Explicitly convert FixNums to Integers in time comparison.

lib/delayed/backend/data_mapper.rb

@@ -30,7 +30,7 @@ def self.find_available(worker_name, limit = 5, max_run_time = Worker.max_run_ti
           simple_conditions[:priority.gte] = Worker.min_priority if Worker.min_priority
           simple_conditions[:priority.lte] = Worker.max_priority if Worker.max_priority
           simple_conditions[:queue] = Worker.queues if Worker.queues.any?
-          lockable = (all(:run_at.lte => db_time_now) & (all(:locked_at => nil) | all(:locked_at.lt => db_time_now - max_run_time)) | all(:locked_by => worker_name)) & all(:failed_at => nil)
+          lockable = (all(:run_at.lte => db_time_now) & (all(:locked_at => nil) | all(:locked_at.lt => db_time_now - max_run_time.to_i)) | all(:locked_by => worker_name)) & all(:failed_at => nil)
           lockable.all(simple_conditions)
         end
 
@@ -48,7 +48,7 @@ def lock_exclusively!(max_run_time, worker = worker_name)
           # DM doesn't give us the number of rows affected by a collection update
           # so we have to circumvent some niceness in DM::Collection here
           collection = if locked_by != worker
-            (self.class.all(:id => id) & (self.class.all(:locked_at => nil) | self.class.all(:locked_at.lt => now - max_run_time)) & self.class.all(:run_at.lte => now))
+            (self.class.all(:id => id) & (self.class.all(:locked_at => nil) | self.class.all(:locked_at.lt => now - max_run_time.to_i)) & self.class.all(:run_at.lte => now))
           else
             self.class.all(:id => id, :locked_by => worker)
           end