How to model a user that can be a host, customer, or both? Rails

Question

I am trying to rebuild something like airbnb as a side project and I'm wondering how to model a User entity that can be either a Host , a Customer , or both. How would one represent this?

The issue with polymorphism is that the User can only either a Host or a Customer but not both.

Is the best way to do this via two has-one relationships?

Answer 1

The way I would approach this problem is by having three models: User , Rental ,(home to rent), and RentalBooking (the booking a user makes)

A User has many Rental 's, and the Rental "host" would be determined by whoever owns the Rental (The rentals user_id). The RentalBooking would have a rental_id and a user_id (User ID being the customer).

Personally, I wouldn't necessary have a give the user a role of Host or Customer , but this information would easily be presentable in each booking or rental post.