How to enable and disable sort in Yii2 GridView?

Yii 2.0 General Discussions
1

How to enable and disable sort in Yii2 GridView ?

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2

In Yii 1 sort for attributes from related models was disabled by default. I think it will be the same for Yii 2.

However this tutorial explains how to sort attributes from related models

http://www.yiiframework.com/wiki/281/searching-and-sorting-by-related-model-in-cgridview/