In a layout I need to display number of notifications.
what is the right way of doing it? I'm thinking to create a widget for it but is accessing DB while rendering view correct?
YII widget access model - I need a value from DB in my layout
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Yes, it is ok to create a widget for this needs.
After done, it is ok to call it from layout.
You can even use caching in order not to bother DB too often.
http://www.yiiframework.com/wiki/17/how-to-make-use-of-a-fragment-cache/
Finally: I would recommend writing widget and using it with fragmental caching.