Support rails versions that don't have after_all_transactions_commit

Author: jpcamara

app/models/solid_queue/batch.rb

@@ -33,9 +33,12 @@ def enqueue(&block)
         block.call(self)
       end
 
-      ActiveRecord.after_all_transactions_commit do
-        enqueue_empty_job if reload.total_jobs == 0
-        enqueue_monitor_job
+      if ActiveSupport.respond_to?(:after_all_transactions_commit)
+        ActiveRecord.after_all_transactions_commit do
+          start_monitoring
+        end
+      else
+        start_monitoring
       end
     end
 
@@ -141,6 +144,11 @@ def enqueue_monitor_job
         end
       end
 
+      def start_monitoring
+        enqueue_empty_job if reload.total_jobs == 0
+        enqueue_monitor_job
+      end
+
     class << self
       def enqueue(on_success: nil, on_failure: nil, on_finish: nil, metadata: nil, &block)
         new.tap do |batch|