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Using ORMs and DTOs Elegantly

There has been a lot of backlash against Data Transfer structures and using Data Mapping libraries in recent years. Many have argued that neither of these have any place in a modern, elegantly-designed application. Having worked extensively with many different approaches of external data intergrations, I find that it is rather easy to use these tools correctly, while avoiding many of the downsides. I will show you how to use ORMs and DTOs elegantly.

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Indirection Is Not Abstraction

The concept of abstraction in software development is frequently misunderstood and confused with indirection. This is partially because of the keywords abstract and interface in statically-typed languages such as Java and C#. The confusion often leads to design changes that leave the code worse than before it was touched. Let’s look at how abstraction and indirection relate, and how to correctly connect components.

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Elegant A/B Tests

Flexible software systems are a pleasure to modify. You know that you have a flexible system when you can change the behavior of the system without changing any existing code. Adding a new behavior should simply require adding new code. I will show you how to easily introduce A/B tests along with a new feature, without changing the existing code.

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Test Failures Are Critical Bugs

In a mature software project, tests are what enable risk-free, rapid development. They are the only thing that truly enables Continuous Integration and Continuous Delivery for software that is deployed directly to end users. In order to keep delivering, those tests must be kept pristine, and any failure represents a critical flaw which must be immediately addressed. Every test failure that happens outside of new feature development on a developer’s box, must result in a Bug Ticket. No exceptions!

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