Hi I'm building a db schema which will have a number of Jobs which
belong to a Project.  A Job can cover many Rooms in different
Buildings.  Each Project can have many Buildings.  I have the
following associations.  With scaffolding it looks okay, but when i
add a job, how can i filter the room number list box so it only lists
the room numbers for the Project Buildings.  When i add a job, i
select the project, so i don't have a project.id to go on?  Any advice
would be appreciated.

One Project HABTM Building
One Building HABTM Project

One Job HABTM Room
One Room HABTM Job

One Project hasMany Job
One Building hasMany Room
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