Seeking good examples for Data Warehousing / Dimensional Modeling

Group:

Are there any good fully-spelled-out examples for Data Warehousing / Dimensional modeling in Rails? (An implementation of one of the chapters from Ralph Kimball's excellent "The Data Warehouse Toolkit would be ideal...)

I understand Dimensional Modeling. I understand just enough Rails, but not quite enough to write the migrations to establish foreign keys, one-to-many relationships, etc. It's a small hurdle, I know, but it's one that I haven't been able to scale. There must be others in the same boat.

(For now, I'm NOT interested in a pre-written package like ActiveWarehouse -- I'd like to understand what's going on under the hood, at least at first. Later, I will switch over if appropriate...)

TIA.