Add update task.

dur: 20min.

lib/tasks/csv_import.rake

@@ -1,5 +1,4 @@
 namespace :csv do
-
   desc 'Import csv'
   task :import => :environment do
     File.open("doc/datenbank-digital-hans_new.csv", "r").lines do |line|
@@ -12,4 +11,27 @@ namespace :csv do
     end
   end
 
+  desc "Update csv"
+  task :update => :environment do
+    updated_devices = []
+
+    # update/create
+    File.open("doc/datenbank_update_19_06_2012_inventar.csv", "r").lines do |line|
+      barcode, serial, model, company, kind = line.split(",")[0,5].map(&:strip)
+      next if kind == "Art" || kind == ""
+      barcode = "%06d" % barcode.to_i
+      device = Device.where(barcode: barcode).first
+      if device
+        device.update_attributes(model: model, company: company, kind: kind)
+      else
+        device = Device.create(
+          barcode: barcode, model: model, company: company, kind: kind
+        )
+      end
+      updated_devices << device
+    end
+
+    # delete
+    (Device.all.entries - updated_devices).map(&:destroy)
+  end
 end