Checking permissions on decorator in view

[janpeterka]

I know this has been opened multiple times here (#255 , #327), but as that is old, and around Draper, I though I might open new discussion here.

I use decorated objects in my views, such as class EventDecorator < SimpleDelegator

And in view, I need to check whether to show button with action (edit, delete,..) via can?.
However, that doesn't work, as I my Abilities I define it for Event.

Now, I could change all my rules to [Event, EventDecorator], but it goes against duck typing in my opinion - in my views I approach my decorated object same as the original.

I tried to force my EventDecorator to behave like Event for cancancan, but I didn't manage it.

Is there a way to do this in duck-typed manner?