We just upgraded to 1.8 and now we cant create new hosts anymore. We dont use provisioning via foreman, i.e. 'unattended:false'.

Running on RHEL7.1

Full trace from UI:
NoMethodError
undefined method `compute?' for #<Host::Managed:0x007f22c5b44760>
app/models/nic/base.rb:23:in `block in '
app/models/concerns/orchestration.rb:48:in `valid?'
app/models/concerns/foreman/sti.rb:29:in `save_with_type'
app/controllers/hosts_controller.rb:84:in `create'
app/controllers/concerns/application_shared.rb:13:in `set_timezone'
app/models/concerns/foreman/thread_session.rb:32:in `clear_thread'
lib/middleware/catch_json_parse_errors.rb:9:in `call'

production.log:
Started POST "/hosts" for 10.66.1.251 at 2015-05-13 06:13:27 +0000
2015-05-13 06:13:27 [I] Processing by HostsController#create as */*
2015-05-13 06:13:27 [I] Parameters: {"utf8"=>"✓", "authenticity_token"=>"nhj7yLLha8nE1r7r4n3MNqHqHdgBdrWZkfa93IPrRdg=", "host"=>{"name"=>"bafa", "hostgroup_id"=>"4", "environment_id"=>"1", "puppet_proxy_id"=>"1", "puppetclass_ids"=>[""], "managed"=>"true", "progress_report_id"=>"[FILTERED]", "type"=>"Host::Managed", "is_owned_by"=>"2-Users", "enabled"=>"1", "model_id"=>"", "comment"=>"", "overwrite"=>"false"}}
2015-05-13 06:13:27 [W] Operation FAILED: undefined method `compute?' for #<Host::Managed:0x0000000820b1d0>
2015-05-13 06:13:27 [I] Rendered common/500.html.erb (5.4ms)
2015-05-13 06:13:27 [I] Completed 500 Internal Server Error in 49ms (Views: 9.7ms | ActiveRecord: 7.2ms)
2015-05-13 06:13:29 [I]