Quantity parent options are updated through UJS

app/controllers/quantities_controller.rb

@@ -1,6 +1,6 @@
 class QuantitiesController < ApplicationController
   before_action :init_session_filters
-  before_action :find_project_by_project_id, only: [:index, :create, :filter]
+  before_action :find_project_by_project_id, only: [:index, :parents, :create, :filter]
   before_action :find_quantity, only: [:edit, :update, :destroy, :toggle, :move]
   before_action :authorize
 
@@ -10,6 +10,11 @@ class QuantitiesController < ApplicationController
     prepare_quantities
   end
 
+  def parents
+    @form = params[:form]
+    @domain = params[:quantity][:domain]
+  end
+
   def create
     @quantity = @project.quantities.new(quantity_params)
     if @quantity.save