Merge 21d8f25 into 711f08d

lib/delayed/backend/active_record.rb

@@ -63,11 +63,11 @@ def self.reserve(worker, max_run_time = Worker.max_run_time)
             subquery_sql      = ready_scope.limit(1).lock(true).select('id').to_sql
             reserved          = self.find_by_sql(["UPDATE #{quoted_table_name} SET locked_at = ?, locked_by = ? WHERE id IN (#{subquery_sql}) RETURNING *", now, worker.name])
             reserved[0]
-          when "MySQL", "Mysql2"
-            # This works on MySQL and possibly some other DBs that support UPDATE...LIMIT. It uses separate queries to lock and return the job
-            count = ready_scope.limit(1).update_all(:locked_at => now, :locked_by => worker.name)
-            return nil if count == 0
-            self.where(:locked_at => now, :locked_by => worker.name, :failed_at => nil).first
+          # when "MySQL", "Mysql2"
+          #   # This works on MySQL and possibly some other DBs that support UPDATE...LIMIT. It uses separate queries to lock and return the job
+          #   count = ready_scope.limit(1).update_all(:locked_at => now, :locked_by => worker.name)
+          #   return nil if count == 0
+          #   self.where(:locked_at => now, :locked_by => worker.name, :failed_at => nil).first
           when "MSSQL", "Teradata"
             # The MSSQL driver doesn't generate a limit clause when update_all is called directly
             subsubquery_sql = ready_scope.limit(1).to_sql