Mastering Rails and Ruby: A Collection of Practical Tips for Cleaner Code

The N+1 query problem, where associated records trigger multiple queries, is solved using `includes` for efficient data loading. `pluck` efficiently retrieves specific columns, avoiding unnecessary data retrieval. Rails' range syntax simplifies date filtering, and `present?` enhances readability by avoiding double negations. `exists?` optimizes queries by checking for record existence without loading the full record. `with_options` groups common validations for improved code organization and maintainability. `pluck` also works with Ruby hashes, providing a concise way to extract specific keys. The `has_one` association efficiently caches calculated associations, preventing repeated queries. These techniques collectively improve Rails application performance and code clarity. By employing these strategies, developers can write more efficient and maintainable Rails applications.