested parameters! params.require(:product) .allow(:foo, supply_attributes: [:foo, :bar])