association_observers
0.0.3
This is an alternative implementation of the observer pattern. As you may know, Ruby (and Rails/ActiveRecord) already have an implementation of it. This implementation is a variation of the pattern, so it is not supposed to supersede the existing implementations, but "complete" them for the specific use-cases addressed.
installgem install association_observers -v 0.0.3
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Gemfile
gem 'association_observers', '~> 0.0.3'
