Heroku scheduler calls job but it doesn't get executed - ruby-on-rails

Question

I am hosting my app with Heroku, and have a task in the scheduler.rake file (to be called by Heroku Scheduler):
task :send_recipe_summary => :environment do
puts "Calling send recipe summary slack message job..."
SendRecipeSummarySlackMessageJob.perform_later
puts "Done!"
end
When this task gets called (by the scheduler or in the console) it says that the task gets enqueued:
➜ Plant-as-Usual-2 git:(master) heroku run bundle exec rake send_recipe_summary
Running bundle exec rake send_recipe_summary on ⬢ plant-as-usual-2... up, run.5548 (Hobby)
Calling send recipe summary slack message job...
I, [2020-09-24T16:25:50.193685 #4] INFO -- : [ActiveJob] Enqueued SendRecipeSummarySlackMessageJob (Job ID: a4110651-a9fa-4030-96ef-db4caf64c7e5) to Async(default)
Done!
However, in the logs, the job does not get enqueued, and the Slack message never gets sent:
2020-09-24T16:25:35.913315+00:00 app[api]: Starting process with command `bundle exec rake send_recipe_summary` by user jonappleseed#email.com
2020-09-24T16:25:44.008993+00:00 heroku[run.5548]: Awaiting client
2020-09-24T16:25:44.039520+00:00 heroku[run.5548]: State changed from starting to up
2020-09-24T16:25:44.291580+00:00 heroku[run.5548]: Starting process with command `bundle exec rake send_recipe_summary`
2020-09-24T16:25:49.334067+00:00 app[worker.1]: D, [2020-09-24T16:25:49.333949 #4] DEBUG -- : [1m[36mDelayed::Backend::ActiveRecord::Job Load (1.5ms)[0m [1m[37mUPDATE "delayed_jobs" SET locked_at = '2020-09-24 16:25:49.331558', locked_by = 'host:9b1fc7b1-4107-427f-8f49-f058b41b7906 pid:4' WHERE id IN (SELECT "delayed_jobs"."id" FROM "delayed_jobs" WHERE ((run_at <= '2020-09-24 16:25:49.330595' AND (locked_at IS NULL OR locked_at < '2020-09-24 12:25:49.330627') OR locked_by = 'host:9b1fc7b1-4107-427f-8f49-f058b41b7906 pid:4') AND failed_at IS NULL) ORDER BY priority ASC, run_at ASC LIMIT 1 FOR UPDATE) RETURNING *[0m
2020-09-24T16:25:53.372387+00:00 heroku[run.5548]: Process exited with status 0
2020-09-24T16:25:53.407641+00:00 heroku[run.5548]: State changed from up to complete
2020-09-24T16:26:49.394474+00:00 app[worker.1]: D, [2020-09-24T16:26:49.394376 #4] DEBUG -- : [1m[36mDelayed::Backend::ActiveRecord::Job Load (1.5ms)[0m [1m[37mUPDATE "delayed_jobs" SET locked_at = '2020-09-24 16:26:49.392377', locked_by = 'host:9b1fc7b1-4107-427f-8f49-f058b41b7906 pid:4' WHERE id IN (SELECT "delayed_jobs"."id" FROM "delayed_jobs" WHERE ((run_at <= '2020-09-24 16:26:49.391803' AND (locked_at IS NULL OR locked_at < '2020-09-24 12:26:49.391827') OR locked_by = 'host:9b1fc7b1-4107-427f-8f49-f058b41b7906 pid:4') AND failed_at IS NULL) ORDER BY priority ASC, run_at ASC LIMIT 1 FOR UPDATE) RETURNING *[0m
However, if I run the job itself (rather than the task), everything works as expected, and the message does get sent:
irb(main):002:0> SendRecipeSummarySlackMessageJob.perform_later
I, [2020-09-24T16:22:45.268729 #4] INFO -- : [ActiveJob] Enqueued SendRecipeSummarySlackMessageJob (Job ID: 8285bb7f-9646-42bb-9901-8d219ca1175c) to Async(default)
=> #<SendRecipeSummarySlackMessageJob:0x000055b1a768dfb8 #arguments=[], #job_id="8285bb7f-9646-42bb-9901-8d219ca1175c", #queue_name="default", #priority=nil, #executions=0, #exception_executions={}, #provider_job_id="c41cedd7-e5a5-4a7d-9e64-280d2ec81e1e">
irb(main):003:0> I, [2020-09-24T16:22:45.269348 #4] INFO -- : [ActiveJob] [SendRecipeSummarySlackMessageJob] [8285bb7f-9646-42bb-9901-8d219ca1175c] Performing SendRecipeSummarySlackMessageJob (Job ID: 8285bb7f-9646-42bb-9901-8d219ca1175c) from Async(default) enqueued at 2020-09-24T16:22:45Z
D, [2020-09-24T16:22:46.412105 #4] DEBUG -- : [ActiveJob] [SendRecipeSummarySlackMessageJob] [8285bb7f-9646-42bb-9901-8d219ca1175c] (1.5ms) SELECT COUNT(*) FROM "recipes" WHERE "recipes"."state" = $1 [["state", "awaiting_approval"]]
D, [2020-09-24T16:22:46.413683 #4] DEBUG -- : [ActiveJob] [SendRecipeSummarySlackMessageJob] [8285bb7f-9646-42bb-9901-8d219ca1175c] (1.0ms) SELECT COUNT(*) FROM "recipes" WHERE "recipes"."state" = $1 [["state", "incomplete"]]
I, [2020-09-24T16:22:46.415123 #4] INFO -- : [ActiveJob] [SendRecipeSummarySlackMessageJob] [8285bb7f-9646-42bb-9901-8d219ca1175c] Enqueued SendSlackMessageJob (Job ID: c640b706-9920-4639-a1a0-4c7dbec15c39) to Async(default) with arguments: "There are no recipes awaiting approval, and 1 incomplete recipe https://www.plantasusual.com/admin", {:nature=>"inform"}
I, [2020-09-24T16:22:46.415260 #4] INFO -- : [ActiveJob] [SendRecipeSummarySlackMessageJob] [8285bb7f-9646-42bb-9901-8d219ca1175c] Performed SendRecipeSummarySlackMessageJob (Job ID: 8285bb7f-9646-42bb-9901-8d219ca1175c) from Async(default) in 1145.43ms
I, [2020-09-24T16:22:46.415882 #4] INFO -- : [ActiveJob] [SendSlackMessageJob] [c640b706-9920-4639-a1a0-4c7dbec15c39] Performing SendSlackMessageJob (Job ID: c640b706-9920-4639-a1a0-4c7dbec15c39) from Async(default) enqueued at 2020-09-24T16:22:46Z with arguments: "There are no recipes awaiting approval, and 1 incomplete recipe https://www.plantasusual.com/admin", {:nature=>"inform"}
I, [2020-09-24T16:22:46.591446 #4] INFO -- : [ActiveJob] [SendSlackMessageJob] [c640b706-9920-4639-a1a0-4c7dbec15c39] Performed SendSlackMessageJob (Job ID: c640b706-9920-4639-a1a0-4c7dbec15c39) from Async(default) in 175.12ms
Can anyone help me understand why the job runs as expected when run from the console, but it doesn't work when run from the scheduler?
Thank you to anyone who can help!

Answer 1

It seems you have not enabled worker on heroku bundle exec rake jobs:work.
It is a paid service. goto: your_app > resource tab and enable it from there. this link could be helpful