our hostgroups have compute profiles, subnets & operating system details configured.

so basically all needed to create a host via command line is this:

hammer host create --hostgroup-id ${GROUP} --build true --name ${HOST} --compute-resource-id 1

when trying to switch to hostgroup-title like this:

hammer host create --hostgroup-title ${GROUP} --build true --name ${HOST} --compute-resource-id 1

hammer now complains with this:

Could not create the host:
Error: At least one of options --architecture, --architecture-id is required

See: 'hammer host create --help'

it seems like when switch to houstgroup-title, hammer or foreman is not able to figure out the OS details configured with the hostgroup