0

Bitte siehe Update unten‚delayed_jobs‘ Juwel nicht auf Heroku Migration


Ich versuche, das ‚delayed_jobs‘ Juwel in meinem Projekt zu verwenden. Ich habe alles in meiner lokalen Umgebung laufen lassen, aber als ich das Projekt in die Produktion auf Heroku verlagerte, konnte ich "db: migrate" nicht rackern und konnte meinen Server nicht starten. Hier sind die Schritte, denen ich gefolgt bin.

* Führen Sie bundle_install mit ‚delayed_job‘ und ‚delayed_job_active_record‘ in meinem gem Datei
* ich nicht laufen ‚krankt erzeugen delayed_job: active_record‘, wie die Migrationsdatei auf den Server von verschoben wurde, als ich lief ‚krankt erzeugen delayed_job : active_record 'in DEV
* Ich lief rake db: migrieren und es ist mit dem folgenden Fehler fehlgeschlagen, nicht sicher, wie zu beheben. (Hinweis: Es scheint, dass die Migration fehlschlägt, weil die Tabelle nicht existiert. Dies ist ein großes Problem, da ich die Migration ausführen muss, um die Tabelle zu erstellen).

 
[?25l[?25hUnable to write PID file to /app/tmp/pids/delayed_job.pid 
[ActiveJob] Enqueued SquareOrderCleanupJob (Job ID: c364f5c1-a3c3-401a-95a6-a567a2813942) to DelayedJob(default) at 2016-06-04 14:57:56 UTC 
[ActiveJob] Mysql2::Error: Table 'heroku_fc2daea183dcdd6.delayed_jobs' doesn't exist: SHOW FULL FIELDS FROM `delayed_jobs` 
rake aborted! 
ActiveRecord::StatementInvalid: Mysql2::Error: Table 'heroku_fc2daea183dcdd6.delayed_jobs' doesn't exist: SHOW FULL FIELDS FROM `delayed_jobs` 
/app/vendor/bundle/ruby/2.2.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:80:in `_query' 
/app/vendor/bundle/ruby/2.2.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:80:in `block in query' 
/app/vendor/bundle/ruby/2.2.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:79:in `handle_interrupt' 
/app/vendor/bundle/ruby/2.2.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:79:in `query' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:305:in `block in execute' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract_adapter.rb:467:in `log' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:305:in `execute' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/mysql2_adapter.rb:231:in `execute' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:312:in `execute_and_free' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:457:in `columns' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/schema_cache.rb:43:in `columns' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/attributes.rb:93:in `columns' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/attributes.rb:98:in `columns_hash' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/inheritance.rb:205:in `subclass_from_attributes?' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/inheritance.rb:54:in `new' 
/app/vendor/bundle/ruby/2.2.0/gems/delayed_job-4.1.2/lib/delayed/backend/base.rb:16:in `enqueue_job' 
/app/vendor/bundle/ruby/2.2.0/gems/delayed_job-4.1.2/lib/delayed/backend/base.rb:12:in `enqueue' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/queue_adapters/delayed_job_adapter.rb:22:in `enqueue_at' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/enqueuing.rb:69:in `block in enqueue' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:115:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:115:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:553:in `block (2 levels) in compile' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:503:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:503:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:496:in `block (2 levels) in around' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:341:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:341:in `block (2 levels) in simple' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/logging.rb:14:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/logging.rb:14:in `block (3 levels) in ' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/logging.rb:43:in `block in tag_logger' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/tagged_logging.rb:68:in `block in tagged' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/tagged_logging.rb:26:in `tagged' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/tagged_logging.rb:68:in `tagged' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/logging.rb:43:in `tag_logger' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/logging.rb:13:in `block (2 levels) in ' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:439:in `instance_exec' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:439:in `block in make_lambda' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:340:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:340:in `block in simple' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:495:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:495:in `block in around' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:503:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:503:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:88:in `run_callbacks' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/enqueuing.rb:67:in `enqueue' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/configured_job.rb:13:in `perform_later' 
/app/config/initializers/schedule_jobs.rb:2:in `' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:in `load' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:in `block in load' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:240:in `load_dependency' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:in `load' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/engine.rb:652:in `block in load_config_initializer' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/notifications.rb:166:in `instrument' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/engine.rb:651:in `load_config_initializer' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/engine.rb:616:in `block (2 levels) in ' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/engine.rb:615:in `each' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/engine.rb:615:in `block in ' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:30:in `instance_exec' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:30:in `run' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:55:in `block in run_initializers' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:44:in `each' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:44:in `tsort_each_child' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:44:in `each' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:44:in `tsort_each_child' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:54:in `run_initializers' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/application.rb:352:in `initialize!' 
/app/config/environment.rb:5:in `' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `require' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `block in require' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:240:in `load_dependency' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `require' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/application.rb:328:in `require_environment!' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/application.rb:457:in `block in run_tasks_blocks' 
Mysql2::Error: Table 'heroku_fc2daea183dcdd6.delayed_jobs' doesn't exist 
/app/vendor/bundle/ruby/2.2.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:80:in `_query' 
/app/vendor/bundle/ruby/2.2.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:80:in `block in query' 
/app/vendor/bundle/ruby/2.2.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:79:in `handle_interrupt' 
/app/vendor/bundle/ruby/2.2.0/gems/mysql2-0.3.21/lib/mysql2/client.rb:79:in `query' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:305:in `block in execute' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract_adapter.rb:467:in `log' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:305:in `execute' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/mysql2_adapter.rb:231:in `execute' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:312:in `execute_and_free' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:457:in `columns' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/connection_adapters/schema_cache.rb:43:in `columns' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/attributes.rb:93:in `columns' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/attributes.rb:98:in `columns_hash' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/inheritance.rb:205:in `subclass_from_attributes?' 
/app/vendor/bundle/ruby/2.2.0/gems/activerecord-4.2.3/lib/active_record/inheritance.rb:54:in `new' 
/app/vendor/bundle/ruby/2.2.0/gems/delayed_job-4.1.2/lib/delayed/backend/base.rb:16:in `enqueue_job' 
/app/vendor/bundle/ruby/2.2.0/gems/delayed_job-4.1.2/lib/delayed/backend/base.rb:12:in `enqueue' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/queue_adapters/delayed_job_adapter.rb:22:in `enqueue_at' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/enqueuing.rb:69:in `block in enqueue' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:115:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:115:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:553:in `block (2 levels) in compile' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:503:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:503:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:496:in `block (2 levels) in around' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:341:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:341:in `block (2 levels) in simple' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/logging.rb:14:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/logging.rb:14:in `block (3 levels) in ' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/logging.rb:43:in `block in tag_logger' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/tagged_logging.rb:68:in `block in tagged' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/tagged_logging.rb:26:in `tagged' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/tagged_logging.rb:68:in `tagged' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/logging.rb:43:in `tag_logger' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/logging.rb:13:in `block (2 levels) in ' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:439:in `instance_exec' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:439:in `block in make_lambda' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:340:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:340:in `block in simple' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:495:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:495:in `block in around' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:503:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:503:in `call' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:88:in `run_callbacks' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/enqueuing.rb:67:in `enqueue' 
/app/vendor/bundle/ruby/2.2.0/gems/activejob-4.2.3/lib/active_job/configured_job.rb:13:in `perform_later' 
/app/config/initializers/schedule_jobs.rb:2:in `' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:in `load' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:in `block in load' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:240:in `load_dependency' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:268:in `load' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/engine.rb:652:in `block in load_config_initializer' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/notifications.rb:166:in `instrument' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/engine.rb:651:in `load_config_initializer' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/engine.rb:616:in `block (2 levels) in ' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/engine.rb:615:in `each' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/engine.rb:615:in `block in ' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:30:in `instance_exec' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:30:in `run' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:55:in `block in run_initializers' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:44:in `each' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:44:in `tsort_each_child' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:44:in `each' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:44:in `tsort_each_child' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/initializable.rb:54:in `run_initializers' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/application.rb:352:in `initialize!' 
/app/config/environment.rb:5:in `' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `require' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `block in require' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:240:in `load_dependency' 
/app/vendor/bundle/ruby/2.2.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `require' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/application.rb:328:in `require_environment!' 
/app/vendor/bundle/ruby/2.2.0/gems/railties-4.2.3/lib/rails/application.rb:457:in `block in run_tasks_blocks' 
Tasks: TOP => db:migrate => environment 
(See full trace by running task with --trace) 
[?25h 




UPDATE habe ich herausgefunden das Problem durch Ausführen des folgenden Code bei der Initialisierung meiner Rails-Anwendung verursacht wurde. Ich konnte die Migration zum Laufen bringen, indem ich sie vorübergehend entfernte und sie nach Abschluss der Migration wieder einfügte (der Code erfordert, dass die Migration vor der Ausführung ausgeführt wurde). Dies ist ein temporärer Patch, daher werde ich daran arbeiten, eine bessere Lösung für zukünftige PROD-Pushs zu finden. Ich denke, ich kann einen Weg finden, um zu überprüfen, ob die Tabelle existiert, bevor Sie den Code ausführen, aber wenn jemand einen besseren Weg kennt, lassen Sie es mich bitte wissen.

system("ruby lib/background_job start") 
SquareOrderCleanupJob.set(wait: 10.minute).perform_later() 
at_exit do 
    system("ruby lib/background_job stop") 
end 

Antwort

0

Sie können überprüfen, ob eine Tabelle vorhanden ist, und daher, wenn Migrationen ausgeführt wurden:

ActiveRecord::Base.connection.table_exists? 'table_name' 

Diese Antwort ist auch SO here in.

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