yiisoft/yii2 — pull request #802 by cebe (2013-08-23 17:27:10+00:00)
Title: Allow specifying related data in a gridview data column

DataColumn uses ArrayHelper::getValue() which is now able to get related
data via `relation.attribute` syntax.

This feature was available in yii 1.1. and should also be in 2.0 imo

TODO:

- [ ] Documentation