How to load/associate with composite primary keys

[jdwyant8]

Hello,

I've seen that fizz handles compound keys, is there any examples of how gobuffalo eager loads through those keys?

For example, I have the following:
Coordinates (lat/lon/{id/order}) - {id/order} being the composite key
-(53.3, -119.6, 0, "aaa", 1)
-(54.3, -120.6, 0, "aaa", 2)
-(52.3, -119.6, 0, "aaa", 3)
-(43.3, -119.6, 0, "aab", 1)
-(42.3, -149.6, 0, "aab", 2)
-(24.3, -119.6, 0, "aab", 3)

Buildings (name/coordinates)
-("weirdly large building", "aaa")
-("freakishly large building", "aab")

I assume when creating coordinates, I have to make the first one and then manually copy the UUID to the subsequent ones, and manually place that ID into buildings?
How does "belongs_to" and "has_one" work with a composite primary key like this?
Will eager loading on buildings work in pulling the coordinates?