Add "running" jobs state (#253)

This shows if any jobs are stuck and hanging out

engine/app/controllers/good_job/dashboards_controller.rb

@@ -22,6 +22,8 @@ def jobs
             sql = sql.finished
           when 'unfinished'
             sql = sql.unfinished
+          when 'running'
+            sql = sql.running
           when 'errors'
             sql = sql.where.not(error: nil)
           end
@@ -33,6 +35,7 @@ def states
         {
           'finished' => GoodJob::Job.finished.count,
           'unfinished' => GoodJob::Job.unfinished.count,
+          'running' => GoodJob::Job.running.count,
           'errors' => GoodJob::Job.where.not(error: nil).count,
         }
       end

lib/good_job/job.rb

@@ -102,6 +102,12 @@ def self.queue_parser(string)
     # @return [ActiveRecord::Relation]
     scope :finished, ->(timestamp = nil) { timestamp ? where(arel_table['finished_at'].lteq(timestamp)) : where.not(finished_at: nil) }
 
+    # Get Jobs that started but not finished yet.
+    # @!method running
+    # @!scope class
+    # @return [ActiveRecord::Relation]
+    scope :running, -> { where.not(performed_at: nil).where(finished_at: nil) }
+
     # Get Jobs on queues that match the given queue string.
     # @!method queue_string(string)
     # @!scope class