Heroku部署Ruby on Rails应用/users路由报错排查请求

Hey there! Let's break down why your /users page is showing that generic "something went wrong" error on Heroku, even when it works perfectly locally. Here are the most likely fixes to try, in order of how common they are:

1. You Haven't Run Database Migrations on Heroku #

This is the #1 culprit for new Rails deployments to Heroku. When you run rails db:migrate locally, you're setting up your development database—but Heroku uses a separate production Postgres database that doesn't get migrated automatically.

To fix this, open your terminal and run:

heroku run rails db:migrate

Once that finishes, refresh the /users page on Heroku. Chances are, this will resolve the issue since the Toy App's /users route depends on the users database table that migrations create.

2. Pull Heroku Logs to See the Exact Error #

The generic error page doesn't tell you anything useful—you need to look at the actual error stack trace. Run this command to stream real-time logs from your Heroku app:

heroku logs --tail

Then, in your browser, try visiting the /users page again. Your terminal will spit out the precise error (like "relation 'users' does not exist" or a routing issue). This is the fastest way to pinpoint exactly what's broken if the migration fix doesn't work.

3. Check Production Environment Configurations #

Rails behaves differently in production (Heroku's default environment) than it does in your local development environment. A couple quick checks here:

• Open config/environments/production.rb and make sure config.assets.compile is set to true (this is a common gotcha for static assets, though it's more likely to break the homepage—but it's worth a quick check). If you change it, commit the change and redeploy to Heroku.
• Verify that your config/database.yml doesn't have any custom production settings that conflict with Heroku's auto-configured DATABASE_URL environment variable. The default Rails setup from the tutorial should work fine here, but it's worth a glance.

4. Confirm Your Code is Fully Synced to BitBucket #

Even though your build logs look normal, double-check that all your local code (especially app/controllers/users_controller.rb and config/routes.rb) is pushed to your BitBucket repo. If, for example, you forgot to push the route for resources :users, Heroku wouldn't know about the /users path—but since this works locally, this is less likely. Still, a quick git status check never hurts!

Start with the database migration first—it's the most common fix for this exact scenario. If that doesn't work, the logs will give you the exact clue you need to dig deeper.

内容的提问来源于stack exchange，提问作者Marium