The Great Pretender: Making your data act like a field

These days, almost every major Drupal site is using CCK, the module that lets you add custom fields to any content type. Among other things, CCK lets administrators rearrange a node type's contents using a simple drag and drop interface. In the past, this only worked for fields that CCK itself managed. If you worked with a custom module that altered a node's content, it was up to you to manage its position in the node content.

Now, though, it's possible for any module to tie into CCK's field management page to control the positioning of custom content. The key is hook_content_extra_fields(), and in this article we'll show you how to use it.

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