Added alert if number_of_pages could not be set

app/controllers/operator/jobs_controller.rb

@@ -83,10 +83,15 @@ class Operator::JobsController < ApplicationController
   end
 
   def decrement_page
-    @job.decrement_page(params[:din])
+    if @job.decrement_page(params[:din])
+      flash[:notice] = "Job was successfully updated"
+    else
+      flash[:alert] = "Job could not be updated"
+    end
+
 
     respond_to do |format|
-      format.html { redirect_to operator_jobs_url, notice: "Job was successfully updated." }
+      format.html { redirect_to operator_jobs_url }
     end
   end
 
@@ -106,4 +111,3 @@ class Operator::JobsController < ApplicationController
     params.require(:job).permit(:operator_id, :costumer_id, :operator_firstname, :operator_lastname, :costumer_firstname, :costumer_lastname)
   end
 end
-