[wp-hackers] Creating Custom Taxonomies on the fly

Haluk Karamete halukkaramete at gmail.com
Sun Jan 30 02:45:51 UTC 2011

Dion, here is the part I don't get; "We want Tags which are attached
to <list of posts in category>"

I think your solution approaches the matter from a different
implementation. My first idea was to sort this matter our per post and
at post update time. One post at a time. From you, what I get is do
this every 24 hrs or so as a batch process. That for sure will cause
some DB crunching while that process is sorting the matter out.

Let's take it from another example... that is run time processing at
categorty.php level and relying on super cache magic.

category.php will ask

what category of posts I'm supposed to deliver now?
answer: deliver catid:14

category.php will ask to wp_posts and to wp_term_relationships and to
wp_terms tables
Give me a list of all the distinct tags that belong to those posts
where the posts have been categorized under 14.

This is one heck of SQL query. I would never do it.

I think doing this at post update time is better. What do you think?

On Sat, Jan 29, 2011 at 6:30 PM, Haluk Karamete <halukkaramete at gmail.com> wrote:
> For the site I have in mind, 100's of cats, 1000's of posts... So
> whatever it is got to scale up.
> On Sat, Jan 29, 2011 at 3:43 PM, Dion Hulse (dd32) <wordpress at dd32.id.au> wrote:
>> On Sun, 30 Jan 2011 10:33:50 +1100, Haluk Karamete <halukkaramete at gmail.com>
>> wrote:
>>> Do you see some value in this approach? Or are there easier/smarter
>>> ways to address the problem I'm trying to solve with less hassle?
>> How many posts are we talking here?
>> Whilst your proposed selection would work, it does sound like a lot of
>> processing to ensure that the terms are kept in sync..
>> My method would be:
>> Generate tag cloud
>>  - Are we on a category view?
>>  - No: Generate as normal
>>  - Yes: Filter the terms:
>>   - We want Tags which are attached to <list of posts in category>
>> You'd have to add some caching to that, and theres a good chance you'd have
>> to filter some SQL there for best performance.
>> I've done something similar (intersections of terms) for navigational
>> elements of a custom taxonomy, ie. Site has multiple sections, and a set of
>> navigational elements to drill down, In the drill down, you only want
>> elements selectable which the section of the site has available
>> Dion Hulse / dd32
>> Contact:
>>  e: contact at dd32.id.au
>>  Web: http://dd32.id.au/
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