Created attachment 1294487 [details]
on deleting host from UI raises error

Description of problem:
I was trying to remove a host from UI, which was provisioned on libvirt CR. UI raises error:

Error: failed to destroy the record.

following exception raised in production.log

2017-07-05 04:00:54 9f30a3c9 [app] [I] Started DELETE "/hosts/testhost1.idmqe.lab.eng.bos.redhat.com" for 10.67.116.71 at 2017-07-05 04:00:54 -0400
2017-07-05 04:00:54 9f30a3c9 [app] [I] Processing by HostsController#destroy as HTML
2017-07-05 04:00:54 9f30a3c9 [app] [I]   Parameters: {"authenticity_token"=>"oioiSHJHDexlU0ZMvKtP2sBNrU2AnZJuk1ofM5Fa96yQAfeguDOJwog9BwPd0t/qnhk+NtBUfG1YAMZlsi26pQ==", "id"=>"testhost1.idmqe.lab.eng.bos.redhat.com"}
2017-07-05 04:00:54 9f30a3c9 [app] [I] Current user: admin (administrator)
2017-07-05 04:00:54 9f30a3c9 [app] [I] Current user: foreman_admin (administrator)
2017-07-05 04:00:55 9f30a3c9 [app] [I] Current user: admin (administrator)
2017-07-05 04:00:55 9f30a3c9 [app] [I] Current user: foreman_admin (administrator)
2017-07-05 04:00:55 9f30a3c9 [app] [I] Current user: admin (administrator)
2017-07-05 04:00:55 9f30a3c9 [app] [I] Delete the DNS A record for testhost1.idmqe.lab.eng.bos.redhat.com/192.168.100.5
2017-07-05 04:00:55 9f30a3c9 [app] [I] Delete the DNS PTR record for 192.168.100.5/testhost1.idmqe.lab.eng.bos.redhat.com
2017-07-05 04:00:56 9f30a3c9 [app] [I] Delete DHCP reservation testhost1.idmqe.lab.eng.bos.redhat.com for testhost1.idmqe.lab.eng.bos.redhat.com-52:54:00:3e:5e:82/192.168.100.5
2017-07-05 04:00:56 9f30a3c9 [app] [W] Failed to parse response: null -> 784: unexpected token at 'null'
2017-07-05 04:00:56 9f30a3c9 [app] [I] Add DNS PTR record for 192.168.100.5/testhost1.idmqe.lab.eng.bos.redhat.com
2017-07-05 04:00:56 9f30a3c9 [app] [I] Add DNS A record for testhost1.idmqe.lab.eng.bos.redhat.com/192.168.100.5
2017-07-05 04:00:56 9f30a3c9 [foreman-tasks/action] [E] Failed to destroy the record (ActiveRecord::RecordNotDestroyed)
 | /opt/rh/rh-ror42/root/usr/share/gems/gems/activerecord-4.2.6/lib/active_record/persistence.rb:185:in `destroy!'
 | /opt/rh/rh-ror42/root/usr/share/gems/gems/activerecord-4.2.6/lib/active_record/associations/has_many_association.rb:171:in `each'
 | /opt/rh/rh-ror42/root/usr/share/gems/gems/activerecord-4.2.6/lib/active_record/associations/has_many_association.rb:171:in `delete_records'
 | /opt/rh/rh-ror42/root/usr/share/gems/gems/activerecord-4.2.6/lib/active_record/associations/collection_association.rb:525:in `remove_records'
 | /opt/rh/rh-ror42/root/usr/share/gems/gems/activerecord-4.2.6/lib/active_record/associations/collection_association.rb:518:in `block in delete_or_destroy'
 | /opt/rh/rh-ror42/root/usr/share/gems/gems/activerecord-4.2.6/lib/active_record/associations/collection_association.rb:183:in `block in transaction'
 | /opt/rh/rh-ror42/root/usr/share/gems/gems/activerecord-4.2.6/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `transaction'
 | /opt/rh/rh-ror42/root/usr/share/gems/gems/activerecord-4.2.6/lib/active_record/transactions.rb:220:in `transaction'
 | /opt/rh/rh-ror42/root/usr/share/gems/gems/activerecord-4.2.6/lib/active_record/associations/collection_association.rb:182:in `transaction'
 | /opt/rh/rh-ror42/root/usr/share


Please note that above error appears only first time. second time when I re-tried to remove host, it was deleted successfully.


Version-Release number of selected component (if applicable):
sat6.3 snap4

How reproducible:


Steps to Reproduce:
1. create a host 
2. delete it ( first time error appears Fail to destroy record)
3.

Actual results:


Expected results:
Host should be deleted cleanly first time.

Additional info: