我正在使用'delayed_job_active_record'gem在Rails 5项目上使用延迟的作业。
我不知道如何检查工作状态。
我设法延误了工作。由于处理上传文件的问题（这是另一个问题），作业失败。
在我的控制器中：
def create
@upload = Upload.create(status: "in progress")
@upload.delay.create_ln(lecture_note_params, current_user, @upload.id)
render json: {"status": @upload.status, "id": @upload.id}, status: 200
end
这是我的上传模型的模型代码：
class Upload < ApplicationRecord
def create_ln(lecture_note_params, current_user, upload_id)
@lecture_note = LectureNote.new(lecture_note_params.merge(user: current_user))
@lecture_note.upload_id = upload_id
if @lecture_note.save
#nothing
else
logger.info @lecture_note.errors.full_messages.to_sentence
@upload.update(error: @lecture_note.errors.full_messages.to_sentence, status: "error")
end
end
end
讲义不保存。它们由于上述原因而失败。我需要上传模型来更新错误状态。我该怎么办？
我可以在控制台中看到延迟的工作：
irb(main):002:0> ap Delayed::Job.last
D, [2019-12-12T06:12:08.014249 #4] DEBUG -- : Delayed::Backend::ActiveRecord::Job Load (6.3ms) SELECT `delayed_jobs`.* FROM `delayed_jobs` ORDER BY `delayed_jobs`.`id` DESC LIMIT 1
#<Delayed::Backend::ActiveRecord::Job:0x0000561edb710f70> {
:id => 16,
:priority => 0,
:attempts => 1,
:handler => "### ALL KINDS OF STUFF - REDACTED ###",
:run_at => Thu, 12 Dec 2019 06:10:32 UTC +00:00,
:locked_at => nil,
:failed_at => Thu, 12 Dec 2019 06:11:17 UTC +00:00,
:locked_by => nil,
:queue => nil,
:created_at => Thu, 12 Dec 2019 06:10:32 UTC +00:00,
:updated_at => Thu, 12 Dec 2019 06:11:17 UTC +00:00
}
作业失败后，“ failed_at”字段将更新。如何访问并更新我的上传模型？
这里是文件上传时的日志文件：
D, [2019-12-12T06:11:17.846638 #4] DEBUG -- : Upload Load (1.1ms) SELECT `uploads`.* FROM `uploads` WHERE `uploads`.`id` = 31 LIMIT 1
D, [2019-12-12T06:11:17.852741 #4] DEBUG -- : User Load (1.4ms) SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 LIMIT 1
[Worker(host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4)] Job Upload#create_ln (id=16) RUNNING
I, [2019-12-12T06:11:17.853180 #4] INFO -- : 2019-12-12T06:11:17+0000: [Worker(host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4)] Job Upload#create_ln (id=16) RUNNING
D, [2019-12-12T06:11:17.855002 #4] DEBUG -- : (1.2ms) BEGIN
I, [2019-12-12T06:11:17.855200 #4] INFO -- : pdf to html running..............
I, [2019-12-12T06:11:17.855268 #4] INFO -- : step 0 ..............
I, [2019-12-12T06:11:17.855326 #4] INFO -- : step 1 ..............
I, [2019-12-12T06:11:17.855388 #4] INFO -- : step 2 ..............
D, [2019-12-12T06:11:17.856673 #4] DEBUG -- : (1.1ms) ROLLBACK
[Worker(host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4)] Job Upload#create_ln (id=16) FAILED (0 prior attempts) with IOError: uninitialized stream
E, [2019-12-12T06:11:17.857261 #4] ERROR -- : 2019-12-12T06:11:17+0000: [Worker(host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4)] Job Upload#create_ln (id=16) FAILED (0 prior attempts) with IOError: uninitialized stream
[Worker(host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4)] Job Upload#create_ln (id=16) FAILED permanently because of 1 consecutive failures
E, [2019-12-12T06:11:17.857416 #4] ERROR -- : 2019-12-12T06:11:17+0000: [Worker(host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4)] Job Upload#create_ln (id=16) FAILED permanently because of 1 consecutive failures
D, [2019-12-12T06:11:17.858576 #4] DEBUG -- : (0.9ms) BEGIN
D, [2019-12-12T06:11:17.861961 #4] DEBUG -- : SQL (1.6ms) UPDATE `delayed_jobs` SET `last_error` = 'uninitialized stream\n/app/vendor/ruby-2.6.3/lib/ruby/2.6.0/tempfile.rb:221:in `path\'\n/app/vendor/ruby-2.6.3/lib/ruby/2.6.0/tempfile.rb:221:in `path\'\n/app/app/models/lecture_note.rb:60:in `pdf_to_html\'\n/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.0.7.1/lib/active_support/callbacks.rb:382:in `block in make_lambda\'\n/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.0.7.1/lib/active_support/callbacks.rb:150:in `block (2 levels) in halting_and_conditional\'\n/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.0.7.1/lib/active_support/callbacks.rb:770:in `block (2 levels) in deprecated_false_terminator\'\n/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.0.7.1/lib/active_support/callbacks.rb:769:in `catch\'\n/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.0.7.1/lib/active_support/callbacks.rb:769:in `block in deprecated_false_terminator\'\n/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.0.7.1/lib/active_support/callbacks.rb:151:in `block in halting_and_conditional\'\n/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.0.7.1/lib/active_support/callbacks.rb:454:in `block in call\'\n/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.0.7.1/lib/active_support/callbacks.rb:454:in `each\'\n/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.0.7.1/lib/active_support/callbacks.rb:454:in `call\'\n/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.0.7.1/lib/active_support/callbacks.rb:101:in `__run_callbacks__\'\n/app/vendor/bundle/ruby/2.6.0/gems/activesupport-5.0.7.1/lib/active_support/callbacks.rb:750:in `_run_validation_callbacks\'\n/app/vendor/bundle/ruby/2.6.0/gems/activemodel-5.0.7.1/lib/active_model/validations/callbacks.rb:113:in `run_validations!\'\n/app/vendor/bundle/ruby/2.6.0/gems/activemodel-5.0.7.1/lib/active_model/validations.rb:338:in `valid?\'\n/app/vendor/bundle/ruby/2.6.0/gems/activerecord-5.0.7.1/lib/active_record/validations.rb:65:in `valid?\'\n/app/vendor/bundle/ruby/2.6.0/gems/activerecord-5.0.7.1/lib/active_record/validations.rb:82:in `perform_validations\'\n/app/vendor/bundle/ruby/2.6.0/gems/activerecord-5.0.7.1/lib/active_record/validations.rb:44:in `save\'\n/app/vendor/bundle/ruby/2.6.0/gems/activerecord-5.0.7.1/lib/active_record/attribute_methods/dirty.rb:22:in `save\'\n/app/vendor/bundle/ruby/2.6.0/gems/activerecord-5.0.7.1/lib/active_record/transactions.rb:319:in `block (2 levels) in save\'\n/app/vendor/bundle/ruby/2.6.0/gems/activerecord-5.0.7.1/lib/active_record/transactions.rb:395:in `block in with_transaction_returning_status\'\n/app/vendor/bundle/ruby/2.6.0/gems/activerecord-5.0.7.1/lib/active_record/connection_adapters/abstract/database_statements.rb:232:in `block in transaction\'\n/app/vendor/bundle/ruby/2.6.0/gems/activerecord-5.0.7.1/lib/active_record/connection_adapters/abstract/transaction.rb:189:in `within_new_transaction\'\n/app/vendor/bundle/ruby/2.6.0/gems/activerecord-5.0.7.1/lib/active_record/connection_adapters/abstract/database_statements.rb:232:in `transaction\'\n/app/vendor/bundle/ruby/2.6.0/gems/activerecord-5.0.7.1/lib/active_record/transactions.rb:211:in `transaction\'\n/app/vendor/bundle/ruby/2.6.0/gems/activerecord-5.0.7.1/lib/active_record/transactions.rb:392:in `with_transaction_returning_status\'\n/app/vendor/bundle/ruby/2.6.0/gems/activerecord-5.0.7.1/lib/active_record/transactions.rb:319:in `block in save\'\n/app/vendor/bundle/ruby/2.6.0/gems/activerecord-5.0.7.1/lib/active_record/transactions.rb:334:in `rollback_active_record_state!\'\n/app/vendor/bundle/ruby/2.6.0/gems/activerecord-5.0.7.1/lib/active_record/transactions.rb:318:in `save\'\n/app/vendor/bundle/ruby/2.6.0/gems/activerecord-5.0.7.1/lib/active_record/suppressor.rb:41:in `save\'\n/app/app/models/upload.rb:7:in `create_ln\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/performable_method.rb:26:in `perform\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/backend/base.rb:81:in `block in invoke_job\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/lifecycle.rb:61:in `block in initialize\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/lifecycle.rb:66:in `execute\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/lifecycle.rb:40:in `run_callbacks\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/backend/base.rb:78:in `invoke_job\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/worker.rb:230:in `block (2 levels) in run\'\n/app/vendor/ruby-2.6.3/lib/ruby/2.6.0/timeout.rb:93:in `block in timeout\'\n/app/vendor/ruby-2.6.3/lib/ruby/2.6.0/timeout.rb:103:in `timeout\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/worker.rb:230:in `block in run\'\n/app/vendor/ruby-2.6.3/lib/ruby/2.6.0/benchmark.rb:308:in `realtime\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/worker.rb:229:in `run\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/worker.rb:312:in `block in reserve_and_run_one_job\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/lifecycle.rb:61:in `block in initialize\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/lifecycle.rb:66:in `execute\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/lifecycle.rb:40:in `run_callbacks\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/worker.rb:312:in `reserve_and_run_one_job\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/worker.rb:213:in `block in work_off\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/worker.rb:212:in `times\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/worker.rb:212:in `work_off\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/worker.rb:175:in `block (4 levels) in start\'\n/app/vendor/ruby-2.6.3/lib/ruby/2.6.0/benchmark.rb:308:in `realtime\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/worker.rb:174:in `block (3 levels) in start\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/lifecycle.rb:61:in `block in initialize\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/lifecycle.rb:66:in `execute\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/lifecycle.rb:40:in `run_callbacks\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/worker.rb:173:in `block (2 levels) in start\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/worker.rb:172:in `loop\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/worker.rb:172:in `block in start\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/plugins/clear_locks.rb:7:in `block (2 levels) in <class:ClearLocks>\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/lifecycle.rb:79:in `block (2 levels) in add\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/lifecycle.rb:61:in `block in initialize\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/lifecycle.rb:79:in `block in add\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/lifecycle.rb:66:in `execute\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/lifecycle.rb:40:in `run_callbacks\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/worker.rb:171:in `start\'\n/app/vendor/bundle/ruby/2.6.0/gems/delayed_job-4.1.8/lib/delayed/tasks.rb:9:in `block (2 levels) in <top (required)>\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/task.rb:273:in `block in execute\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/task.rb:273:in `each\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/task.rb:273:in `execute\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/task.rb:214:in `block in invoke_with_call_chain\'\n/app/vendor/ruby-2.6.3/lib/ruby/2.6.0/monitor.rb:230:in `mon_synchronize\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/task.rb:194:in `invoke_with_call_chain\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/task.rb:183:in `invoke\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/application.rb:160:in `invoke_task\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/application.rb:116:in `block (2 levels) in top_level\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/application.rb:116:in `each\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/application.rb:116:in `block in top_level\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/application.rb:125:in `run_with_threads\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/application.rb:110:in `top_level\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/application.rb:83:in `block in run\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/application.rb:186:in `standard_exception_handling\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/lib/rake/application.rb:80:in `run\'\n/app/vendor/bundle/ruby/2.6.0/gems/rake-12.3.3/exe/rake:27:in `<top (required)>\'\n/app/vendor/bundle/ruby/2.6.0/bin/rake:23:in `load\'\n/app/vendor/bundle/ruby/2.6.0/bin/rake:23:in `<top (required)>\'\n/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/cli/exec.rb:74:in `load\'\n/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/cli/exec.rb:74:in `kernel_load\'\n/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/cli/exec.rb:28:in `run\'\n/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/cli.rb:463:in `exec\'\n/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run\'\n/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command\'\n/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/vendor/thor/lib/thor.rb:387:in `dispatch\'\n/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/cli.rb:27:in `dispatch\'\n/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/vendor/thor/lib/thor/base.rb:466:in `start\'\n/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/cli.rb:18:in `start\'\n/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/exe/bundle:30:in `block in <top (required)>\'\n/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/lib/bundler/friendly_errors.rb:124:in `with_friendly_errors\'\n/app/vendor/bundle/ruby/2.6.0/gems/bundler-1.17.3/exe/bundle:22:in `<top (required)>\'\n/app/bin/bundle:3:in `load\'\n/app/bin/bundle:3:in `<main>\'', `attempts` = 1, `failed_at` = '2019-12-12 06:11:17', `updated_at` = '2019-12-12 06:11:17' WHERE `delayed_jobs`.`id` = 16
D, [2019-12-12T06:11:17.867680 #4] DEBUG -- : (5.1ms) COMMIT
D, [2019-12-12T06:11:17.870699 #4] DEBUG -- : SQL (1.8ms) UPDATE `delayed_jobs` SET `delayed_jobs`.`locked_at` = '2019-12-12 06:11:17', `delayed_jobs`.`locked_by` = 'host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4' WHERE ((run_at <= '2019-12-12 06:11:17.867786' AND (locked_at IS NULL OR locked_at < '2019-12-12 02:11:17.867819') OR locked_by = 'host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4') AND failed_at IS NULL) ORDER BY priority ASC, run_at ASC LIMIT 1
[Worker(host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4)] 8 jobs processed at 13.8130 j/s, 8 failed
I, [2019-12-12T06:11:17.870885 #4] INFO -- : 2019-12-12T06:11:17+0000: [Worker(host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4)] 8 jobs processed at 13.8130 j/s, 8 failed
D, [2019-12-12T06:11:17.873258 #4] DEBUG -- : SQL (1.2ms) UPDATE `delayed_jobs` SET `delayed_jobs`.`locked_at` = '2019-12-12 06:11:17', `delayed_jobs`.`locked_by` = 'host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4' WHERE ((run_at <= '2019-12-12 06:11:17.870973' AND (locked_at IS NULL OR locked_at < '2019-12-12 02:11:17.871010') OR locked_by = 'host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4') AND failed_at IS NULL) ORDER BY priority ASC, run_at ASC LIMIT 1
D, [2019-12-12T06:11:22.878755 #4] DEBUG -- : SQL (1.5ms) UPDATE `delayed_jobs` SET `delayed_jobs`.`locked_at` = '2019-12-12 06:11:22', `delayed_jobs`.`locked_by` = 'host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4' WHERE ((run_at <= '2019-12-12 06:11:22.876103' AND (locked_at IS NULL OR locked_at < '2019-12-12 02:11:22.876164') OR locked_by = 'host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4') AND failed_at IS NULL) ORDER BY priority ASC, run_at ASC LIMIT 1
D, [2019-12-12T06:11:27.882776 #4] DEBUG -- : SQL (1.6ms) UPDATE `delayed_jobs` SET `delayed_jobs`.`locked_at` = '2019-12-12 06:11:27', `delayed_jobs`.`locked_by` = 'host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4' WHERE ((run_at <= '2019-12-12 06:11:27.880101' AND (locked_at IS NULL OR locked_at < '2019-12-12 02:11:27.880160') OR locked_by = 'host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4') AND failed_at IS NULL) ORDER BY priority ASC, run_at ASC LIMIT 1
D, [2019-12-12T06:11:32.890712 #4] DEBUG -- : SQL (1.6ms) UPDATE `delayed_jobs` SET `delayed_jobs`.`locked_at` = '2019-12-12 06:11:32', `delayed_jobs`.`locked_by` = 'host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4' WHERE ((run_at <= '2019-12-12 06:11:32.887163' AND (locked_at IS NULL OR locked_at < '2019-12-12 02:11:32.887243') OR locked_by = 'host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4') AND failed_at IS NULL) ORDER BY priority ASC, run_at ASC LIMIT 1
D, [2019-12-12T06:11:37.894751 #4] DEBUG -- : SQL (1.5ms) UPDATE `delayed_jobs` SET `delayed_jobs`.`locked_at` = '2019-12-12 06:11:37', `delayed_jobs`.`locked_by` = 'host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4' WHERE ((run_at <= '2019-12-12 06:11:37.892094' AND (locked_at IS NULL OR locked_at < '2019-12-12 02:11:37.892153') OR locked_by = 'host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4') AND failed_at IS NULL) ORDER BY priority ASC, run_at ASC LIMIT 1
^C[Worker(host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4)] Exiting...
I, [2019-12-12T06:11:39.976787 #4] INFO -- : 2019-12-12T06:11:39+0000: [Worker(host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4)] Exiting...
D, [2019-12-12T06:11:42.902214 #4] DEBUG -- : SQL (5.4ms) UPDATE `delayed_jobs` SET `delayed_jobs`.`locked_by` = NULL, `delayed_jobs`.`locked_at` = NULL WHERE `delayed_jobs`.`locked_by` = 'host:575e618d-28f3-49a1-8545-88afa11b60d1 pid:4'
确定，我找到了解决方案。 Tun的回答将我指向了大方向（非常大的方向），但引导我走向了这个方向。
delayed_job具有回调，但是我不知道将它们放在哪里或如何使用它们。他们只是进入执行工作方法的模型。这在可用的文档中并不明显（无论如何对我而言）。
我看错了方向。我已经有上载课程来管理讲义的创建。因此，使用回调，我可以让工作用状态更新类。这就是我们最终需要的。
def failure(job)方法成功了！
我不是100％理解这些回调实际上如何在后台工作，但它们确实起作用。
class Upload < ApplicationRecord
def create_ln(lecture_note_params, current_user, upload_id)
@lecture_note = LectureNote.new(lecture_note_params.merge(user: current_user))
@lecture_note.upload_id = upload_id
# if @lecture_note.save
# #nothing
# else
# logger.info @lecture_note.errors.full_messages.to_sentence
# @upload.update(error: @lecture_note.errors.full_messages.to_sentence, status: "error")
# end
begin
@lecture_note.save
rescue Exception => e
puts @lecture_note.errors.full_messages.to_sentence
self.update(error: @lecture_note.errors.full_messages.to_sentence, status: "error")
end
end
def success(job)
puts "Job complete ------->"
end
def error(job, exception)
puts "Job failed ERROR ------->"
puts @lecture_note.errors.full_messages.to_sentence
self.update(error: @lecture_note.errors.full_messages.to_sentence, status: "error")
end
# def after(job)
# # Do something useful here
# end
def failure(job)
puts "Job failed FAILURE ------->"
puts @lecture_note.errors.full_messages.to_sentence
self.update(error: @lecture_note.errors.full_messages.to_sentence, status: "error")
end
end
[通常，我们不应该检查作业。该作业应报告。 （观察者模式-我认为）
我通常会执行以下一项或多项操作
DelayedJob proposed Global Hooks，但我认为尚未实现。