ruby - Rails parsing through data on the backend -

i have photo , product models.

in create action of product controller want find unassociated photos , connect them current product. trying find photos belong current user product id nil.

then each photo set product id @product.id

what should do?

  def create   @product = current_user.products.create(params[:product])     if @product.save       render "show", notice: "product created!"        # code here       else       render "new", error: "error submitting product"     end   end     def current_user     @current_user ||= user.find_by_auth_token(cookies[:auth_token])    end 

schema.rb

  create_table "photos", :force => true |t|     t.integer  "product_id"     t.integer  "user_id"   end    create_table "products", :force => true |t|     t.string   "name"     t.integer  "user_id"   end 

first should use build instead of create build instance of product, otherwise following line if @product.save meaningless. code should this:

def create   @product = current_user.products.build(params[:product]) # using build construct instance   if @product.save     render "show", notice: "product created!"      # update un-related photos     photo.where(:product_id => nil).update_all(:product_id => @product.id)     else    render "new", error: "error submitting product"   end end