How can I run rails console in Heroku? Rails 5.1 and postgresql

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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:in load_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:in try_require' from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.3/lib/rack/handler.rb:16:in get' from /app/vendor/bundle/ruby/2.4.0/gems/rack-2.0.3/lib/rack/server.rb:301:in server' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands/server/server_command.rb:68:in print_boot_information' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands/server/server_command.rb:38:in start' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands/server/server_command.rb:131:in block in perform' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands/server/server_command.rb:126:in tap' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands/server/server_command.rb:126:in perform' from /app/vendor/bundle/ruby/2.4.0/gems/thor-0.20.0/lib/thor/command.rb:27:in run' from /app/vendor/bundle/ruby/2.4.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in invoke_command' from /app/vendor/bundle/ruby/2.4.0/gems/thor-0.20.0/lib/thor.rb:387:in dispatch' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/command/base.rb:63:in perform' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/command.rb:44:in invoke' from /app/vendor/bundle/ruby/2.4.0/gems/railties-5.1.3/lib/rails/commands.rb:16:in ' from bin/rails:9:in require' 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.

rails-console heroku postgresql ruby-on-rails
2 Answers

You can specify the name of the app in case you have several:

heroku run rails c -a APP_NAME
user_40856360

My understanding is that the heroku run command is provided by the Heroku Command Line Interface (CLI). The CLI doesn't know how to handle the rails c command. However, running heroku run bash will spin up a new dyno and provides access to a Unix shell, where you can run commands (i.e. rails c) much like you're local terminal. For more info see: https://devcenter.heroku.com/articles/how-heroku-works.

Edited to fix mistake: the CLI does know how to handle the rails c command

user_60907360
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