Added Quantity ordering

Some table columns made unwrappable

app/controllers/quantities_controller.rb

@@ -1,6 +1,6 @@
 class QuantitiesController < ApplicationController
   before_action :find_project_by_project_id, only: [:index, :create]
-  before_action :find_quantity, only: [:destroy, :toggle]
+  before_action :find_quantity, only: [:destroy, :toggle, :up, :down, :left, :right]
   before_action :authorize
 
   def index
@@ -31,6 +31,26 @@ class QuantitiesController < ApplicationController
     redirect_to project_quantities_url(@project)
   end
 
+  def up
+    @quantity.move_left if @quantity.left_sibling.present?
+    redirect_to project_quantities_url(@project)
+  end
+
+  def down
+    @quantity.move_right if @quantity.right_sibling.present?
+    redirect_to project_quantities_url(@project)
+  end
+
+  def left
+    @quantity.move_to_right_of(@quantity.parent) if @quantity.parent.present?
+    redirect_to project_quantities_url(@project)
+  end
+
+  def right
+    @quantity.move_to_child_of(@quantity.left_sibling) if @quantity.left_sibling.present?
+    redirect_to project_quantities_url(@project)
+  end
+
   private
 
   def quantity_params