I very searched about this issue in forum and didn’t find a suitable subject for it, there was only amount content scattered. The reason that i want to start a new thread.
Now,
Is there a plan for integrate an external ORM framework like Doctrine/Propel/… in Yii2 ?
Of course it does (see samdark’s answer above). It’s just that ONE core ORM is enough and Yii’s ActiveRecord implementation is/was one of the best parts of the framework. If you want to use something else (Doctrine, Eloquent etc.) you will have to add it on your own (with composer making this fairly straight forward I guess). You may have to use the Facade pattern though to allow a seemless integration into Yii (like configuring it through your app’s config file etc.) but this is a whole other story