Background: there are several places in our app where we want to display date-oriented information on a calendar. The event_calendar gem looks nice and has lots of reviews, so it's what I'm planning to use. However, it's designed to work with a model. I'm not going to update our existing models to meet its needs, so will create a DTO class and a helper function to construct an array of instances from our existing models.
My question is: where should that DTO class live? It seems like it should be defined inside
ViewHelper, but that will violate DRY as soon as I use the calendar for two models (note: the helper functions will differ, it's just the DTO class that will remain the same).
So, is there a standard place in the Rails directory tree where non-model-related classes live?
Or is there a better/more idiomatic way to do this? One thought that I had was to make my helper function decorate the existing model instances with the methods that event_calendar wants to see.