module ActiveRecord::Reflection::ClassMethods

Account.reflect_on_aggregation(:balance) # returns the balance AggregateReflection

Returns the AggregateReflection object for the named +aggregation+ (use the symbol). Example:

def reflect_on_aggregation(aggregation)
  reflections[aggregation].is_a?(AggregateReflection) ? reflections[aggregation] : nil
end