Upstream bug component is API - Content

Moving this bug to POST for triage into Satellite 6 since the upstream issue http://projects.theforeman.org/issues/15697 has been resolved.

Verified in Satellite 6.2.7 Snap 1

Querying the host, without modification returns
{
...
"content_source_id": null,
...
}

Submitting a PUT to the host path with a specific valid ID results in that id being saved/displayed in subsequent requests.
{
...
"content_source_id": null,
...
}

Submitting a PUT to the host path with an invalid ID results in the following error message.
{
  "error": {
    "message": "ERROR:  insert or update on table \"hosts\" violates foreign key constraint \"hosts_content_source_id_fk\"\nDETAIL:  Key (content_source_id)=(101) is not present in table \"smart_proxies\".\n"
  }
}

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:0197

covered for clones  https://bugzilla.redhat.com/show_bug.cgi?id=1488130
https://bugzilla.redhat.com/show_bug.cgi?id=1339613