Add delayed job for create bulk invoice

app/assets/javascripts/admin/orders/controllers/orders_controller.js.coffee

@@ -73,9 +73,7 @@ angular.module("admin.orders").controller "ordersCtrl", ($scope, RequestMonitor,
     $scope.fetchResults(newPage)
 
   $scope.bulkInvoice = ->
-    params = ''
-    angular.forEach $scope.selected_orders, (order_id) ->
-      params += 'order_ids[]='+order_id+'&'
-
-    $window.open('/admin/orders/invoices/show?'+params)
-    true
+    $http.post("/admin/orders/invoices", {order_ids: $scope.selected_orders}).success (data) ->
+      console.log(data)
+    .error (data) ->
+      console.log(data)

app/controllers/spree/admin/invoices_controller.rb

@@ -1,28 +1,16 @@
-require 'combine_pdf'
-
 module Spree
   module Admin
     class InvoicesController < Spree::Admin::BaseController
-      def show
-        combined_pdf = CombinePDF.new
+      def create
+        Delayed::Job.enqueue BulkInvoiceJob.new(params[:order_ids], filename)
 
-        Spree::Order.where(id: params[:order_ids]).each do |order|
-          @order = order
-          pdf_data = render_to_string pdf: "invoice-#{order.number}.pdf",
-                                      template: invoice_template,
-                                      formats: [:html], encoding: "UTF-8"
-
-          combined_pdf << CombinePDF.parse(pdf_data)
-        end
-
-        send_data combined_pdf.to_pdf, filename: "invoices.pdf",
-                                       type: "application/pdf", disposition: :inline
+        render text: filename, status: :ok
       end
 
       private
 
-      def invoice_template
-        Spree::Config.invoice_style2? ? "spree/admin/orders/invoice2" : "spree/admin/orders/invoice"
+      def filename
+        @filename ||= Time.zone.now.to_i.to_s
       end
     end
   end

app/jobs/bulk_invoice_job.rb

@@ -0,0 +1,44 @@
+BulkInvoiceJob = Struct.new(:order_ids, :filename) do
+  include WickedPdf::PdfHelper
+
+  def perform
+    generate_pdf
+  rescue StandardError => e
+    log e
+  end
+
+  private
+
+  def generate_pdf
+    pdf = CombinePDF.new
+    orders = Spree::Order.where(id: order_ids)
+    renderer = ApplicationController.new
+
+    orders.each do |order|
+      invoice = renderer.render_to_string pdf: "invoice-#{order.number}.pdf",
+                                          template: invoice_template,
+                                          formats: [:html], encoding: "UTF-8",
+                                          locals: { :@order => order }
+
+      pdf << CombinePDF.parse(invoice)
+    end
+
+    pdf.save "#{directory}/#{filename}.pdf"
+  end
+
+  def invoice_template
+    Spree::Config.invoice_style2? ? "spree/admin/orders/invoice2" : "spree/admin/orders/invoice"
+  end
+
+  def log(error)
+    logger = Logger.new('bulkinvoice.log')
+    logger.debug e.message
+    logger.debug e.backtrace[0]
+  end
+
+  def directory
+    dir = 'tmp/invoices'
+    Dir.mkdir(dir) unless File.exist?(dir)
+    dir
+  end
+end

config/routes/spree.rb

@@ -76,7 +76,7 @@ Spree::Core::Engine.routes.prepend do
       get :managed, on: :collection
 
       collection do
-        resources :invoices, only: [:show]
+        resources :invoices, only: [:create]
       end
     end
   end