Badly added title to employees model, view, and controller with destroy scafford_controller Employee - generate model AddTitleToEmployee - generate scaffold_controller Employee. This added title to the table but rake wouldn't work. Somehow I'd added title already. So I removed the Add migration file and just added title to the Create migration file. Then I hand altered the Views and Controllers. I think I fixed it all and got it the way I wanted, but that really sucked.
On Employee input form, changed default_office_id input to collection_select of Offices.
Created scopes by office_id on the employees table. (plus a minor edit in views/employees/_form_html.erb)
Added office_directories controller and associated index action and viewfor displaying a list of Employees by each office. Set up custom route and root route to point to this new controller and action.