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LoadError: Unable to autoload constant in Rails

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0

I am running a Rails application.

app/workers/sample/fetch_book_report_worker.rb

class Sample::FetchBookReportWorker
 // body
end

app/workers/sample/fetch_student_report_worker.rb

class Sample::FetchStudentReportWorker
 // body
end

app/workers/sample/fetch_teacher_report_worker.rb

class Sample::FetchTeacherReportWorker
 // body
end

app/workers/sample/fetch_college_report_worker.rb

class Sample::FetchCollegeReportWorker
 // body
end

When I ran the above worker individually, I didn't see an issue. But I ran all the workers at the same time. I got the below error.

LoadError: Unable to autoload constant Sample::FetchStudentReportWorker, expected /home/ubuntu/my-app/app/workers/sample/fetch_student_report_worker.rb to define it

How to solve this?

ruby-on-rails

share|improve this question

edited Apr 8 at 14:01

mohammad RaoofNia

24811 silver badge1111 bronze badges

asked Mar 28 at 12:19

GaletGalet

1,46577 gold badges4242 silver badges9191 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Could you put code where you call these classes?
  
  – barmic
  Mar 28 at 14:58
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @barmic For now, I am calling workers from Rails console? Originally it will be scheduled using whenever gem
  
  – Galet
  Mar 29 at 4:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Galet, can you post a command you use to run all workers from console?
  
  – Zlatko Alomerovic
  Apr 4 at 17:15
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I am calling the workers in rails console as below at the same time. Sample::FetchBookReportWorker.perform_async Sample::FetchStudentReportWorker.perform_async Sample::FetchTeacherReportWorker.perform_async Sample::FetchCollegeReportWorker.perform_async
  
  – Galet
  Apr 5 at 4:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Do you have app/workers/sample.rb that defines Sample module?
  
  – Vasfed
  Apr 5 at 21:50
  

  
  
  
  

 | 
show 3 more comments

0

I am running a Rails application.

app/workers/sample/fetch_book_report_worker.rb

class Sample::FetchBookReportWorker
 // body
end

app/workers/sample/fetch_student_report_worker.rb

class Sample::FetchStudentReportWorker
 // body
end

app/workers/sample/fetch_teacher_report_worker.rb

class Sample::FetchTeacherReportWorker
 // body
end

app/workers/sample/fetch_college_report_worker.rb

class Sample::FetchCollegeReportWorker
 // body
end

When I ran the above worker individually, I didn't see an issue. But I ran all the workers at the same time. I got the below error.

LoadError: Unable to autoload constant Sample::FetchStudentReportWorker, expected /home/ubuntu/my-app/app/workers/sample/fetch_student_report_worker.rb to define it

How to solve this?

ruby-on-rails

share|improve this question

edited Apr 8 at 14:01

mohammad RaoofNia

24811 silver badge1111 bronze badges

asked Mar 28 at 12:19

GaletGalet

1,46577 gold badges4242 silver badges9191 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Could you put code where you call these classes?
  
  – barmic
  Mar 28 at 14:58
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @barmic For now, I am calling workers from Rails console? Originally it will be scheduled using whenever gem
  
  – Galet
  Mar 29 at 4:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Galet, can you post a command you use to run all workers from console?
  
  – Zlatko Alomerovic
  Apr 4 at 17:15
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I am calling the workers in rails console as below at the same time. Sample::FetchBookReportWorker.perform_async Sample::FetchStudentReportWorker.perform_async Sample::FetchTeacherReportWorker.perform_async Sample::FetchCollegeReportWorker.perform_async
  
  – Galet
  Apr 5 at 4:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Do you have app/workers/sample.rb that defines Sample module?
  
  – Vasfed
  Apr 5 at 21:50
  

  
  
  
  

 | 
show 3 more comments

I am running a Rails application.

app/workers/sample/fetch_book_report_worker.rb

class Sample::FetchBookReportWorker
 // body
end

app/workers/sample/fetch_student_report_worker.rb

class Sample::FetchStudentReportWorker
 // body
end

app/workers/sample/fetch_teacher_report_worker.rb

class Sample::FetchTeacherReportWorker
 // body
end

app/workers/sample/fetch_college_report_worker.rb

class Sample::FetchCollegeReportWorker
 // body
end

When I ran the above worker individually, I didn't see an issue. But I ran all the workers at the same time. I got the below error.

LoadError: Unable to autoload constant Sample::FetchStudentReportWorker, expected /home/ubuntu/my-app/app/workers/sample/fetch_student_report_worker.rb to define it

How to solve this?

ruby-on-rails

share|improve this question

edited Apr 8 at 14:01

mohammad RaoofNia

24811 silver badge1111 bronze badges

asked Mar 28 at 12:19

GaletGalet

1,46577 gold badges4242 silver badges9191 bronze badges

class Sample::FetchBookReportWorker
 // body
end

class Sample::FetchStudentReportWorker
 // body
end

class Sample::FetchTeacherReportWorker
 // body
end

class Sample::FetchCollegeReportWorker
 // body
end

LoadError: Unable to autoload constant Sample::FetchStudentReportWorker, expected /home/ubuntu/my-app/app/workers/sample/fetch_student_report_worker.rb to define it

share|improve this question

edited Apr 8 at 14:01

mohammad RaoofNia

24811 silver badge1111 bronze badges

asked Mar 28 at 12:19

GaletGalet

1,46577 gold badges4242 silver badges9191 bronze badges

share|improve this question

edited Apr 8 at 14:01

mohammad RaoofNia

24811 silver badge1111 bronze badges

asked Mar 28 at 12:19

GaletGalet

1,46577 gold badges4242 silver badges9191 bronze badges

edited Apr 8 at 14:01

mohammad RaoofNia

24811 silver badge1111 bronze badges

edited Apr 8 at 14:01

mohammad RaoofNia

24811 silver badge1111 bronze badges

asked Mar 28 at 12:19

GaletGalet

1,46577 gold badges4242 silver badges9191 bronze badges

asked Mar 28 at 12:19

GaletGalet

1,46577 gold badges4242 silver badges9191 bronze badges

2 Answers
2

active

oldest

votes

1

I think this might be the file name is spelt incorrectly. make sure your file is exactly 'fetch_student_report_worker.rb' and the file path is correct.

share|improve this answer

answered Apr 1 at 13:22

BradBrad

3,27533 gold badges1616 silver badges3232 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  When I run single worker, it ran successfully. So I don't believe it a filename error. I get error when I run all workers at the same time.
  
  – Galet
  Apr 2 at 4:32
  

  
  
  
  

add a comment
 | 

1

You can see autoload_paths to type this command.

bin/rails r 'puts ActiveSupport::Dependencies.autoload_paths'

If you can't see .../app/workers/sample, add the autoload_paths in config/application.rb

config.autoload_paths << Rails.root.join("app/workers/sample")

If it could causes problem in production mode, use the 'eager_load_paths'

referece from https://guides.rubyonrails.org/autoloading_and_reloading_constants.html

share|improve this answer

answered Apr 1 at 13:49

ogelacinycogelacinyc

69966 silver badges2020 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  since the error says: "expected /home/ubuntu/my-app/app/workers/sample/fetch_student_report_worker.rb to define it" would that not imply it already is in the autoload path, but it can't find it there, hence my concern that the filename is incorrect.
  
  – Brad
  Apr 1 at 13:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  ./app/workers is present in autoload paths
  
  – Galet
  Apr 2 at 4:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Galet can you show me a part of code when loads the constant Sample::FetchStudentReportWorker?
  
  – ogelacinyc
  Apr 2 at 5:50
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Brad I am calling the workers in rails console as below at the same time. Sample::FetchBookReportWorker.perform_async Sample::FetchStudentReportWorker.perform_async Sample::FetchTeacherReportWorker.perform_async Sample::FetchCollegeReportWorker.perform_async
  
  – Galet
  Apr 2 at 6:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  maybe spring is problem. $ bin/spring stop and rails console then run again. In sidekiq wiki, "NOTE: If you are testing this out in Rails console and you use spring you may need to stop spring so that you can access the new worker."
  
  – ogelacinyc
  Apr 2 at 6:17
  

  
  
  
  

 | 
show 1 more comment

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1

I think this might be the file name is spelt incorrectly. make sure your file is exactly 'fetch_student_report_worker.rb' and the file path is correct.

share|improve this answer

answered Apr 1 at 13:22

BradBrad

3,27533 gold badges1616 silver badges3232 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  When I run single worker, it ran successfully. So I don't believe it a filename error. I get error when I run all workers at the same time.
  
  – Galet
  Apr 2 at 4:32
  

  
  
  
  

add a comment
 | 

1

I think this might be the file name is spelt incorrectly. make sure your file is exactly 'fetch_student_report_worker.rb' and the file path is correct.

share|improve this answer

answered Apr 1 at 13:22

BradBrad

3,27533 gold badges1616 silver badges3232 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  When I run single worker, it ran successfully. So I don't believe it a filename error. I get error when I run all workers at the same time.
  
  – Galet
  Apr 2 at 4:32
  

  
  
  
  

add a comment
 | 

I think this might be the file name is spelt incorrectly. make sure your file is exactly 'fetch_student_report_worker.rb' and the file path is correct.

share|improve this answer

answered Apr 1 at 13:22

BradBrad

3,27533 gold badges1616 silver badges3232 bronze badges

share|improve this answer

answered Apr 1 at 13:22

BradBrad

3,27533 gold badges1616 silver badges3232 bronze badges

answered Apr 1 at 13:22

BradBrad

3,27533 gold badges1616 silver badges3232 bronze badges

answered Apr 1 at 13:22

BradBrad

3,27533 gold badges1616 silver badges3232 bronze badges

1

You can see autoload_paths to type this command.

bin/rails r 'puts ActiveSupport::Dependencies.autoload_paths'

If you can't see .../app/workers/sample, add the autoload_paths in config/application.rb

config.autoload_paths << Rails.root.join("app/workers/sample")

If it could causes problem in production mode, use the 'eager_load_paths'

referece from https://guides.rubyonrails.org/autoloading_and_reloading_constants.html

share|improve this answer

answered Apr 1 at 13:49

ogelacinycogelacinyc

69966 silver badges2020 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  since the error says: "expected /home/ubuntu/my-app/app/workers/sample/fetch_student_report_worker.rb to define it" would that not imply it already is in the autoload path, but it can't find it there, hence my concern that the filename is incorrect.
  
  – Brad
  Apr 1 at 13:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  ./app/workers is present in autoload paths
  
  – Galet
  Apr 2 at 4:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Galet can you show me a part of code when loads the constant Sample::FetchStudentReportWorker?
  
  – ogelacinyc
  Apr 2 at 5:50
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Brad I am calling the workers in rails console as below at the same time. Sample::FetchBookReportWorker.perform_async Sample::FetchStudentReportWorker.perform_async Sample::FetchTeacherReportWorker.perform_async Sample::FetchCollegeReportWorker.perform_async
  
  – Galet
  Apr 2 at 6:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  maybe spring is problem. $ bin/spring stop and rails console then run again. In sidekiq wiki, "NOTE: If you are testing this out in Rails console and you use spring you may need to stop spring so that you can access the new worker."
  
  – ogelacinyc
  Apr 2 at 6:17
  

  
  
  
  

 | 
show 1 more comment

1

You can see autoload_paths to type this command.

bin/rails r 'puts ActiveSupport::Dependencies.autoload_paths'

If you can't see .../app/workers/sample, add the autoload_paths in config/application.rb

config.autoload_paths << Rails.root.join("app/workers/sample")

If it could causes problem in production mode, use the 'eager_load_paths'

referece from https://guides.rubyonrails.org/autoloading_and_reloading_constants.html

share|improve this answer

answered Apr 1 at 13:49

ogelacinycogelacinyc

69966 silver badges2020 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  since the error says: "expected /home/ubuntu/my-app/app/workers/sample/fetch_student_report_worker.rb to define it" would that not imply it already is in the autoload path, but it can't find it there, hence my concern that the filename is incorrect.
  
  – Brad
  Apr 1 at 13:52
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  ./app/workers is present in autoload paths
  
  – Galet
  Apr 2 at 4:31
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Galet can you show me a part of code when loads the constant Sample::FetchStudentReportWorker?
  
  – ogelacinyc
  Apr 2 at 5:50
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Brad I am calling the workers in rails console as below at the same time. Sample::FetchBookReportWorker.perform_async Sample::FetchStudentReportWorker.perform_async Sample::FetchTeacherReportWorker.perform_async Sample::FetchCollegeReportWorker.perform_async
  
  – Galet
  Apr 2 at 6:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  maybe spring is problem. $ bin/spring stop and rails console then run again. In sidekiq wiki, "NOTE: If you are testing this out in Rails console and you use spring you may need to stop spring so that you can access the new worker."
  
  – ogelacinyc
  Apr 2 at 6:17
  

  
  
  
  

 | 
show 1 more comment

You can see autoload_paths to type this command.

bin/rails r 'puts ActiveSupport::Dependencies.autoload_paths'

If you can't see .../app/workers/sample, add the autoload_paths in config/application.rb

config.autoload_paths << Rails.root.join("app/workers/sample")

If it could causes problem in production mode, use the 'eager_load_paths'

referece from https://guides.rubyonrails.org/autoloading_and_reloading_constants.html

share|improve this answer

answered Apr 1 at 13:49

ogelacinycogelacinyc

69966 silver badges2020 bronze badges

bin/rails r 'puts ActiveSupport::Dependencies.autoload_paths'

config.autoload_paths << Rails.root.join("app/workers/sample")

share|improve this answer

answered Apr 1 at 13:49

ogelacinycogelacinyc

69966 silver badges2020 bronze badges

answered Apr 1 at 13:49

ogelacinycogelacinyc

69966 silver badges2020 bronze badges

answered Apr 1 at 13:49

ogelacinycogelacinyc

69966 silver badges2020 bronze badges