Common Hanami Issues and Solutions

1. Routing Errors

Routes do not work as expected, leading to 404 errors or incorrect controller actions being called.

Root Causes:

• Incorrect route definitions in config/routes.rb.
• Misspelled controller or action names.
• Namespace conflicts causing unexpected route behavior.

Solution:

Check the defined routes:

bundle exec hanami routes

Ensure routes are correctly mapped to actions:

get "/users", to: "users#index"

Restart the Hanami server to apply changes:

bundle exec hanami server

2. Database Connection Issues

Hanami fails to connect to the database, preventing application functionality.

Root Causes:

• Incorrect database configuration in config/environment.rb.
• Database server is not running.
• Missing database migrations.

Solution:

Verify database configuration:

DB_URL="postgres://user:password@localhost/db_name"

Ensure the database service is running:

sudo systemctl start postgresql

Run migrations to apply schema changes:

bundle exec hanami db migrate

3. Dependency Conflicts

Hanami applications may fail due to incompatible gem versions.

Root Causes:

• Conflicting dependencies in Gemfile.lock.
• Incompatible versions of Ruby or Bundler.
• Obsolete or deprecated gems in use.

Solution:

Update dependencies to resolve conflicts:

bundle update

Check for outdated gems:

bundle outdated

Ensure the correct Ruby version is being used:

ruby -v

4. View Rendering Failures

Views do not render properly or return unexpected errors.

Root Causes:

• Incorrect template file names.
• Missing or incorrectly defined view methods.
• Issues with layout inheritance.

Solution:

Ensure template files follow the correct naming conventions:

apps/web/templates/home/index.html.erb

Check if the corresponding view method is defined:

module Web::Views::Home
  class Index
    include Web::View
  end
end

Specify layouts correctly in views:

layout :application

5. Configuration Problems

Incorrect Hanami configurations lead to unexpected behavior or deployment failures.

Root Causes:

• Environment variables not set correctly.
• Incorrect application settings in config/environment.rb.
• Misconfigured logging and error handling.

Solution:

Ensure environment variables are set:

export HANAMI_ENV=production

Check application settings:

bundle exec hanami environment

Enable detailed logging for debugging:

HANAMI_LOG_LEVEL=debug bundle exec hanami server

Best Practices for Hanami Optimization

• Regularly check routes using hanami routes to ensure correct mappings.
• Use version constraints in Gemfile to avoid dependency conflicts.
• Keep database migrations in sync to prevent schema issues.
• Follow Hanami naming conventions to avoid rendering problems.
• Monitor logs for debugging and troubleshooting unexpected errors.

Conclusion

By troubleshooting routing errors, database connection issues, dependency conflicts, rendering failures, and configuration problems, developers can ensure a smooth development experience with Hanami. Implementing best practices enhances the stability and performance of Hanami applications.

FAQs

1. Why is my Hanami route not working?

Check the routes using hanami routes, ensure correct mappings, and restart the server.

2. How do I fix database connection errors in Hanami?

Verify database configuration, ensure the service is running, and run necessary migrations.

3. How can I resolve dependency conflicts in Hanami?

Update gems using bundle update, check outdated dependencies, and verify the Ruby version.

4. Why are my views not rendering correctly?

Ensure template file names are correct, define necessary view methods, and verify layout inheritance.

5. How do I configure Hanami for production?

Set the appropriate environment variables, check configuration files, and enable logging for monitoring.