Bundles are an implementation of an entity type to which fields can be attached. In this lesson we’ll take a look at configuring a single bundle type for our entities in order to allow us to make them fieldable by hardcoding the bundle information into hook_entity_info(). This is the most basic implementation of bundles. Then we’ll look at adding the ability to attach fields to our newly created bundle.
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This video covers a topic in Drupal 7 which may or may not be the version you're using. We're keeping this tutorial online as a courtesy to users of Drupal 7, but we consider it archived.