Add undo button for quickpay/dagschotel

app/controllers/orders_controller.rb

@@ -28,6 +28,17 @@ class OrdersController < ApplicationController
     end
   end
 
+  def destroy
+    order = Order.find(params[:id])
+    if order.created_at > 5.minutes.ago
+      order.destroy
+      flash[:success] = "Order has been removed."
+    else
+      flash[:error] = "This order has been placed too long ago, it can't be removed. Please contact a sysadmin."
+    end
+    redirect_to koelkast_root_path
+  end
+
   def overview
     @users_by_name = User.members.order(:name)
     @users_by_order = User.members.order(:orders_count).reverse_order
@@ -38,7 +49,7 @@ class OrdersController < ApplicationController
     order = user.orders.build
     order.products << user.dagschotel
     if order.save
-      flash[:success] = "Quick pay succeeded"
+      flash[:success] = "Quick pay succeeded. #{view_context.link_to("Undo", [user, order], method: :delete)}."
     else
       flash[:error] = order.errors.full_messages.first
     end

app/models/order.rb

@@ -14,9 +14,10 @@ class Order < ActiveRecord::Base
 
   after_initialize { self.total_price = 0 }
   after_create { self.user.pay(price) }
+  before_destroy { self.user.pay(-price) }
 
   belongs_to :user, counter_cache: true
-  has_many :order_products
+  has_many :order_products, dependent: :destroy
   has_many :products, through: :order_products
 
   attr_accessor :total_price

app/models/order_product.rb

@@ -10,6 +10,7 @@
 
 class OrderProduct < ActiveRecord::Base
   after_create :remove_from_stock
+  before_destroy :put_back_in_stock
 
   belongs_to :order
   belongs_to :product
@@ -30,4 +31,9 @@ class OrderProduct < ActiveRecord::Base
       product.stock -= self.count
       product.save
     end
+
+    def put_back_in_stock
+      product.stock += self.count
+      product.save
+    end
 end

app/views/application/_flash.html.erb

@@ -8,7 +8,7 @@
   <% if flash[:success] %>
     <div class="alert alert-success alert-dismissable">
       <button type="button" class="close" data-dismiss="alert" aria-hidden="true">&times;</button>
-      <strong>Success!</strong> <%= flash[:success] %>
+      <strong>Success!</strong> <%= raw flash[:success] %>
     </div>
   <% end %>
   <% if flash[:notice] %>

config/routes.rb

@@ -12,7 +12,7 @@ Rails.application.routes.draw do
   end
 
   resources :users do
-    resources :orders, only: [:new, :create, :index]
+    resources :orders
     get 'quickpay' => 'orders#quickpay'
     get 'dagschotel/:product_id' => 'users#dagschotel', as: "dagschotel"
   end