<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="font-family: arial, sans-serif; font-size: medium;" class=""><div dir="ltr" class=""><div class="gmail_extra"><div class="gmail_quote"><div class="headers" style="margin-top: 2pt;">Hi Angus,</div><div class="headers" style="margin-top: 2pt;"><br class=""></div><div class="headers" style="margin-top: 2pt;">Yeah, I missed the new Nova tags, they do seem very similar to Heat’s tags. </div><div class="headers" style="margin-top: 2pt;"><br class=""></div><div class="headers" style="margin-top: 2pt;">I should have been more clear when we discussed this on IRC regarding the API-WG position on filtering. I was aware of the lack of guidelines on filtering, and being an active member of the API-WG team I consider this a good opportunity to add more content on this topic.</div><div class="headers" style="margin-top: 2pt;"><br class=""></div><div class="headers" style="margin-top: 2pt;">The closest thing that we have in API-WG is a sorting guideline, which gathered very positive reviews. Some aspects of it, such as the structure of the URL arguments, can be adapted to filtering, so maybe I should take all this information and try to come up with generic filtering guidelines that Heat can use and API-WG can publish.</div><div class="headers" style="margin-top: 2pt;"><br class=""></div><div class="headers" style="margin-top: 2pt;">Thanks!</div><div class="headers" style="margin-top: 2pt;"><br class=""></div><div class="headers" style="margin-top: 2pt;">Miguel</div><div class="headers" style="margin-top: 2pt;"><br class=""></div><div class="headers" style="margin-top: 2pt;"><br class=""></div><div class="headers" style="margin-top: 2pt;"><br class=""></div><div class="headers" style="margin-top: 2pt;">From: Angus Salkeld <<a target="_top" href="http://gmane.org/get-address.php?address=asalkeld%2dnYU0QVwCCFFWk0Htik3J%2fw%40public.gmane.org" rel="nofollow" style="color: rgb(0, 35, 144); font-weight: bold; text-decoration: none;" class="">asalkeld@...</a>><br class="">Subject: <a target="_top" rel="nofollow" href="http://news.gmane.org/find-root.php?message_id=CAA16xczDTXGZp%5feEbdWGkjxtrXy2Et6t3gPo%3d8h308eYPFznOg%40mail.gmail.com" style="color: rgb(0, 35, 144); font-weight: bold; text-decoration: none;" class="">Re: Filtering by metadata values</a><br class="">Newsgroups: <a href="http://news.gmane.org/gmane.comp.cloud.openstack.devel" target="_top" style="color: rgb(0, 35, 144); font-weight: bold; text-decoration: none;" class="">gmane.comp.cloud.openstack.devel</a><br class="">Date: 2015-02-11 03:03:26 GMT (1 hour and 19 minutes ago)<br class=""></div><div class=""><br class="webkit-block-placeholder"></div><div class=""><div dir="ltr" class=""><div class="gmail_extra"><div class="gmail_quote">On Wed, Feb 11, 2015 at 8:20 AM, Miguel Grinberg <span dir="ltr" class=""><<a href="mailto:miguel.grinberg-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org" target="_blank" style="color: rgb(0, 35, 144); font-weight: bold; text-decoration: none;" class="">miguel.grinberg <at> gmail.com</a>></span> wrote:<br class=""><blockquote class="gmail_quote">Hi,<br class=""><br class="">We had a discussion yesterday on the Heat channel regarding patterns for searching or filtering entities by its metadata values. This is in relation to a feature that is currently being implemented in Heat called “Stack Tagsâ€.<br class=""><br class="">The idea is that Heat stack lists can be filtered by these tags, so for example, any stacks that you don’t want to see you can tag as “hiddenâ€, then when you request a stack list you can specify that you only want stacks that do not have the “hidden†tag.<br class=""><br class=""></blockquote><div class=""><br class=""></div><div class="">Some background, the author initially just asked for a field "hidden". But it seemed like there were many more use cases that could be fulfilled by having<br class=""></div><div class="">a generic "tags" on the stack REST resource. This is really nice feature from UI perspective.<br class=""></div><div class=""> </div><blockquote class="gmail_quote">We were trying to find other similar usages of tags and/or metadata within OpenStack projects, where these are not only stored as data, but are also used in database queries for filtering. A quick search revealed nothing, which is surprising.<br class=""></blockquote><div class=""><br class=""></div><div class="">I have spotted nova's instance tags that look like the kinda beast we are after:<br class=""></div><div class=""> - <a href="https://blueprints.launchpad.net/nova/+spec/tag-instances" style="color: rgb(0, 35, 144); font-weight: bold; text-decoration: none;" class="">https://blueprints.launchpad.net/nova/+spec/tag-instances</a><br class=""> - <a href="https://review.openstack.org/#/q/topic:bp/tag-instances,n,z" style="color: rgb(0, 35, 144); font-weight: bold; text-decoration: none;" class="">https://review.openstack.org/#/q/topic:bp/tag-instances,n,z</a><br class=""><br class=""> </div><blockquote class="gmail_quote"><br class="">Is there anything I may have missed? I would like to know if there anything even remotely similar, so that we don’t build a new wheel if one already exists for this.<br class=""><br class=""></blockquote><div class=""><br class=""></div><div class="">So we wanted to bring this up as there is a API WG and the concept of tags and filtering should be consistent<br class="">and we don't want to run off and do something that the WG really doesn't like.<br class=""></div><div class=""><br class="">But it looks like this needs a bit more fleshing out:<br class=""> <a href="http://specs.openstack.org/openstack/api-wg/guidelines/pagination_filter_sort.html#filtering" style="color: rgb(0, 35, 144); font-weight: bold; text-decoration: none;" class="">http://specs.openstack.org/openstack/api-wg/guidelines/pagination_filter_sort.html#filtering</a><br class=""><br class=""></div><div class="">Should we just follow nova's instance tags, given the lack of definition in api-wg?<br class=""><br class=""></div><div class="">Regards<br class="">Angus<br class=""></div><div class=""><br class=""></div><blockquote class="gmail_quote">Thanks,<br class=""><br class="">Miguel<br class="">__________________________________________________________________________<br class="">OpenStack Development Mailing List (not for usage questions)<br class="">Unsubscribe: <a href="http://OpenStack-dev-request-ZwoEplunGu0gQVYkTtqAhEB+6BGkLq7r@public.gmane.org/?subject:unsubscribe" target="_blank" style="color: rgb(0, 35, 144); font-weight: bold; text-decoration: none;" class="">OpenStack-dev-request-ZwoEplunGu0gQVYkTtqAhA@public.gmane.orgorg?subject:unsubscribe</a><br class=""><a href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev" target="_blank" style="color: rgb(0, 35, 144); font-weight: bold; text-decoration: none;" class="">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</a><br class=""></blockquote></div><br class=""></div></div></div><pre class="">__________________________________________________________________________
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