ruby on rails - Defining methods on the activerecord relationship

I want to define a custom method on an activerecord relation, eg:


A simple example would be where summed_values should evaluate sum(:value) on the relation.

Where should I define the method summed_values? Looks like it should be on ActiveRecord::Relation. If it should be directly there, which file should I put it in?

Also, if this new method only has meaning for Transactions, is there any way to tell rails to only define this method for ActiveRecord::Relations that consist of Transactions?

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