# make sure site has a ControllerSite record for each controller
ctrl_sites = ControllerSite.objects.filter(site=site)
existing_controllers = [cs.controller for cs in ctrl_sites]
# make sure site has a ControllerSite record for each controller
ctrl_sites = ControllerSite.objects.filter(site=site)
existing_controllers = [cs.controller for cs in ctrl_sites]