Content types often begin as collections of fields, but as projects grow, those types accumulate rules, exceptions, and special cases that are scattered across services, hooks, and event subscribers. Over time, this makes sites harder to change and harder to reason about.
This session introduces entity bundle classes as a practical way to give content types real behavior. Bundle classes allow content types to answer questions about themselves, shifting logic out of conditionals and into well-defined methods. This approach helps teams move from field-based thinking to behavior-based modeling, letting Drupal understand what content means instead of just how it is structured.
Attendees will see how bundle classes provide an approachable introduction to object-oriented design concepts such as interfaces and polymorphism, without requiring deep OOP experience. Through real-world examples, we will refactor common Drupal patterns to program to interfaces rather than hardcoded rules, reducing duplication and improving long-term maintainability.
This talk is designed for Drupal developers, site builders, and technical decision makers at all levels who want to write clearer code, scale their sites more confidently, and help their content types grow up in a sustainable way.
