Observers will be no more as of Rails 4, farewell, never been much of a 
fan. However, I'm using it in one of my gems which enables model attributes 
for use with a WYSIWYM editor. The resulting markup is persisted, but in 
order to use it in a view, it has to be nokogiried in a helper which 
fragment caches the result. This cache has to be zapped once the model 
instance is either updated or destroyed. An observer for after_update and 
after_destroy seemed the obvious choice at that time.

What would be a Rails 4 approach for this without observers? Inject 
after_update and after_destroy callbacks directly into the model?

-sven 

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