---
description: This rule explains Ruby on Rails conventions and best practices for backend development.
globs: **/*.rb
alwaysApply: false
---
# Ruby on Rails rules
- Use Rails generators to create models, controllers, and migrations.
- Follow Rails naming conventions (singular for models, plural for controllers).
- Use ActiveRecord methods instead of raw SQL queries when possible.
- Avoid N+1 queries by using eager loading with `includes`, `preload`, or `eager_load`:
```ruby
# Good pattern
users = User.includes(:posts)
users.each { |user| puts user.posts.count }
```
- Use strong parameters in controllers for mass assignment protection:
```ruby
def user_params
params.require(:user).permit(:name, :email, :password)
end
```
- Use scopes for common query patterns and concerns to share code between models.
- Use service objects for complex business logic that doesn't belong in models or controllers.