API object to ActiveRecord model

I'm retrieving API objects using a gem (mondo-ruby specifically). How do I save these objects to a database and manipulate them in the same way as I would an ActiveRecord model? Say I have some model Article with fields ID, Creation Date, Updated Date (as generated by Rails), Title and Body. If I initialize one of these, it can be validated, then saved to the database. After that, I'm free to query the Article model to return any Articles I've saved. I want to be able to do the same with transactions with mondo-ruby, basically. How might I go about doing this?