Added report csv epxort to job model

app/models/job.rb

@@ -110,6 +110,18 @@ class Job < ApplicationRecord
     save
   end
 
+  def self.report_to_csv(jobs)
+    columns = [ "id", "costumer_firstname", "costumer_lastname", "paid_at", "cost" ]
+    columns_readable = [ "ID", "Name", "Nachname", "bezahlt am", "Betrag" ]
+    CSV.generate(col_sep: ";") do |csv|
+      csv << columns_readable
+      jobs.each do |job|
+        # csv << job.attributes.values_at(*columns)
+        csv << [ job.id, job.costumer_firstname, job.costumer_lastname, job.paid_at.localtime.strftime("%Y-%m-%d"), job.cost.to_s + " €"  ]
+      end
+    end
+  end
+
   private
 
   def printed_pages_changes?
@@ -131,7 +143,7 @@ class Job < ApplicationRecord
   def calc_cost
     self.cost = (number_of_plans_a0 * cost_qm) + (number_of_plans_a1 * cost_qm / 2) +
                 (number_of_plans_a2 * cost_qm / 4) + (number_of_plans_a3 * cost_qm / 8) +
-                (costum_qm_plan * cost_qm)
+                (costum_qm_plan * cost_qm).round(2)
   end
 
   def set_cost_qm