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I've been following along with a tutorial for a Rails app. The tutorial is based on Rails 5 and I am using Rails 5.1.2. Everything works great locally and pushed to heroku with no problems. However, when I went to create an admin user on the production database by running:
$ heroku run rails c
it returns the following error:
/app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.3/lib/active_support/dependencies.rb:292:in
require': cannot load such file -- rack/handler/c (LoadError) from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.3/lib/active_support/dependencies.rb:292:inblock in require' from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.3/lib/active_support/dependencies.rb:258:inload_dependency' from /app/vendor/bundle/ruby/2.4.0/gems/activesupport-5.1.3/lib/active_support/dependencies.rb:292:inrequire' from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.3/lib/rack/handler.rb:74:intry_require' from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.3/lib/rack/handler.rb:16:inget' from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.3/lib/rack/server.rb:301:inserver' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands/server/server_command.rb:68:inprint_boot_information' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands/server/server_command.rb:38:instart' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands/server/server_command.rb:131:inblock in perform' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands/server/server_command.rb:126:intap' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands/server/server_command.rb:126:inperform' from /app/vendor/bundle/ruby/2.4.0/gems/thor-0.20.0/lib/thor/command.rb:27:inrun' from /app/vendor/bundle/ruby/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:ininvoke_command' from /app/vendor/bundle/ruby/2.4.0/gems/thor-0.20.0/lib/thor.rb:387:indispatch' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/command/base.rb:63:inperform' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/command.rb:44:ininvoke' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands.rb:16:in' from bin/rails:9:inrequire' from bin/rails:9:in'`
To get around this I can run:
$ heroku run bash
$ rails c
and this allows me to update the production database. While this works and gets me what I need. I want to know why the original command doesn't work. I have searched everywhere for an answer and can't come up with anything that applies to me. I am trying to improve my developing skills and would like to understand why the original problem won't work.
I can add any files anyone needs to see, but I don't even know which ones would be relevant to this problem.
781
So, the reason why you cannot use SQLite on Heroku is because SQLite stores all database information in a file on disk, and because Heroku will delete the files on your disk, this won't work.
Go to your browser and open http://localhost:3000, you will see a basic Rails app running. You can also use the alias "s" to start the server: bin/rails s . The server can be run on a different port using the -p option. The default development environment can be changed using -e .
Ruby on Rails is a popular web framework written in Ruby. This guide covers using Rails 7 on Heroku. For information on running previous versions of Rails on Heroku, see the tutorial for Rails 6. x or Rails 5.
You can specify the name of the app in case you have several:
heroku run rails c -a APP_NAME
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