Querying events by "generated" fails due to lookup in traits

[Christian Brinker]

When trying to query something like /v2/events?q.field=generated&q.op=gt&q.value=2015-10-27T00:00.0, ceilometer tries to lookup for events with trait "generated" instead of the field "generated".

[gordon chung (chungg)]

the current use case is to query against start_timestamp or end_timestamp. i'm ok with adding support for using generated keyword. that said, this might be a gap in documentation as well.

https://github.com/openstack/ceilometer/blob/master/ceilometer/api/controllers/v2/events.py#L179-L180

[heha (zhanghanqun)]

@chungg
If we adding support for generated keyword, it can ony be used with "op=eq".
Because if we use the 'eq' for field.
https://github.com/openstack/ceilometer/blob/master/ceilometer/api/controllers/v2/events.py#L195

[OpenStack Infra (hudson-openstack)]

Change abandoned by zhanghanqun (<email address hidden>) on branch: master
Review: https://review.openstack.org/244606
Reason: recode