This project enables list fields to populate their allowed values from a field on a referenced entity. For example, the Project issue tracking module reads the allowed values of the component list field on issue nodes from a field on a project (which can be found through an entityreference).
Note: this module requires Drupal core 7.14 or later, since it depends on the changes introduced at #1541792: Enable dynamic allowed list values function with additional context.
Here's an example of how to use it:
$field = array(
'cardinality' => '1',
'field_name' => 'field_issue_component',
'module' => 'list',
'settings' => array(
'allowed_values_function' => 'dereference_list_allowed_list_values',
'entityreference_field' => 'field_project',
'dereferenced_field' => 'field_project_components',
'type' => 'list_text',
This module was written by chx alone, don't blame bdragon for it.