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Bundles

Using Drupal's Entity Definition Update Manager to add bundle support to an existing content entity

On a client project we were using a custom Drupal content entity to model some lightweight reusable content.

The content entity was originally single use and did not support bundles (e.g. node entities have node-type bundles).

As the project evolved, we needed to add bundle support for the custom entity-type, despite it already being in production use.

Read on to find out how we achieved this.