Where to put shared non-model logic?

@davegoulash wrote:

My app can be user configured to use different "rules". Models should use these rules to do calculations.

Something like:

rules  = Rules.create({config: {}});
rules.calculateWinner(instanceOfClassA);
rules.calculateStats(instanceOfClassB);

Where should I place the Rules class? Should it be a service?

I could move the calculateSomething() methods to the models and feed it the Rules instance as a param, but I don't want to create huge models.

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