Add Quantity #new, #create, #destroy actions

app/controllers/quantities_controller.rb

@@ -1,4 +1,9 @@
 class QuantitiesController < ApplicationController
+  before_action only: :new do
+    find_quantity if params[:id].present?
+  end
+  before_action :find_quantity, only: [:edit, :update, :rebase, :destroy]
+
   before_action except: :index do
     raise AccessForbidden unless current_user.at_least(:active)
   end
@@ -6,4 +11,34 @@ class QuantitiesController < ApplicationController
   def index
     @quantities = current_user.quantities.includes(:parent).includes(:subquantities).ordered
   end
+
+  def new
+    @quantity = current_user.quantities.new(parent: @quantity)
+  end
+
+  def create
+    @quantity = current_user.quantities.new(quantity_params)
+    if @quantity.save
+      @before, @quantity, @ancestors = @quantity.succ_and_ancestors
+      flash.now[:notice] = t('.success', quantity: @quantity)
+    else
+      render :new
+    end
+  end
+
+  def destroy
+    @quantity.destroy!
+    @ancestors = @quantity.ancestors
+    flash.now[:notice] = t('.success', quantity: @quantity)
+  end
+
+  private
+
+  def quantity_params
+    params.require(:quantity).permit(Quantity::ATTRIBUTES)
+  end
+
+  def find_quantity
+    @quantity = Quantity.find_by!(id: params[:id], user: current_user)
+  end
 end