[RFE]Support filter by attribute with null value

[Hongbin Lu]

Right now, it seems it is impossible to list resources with a filter that contains null value. For example, it is impossible to list subnets that doesn't have subnetpool. I tried the following, but it doesn't seem to work (it returned an empty list instead of the filtered list).

  GET "/subnets?subnetpool_id=null"

IMHO, we can consider to add support for that.

[Deepak Mourya (mourya007)]

hi, I Have tried this on the nova api as well and found similar results like

 curl -g -i -X GET http://172.30.64.26/compute/v2.1/servers/detail?key_name=null -H "Accept: application/json" -H "User-Agent: python-novaclient" -H "X-Auth-Token: gAAAAABbFRenwil3aQ485pkwoAKVRcGh9ijvLe4992_etOtrx0EXflUM_3NAgTigclsGC9ru7tEleHc-Ch0kYpTBUsEE1NJev5Hm9X2QrPRgLkWMbZebs6hFh6TMxK_rIwO0FobNQbRXcs_smCA8tc5KklNgxL7XCIoGYgvtTp1may6r7Q07dNE"
HTTP/1.1 200 OK
Date: Mon, 04 Jun 2018 10:43:19 GMT
Server: Apache/2.4.18 (Ubuntu)
Content-Length: 15
Content-Type: application/json
OpenStack-API-Version: compute 2.1
X-OpenStack-Nova-API-Version: 2.1
Vary: OpenStack-API-Version,X-OpenStack-Nova-API-Version
x-openstack-request-id: req-3337674d-d860-4788-aaa4-a3b049a8f045
x-compute-request-id: req-3337674d-d860-4788-aaa4-a3b049a8f045
Connection: close

{"servers": []}

So in my understanding this might be related with the rest api itself not specific to any openstack project. Please let me know your Opinion.

[Slawek Kaplonski (slaweq)]

Due to lack of any activity in this RFE since more than 1 year, I'm going to close it for now. If You would be still interested in implementing this and would like to continue discussion on that, feel free to reopen it and ping me (slaweq) on irc.