When deploying a host on OpenStack with Neutron based networking, it's only possible to select networks. It would be nice to be able to specify a fixed IP as well.

fog-openstack has support for specifying a fixed address already: https://github.com/fog/fog-openstack/blob/master/lib/fog/openstack/compute/requests/create_server.rb#L50
It's not possible to use this feature right away because Foreman only expects the network ID and constructs the nic hash for fog itself https://github.com/theforeman/foreman/blob/develop/app/models/compute_resources/foreman/model/openstack.rb#L136

A simple backward-compatible change of the line 136 would allow user to post the whole nic hash to /api/hosts when deploying the host.

nics.map {|nic| nic.is_a?(String) ? { 'net_id' => nic } : nic }

I will create a pull request, filing this issue just to have the bug #.