With Drupal 7 the entity system was introduced. The entity system is a unifying API for all sorts of Drupal objects like Users, Nodes, Comments, Files, etc. If you want to create fields that link to those entities, you can use the Entity Reference module.
In this tutorial you will learn:
- How the Entity Reference Drupal module works and how it can be applied to a number of use cases
- How the Entity Reference Drupal module can be used to relate two different types of Drupal nodes
- How the Entity Reference Drupal module can be used to relate a Drupal user to a Drupal node
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