Book Image

Polished Ruby Programming

By : Jeremy Evans
5 (1)
Book Image

Polished Ruby Programming

5 (1)
By: Jeremy Evans

Overview of this book

Anyone striving to become an expert Ruby programmer needs to be able to write maintainable applications. Polished Ruby Programming will help you get better at designing scalable and robust Ruby programs, so that no matter how big the codebase grows, maintaining it will be a breeze. This book takes you on a journey through implementation approaches for many common programming situations, the trade-offs inherent in each approach, and why you may choose to use different approaches in different situations. You'll start by refreshing Ruby fundamentals, such as correctly using core classes, class and method design, variable usage, error handling, and code formatting. Then you'll move on to higher-level programming principles, such as library design, use of metaprogramming and domain-specific languages, and refactoring. Finally, you'll learn principles specific to web application development, such as how to choose a database and web framework, and how to use advanced security features. By the end of this Ruby programming book, you’ll be a well rounded web developer with a deep understanding of Ruby. While most code examples and principles discussed in the book apply to all Ruby versions, some examples and principles are specific to Ruby 3.0, the latest release at the time of publication.
Table of Contents (23 chapters)
Section 1: Fundamental Ruby Programming Principles
Section 2: Ruby Library Programming Principles
Section 3: Ruby Web Programming Principles

Treating the database as not just dumb storage

You should avoid treating your database as just a place to store and retrieve your data, as a good relational database offers so much more.

In general, retrieving rows from a database table, performing operations on each row, and saving the modified row back to the database is relatively slow. If it is possible, it is much faster to write a database function for performing the same operation, and issue a single UPDATE statement to update all rows at once. This is usually at least one order of magnitude faster, and sometimes multiple orders of magnitude faster.

Even in cases where you aren't updating data, you can use database operations to improve performance. For example, let's say you have a table with first names and last names, and you want to return a single string combining the first and last names. Do the concatenation in the database via a query such as this:

# SELECT first_name || ' ' || last_name...