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'delayed_jobs'宝石未在Heroku上迁移

[英]'delayed_jobs' gem not migrating on heroku

Please see update at bottom 请参阅底部的更新


I'm trying to use the 'delayed_jobs' gem in my project. 我正在尝试在项目中使用“ delayed_jobs” gem。 I got everything working in my local environment, however when I moved the project to production on Heroku I was unable to 'rake db:migrate', and am not able to get my server started. 我可以在本地环境中正常工作,但是当我将项目移至Heroku上的生产环境时,我无法“ rake db:migrate”,也无法启动服务器。 Here are the steps I followed. 这是我遵循的步骤。

*Run bundle_install with 'delayed_job' and 'delayed_job_active_record' in my gem file *在我的gem文件中运行带有'delayed_job'和'delayed_job_active_record'的bundle_install
*I did not run 'ails generate delayed_job:active_record' as the migration file was moved to the server from when I ran 'ails generate delayed_job:active_record' in DEV *从迁移文件从我在DEV中运行'ails generate delay_job:active_record'时开始将迁移文件移动到服务器后,我没有运行'ails generate delay_job:active_record'
*I ran rake db:migrate and it failed with the following error, not sure how to fix. *我运行了rake db:migrate,但失败并显示以下错误,不确定如何解决。 (Note: It appears that the migration is failing due to the table not existing, which is a big issue as I need to run the migration to create the table). (注意:由于表不存在,迁移似乎失败了,这是一个大问题,因为我需要运行迁移来创建表)。

[?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 I figured out the problem was caused by executing the following code at the initialization of my rails app. 更新我发现问题是由在我的rails应用程序初始化时执行以下代码引起的。 I was able to get the migration to work by temporarily removing it, and then adding it back in after the migration was complete (the code require the migration to be run before it was run). 通过暂时删除它,然后在迁移完成后将其重新添加,我能够使迁移工作(代码要求在运行迁移之前先运行迁移)。 This is a temporary patch so I am going to work on getting a better solution for future PROD pushes. 这是一个临时补丁,因此我将为将来的PROD推送寻求更好的解决方案。 I'm thinking I can find a way to check if the table exists before running the code, but if anyone knows of a better way please let me know. 我在想我可以找到一种在运行代码之前检查表是否存在的方法,但是如果有人知道更好的方法,请告诉我。

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

You can check if a table exists, and therefore if migrations have been run: 您可以检查表是否存在,并因此检查是否已运行迁移:

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

That answer is also in SO here . 这个答案也在这里

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