If you're still working on ruby 1.8, you should know that using SimpleDelegator is often prohibitively slow. I have seen SimpleDelegator.new(myActiveRecordModel) take 50ms+ per instantiation.
The reason is that SimpleDelegator actually loops through all methods of an object and does a define_method. Which is not exactly fast.
To speed up your code, you can often simply replace
class MyUserDecorator < SimpleDelegator
...
end
with
class MyUserDecorator < DelegateClass(User)
...
end
This will obviously not work if you pass in anything else than a user object, and hence you can no longer easily chain delegators.
Posted by Tobias Kraze to makandra dev (2013-12-04 17:10)