Created attachment 1045214 [details]
Output of foreman-debug from a Satellite 6.1.0 system running RHEL 7.1.

Description of problem:
A content view filter rule may have the following attributes:

* content_view_filter_id
* end_date
* errata_id
* errata_ids
* max_version
* min_version
* name
* start_date
* types
* version

Only some of these attributes may be available, depending on the filter's type.
For example, an erratum content view filter rule has the following attributes:

* content_view_filter_id
* end_date
* errata_id
* errata_ids
* start_date
* types

A GET request to `/katello/api/v2/content_view_filters/:id/rules/:id` does not
return all of these attributes. For example, here are the attributes returned
for an errata content view filter rule:

* content_view_filter_id
* created_at
* errata_id
* id
* updated_at

The following attributes are missing from the server's response:

* end_date
* errata_ids
* start_date
* types

This is problematic for two reasons:

* The state of the content view filter rule is unclear. Are the un-mentioned
  attributes simply nil? Are they set but not returned by the API?
* The behaviour of the API is unclear. Will the same set of attributes be
  returned if I update the entity with new attributes?

Version-Release number of selected component (if applicable):
Satellite 6.1.0. Foreman-debug is attached.

How reproductible:
100%

Steps to reproduce:
1. Create a content view filter rule.
2. Get information about the content view filter rule by issuing an HTTP GET
   request to `/katello/api/v2/content_view_filters/:id/rules/:id`.
3. Inspect the returned JSON payload. Discover that numerous attributes are not
   mentioned.

Actual results:
See above.

Expected results:
See above.

Additional info.
n/a