Added 2.3.X ActiveRecord compatible backend (without Arel-style scope)

lib/hirefire.rb

@@ -44,8 +44,9 @@ module Backend
     ##
     # HireFire::Backend::DelayedJob namespace
     module DelayedJob
-      autoload :ActiveRecord, File.join(DELAYED_JOB_PATH, 'active_record')
-      autoload :Mongoid,      File.join(DELAYED_JOB_PATH, 'mongoid')
+      autoload :ActiveRecord,     File.join(DELAYED_JOB_PATH, 'active_record')
+      autoload :OldActiveRecord,  File.join(DELAYED_JOB_PATH, 'old_active_record')
+      autoload :Mongoid,          File.join(DELAYED_JOB_PATH, 'mongoid')
     end
 
     ##

lib/hirefire/backend.rb

@@ -18,7 +18,11 @@ def self.included(base)
       # Delayed Job specific backends
       if defined?(::Delayed)
         if defined?(::Delayed::Backend::ActiveRecord::Job)
-          base.send(:include, HireFire::Backend::DelayedJob::ActiveRecord)
+          if ActiveRecord::VERSION::STRING >= '3.0.0'
+            base.send(:include, HireFire::Backend::DelayedJob::ActiveRecord)
+          else
+            base.send(:include, HireFire::Backend::DelayedJob::OldActiveRecord)
+          end
         end
 
         if defined?(::Delayed::Backend::Mongoid::Job)

lib/hirefire/backend/delayed_job/old_active_record.rb

@@ -0,0 +1,33 @@
+# encoding: utf-8
+
+module HireFire
+  module Backend
+    module DelayedJob
+      module OldActiveRecord
+
+        ##
+        # Counts the amount of queued jobs in the database,
+        # failed jobs are excluded from the sum
+        #
+        # @return [Fixnum] the amount of pending jobs
+        def jobs
+          ::Delayed::Job.all(
+            :conditions => ['failed_at IS NULL and run_at <= ?', Time.now.utc]
+          ).count
+        end
+
+        ##
+        # Counts the amount of jobs that are locked by a worker
+        #
+        # @return [Fixnum] the amount of (assumably working) workers
+        def workers
+          ::Delayed::Job.all(
+            :conditions => 'locked_by IS NOT NULL'
+          ).count
+        end
+
+      end
+    end
+  end
+end
+