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Description of problem:
Below API endpoint-

/katello/api/v2/organizations/1/content_views?search=label=<cv_label> 

should return the results based on the matched content view label.

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
$ curl -k -u admin:ranjan -X GET 'https://<satellite-fqdn>/katello/api/v2/organizations/<org-id>/content_views?search=label=<label-name>' -H 'content-type: application/json'

webUI also does not provide 'label' as a searchable attribute.
Actual results:
API call shows the below error-

{"displayMessage":"undefined method `composite?' for 27:Fixnum","errors":["undefined method `composite?' for 27:Fixnum"]}

Expected results:

content view search should match the provided label and results the matched content views

Additional info:

Moving this bug to POST for triage into Satellite 6 since the upstream issue http://projects.theforeman.org/issues/20844 has been resolved.

Verified with satellite 6.4 snap 13.

Used reproducer from OP, there was no traceback and the search was done as it was expected. 

Unfortunately, in hammer searching by label is still missing, in hammer you can search content view only by name or id. E.c Organization is searchable also by label .

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/RHSA-2018:2927