[wp-hackers] Search in 3.0

Brent thenbrent at gmail.com
Tue Feb 16 05:54:21 UTC 2010

I'd really like to see this filter added. :)

On Tue, Feb 16, 2010 at 11:40 AM, Andy Skelton <skeltoac at gmail.com> wrote:

> Since mentoring Justin Shreve on the Search API project last summer, I
> have wanted to make it easier for plugins to replace the core search
> functionality. At first I thought I should roll the results of the
> project into core. While trying to do that, I found a simpler
> solution. Review the changeset first and then I'll explain its power.
> http://core.trac.wordpress.org/changeset/13037
> Before this change, you had to do crazy things to override core
> search. With the new filter you can do it sanely and get stuff like
> paging and privacy checks for free.
> These filter usage examples are in the order in which I discovered them:
> $search = "AND ID IN (1, 2, 3)"; // known ID's
> $search = "AND ID IN (SELECT ID FROM...)"; // subquery
> $search = ""; // tricky!
> The first example uses a known set of ID's that match the search
> query. These might be found by querying an external search API. If the
> set of ID's is complete, paging will work as expected. If you can't
> use a complete set of matching ID's, paging the results will be a lot
> more work.
> The second example uses a subquery to find the ID's. Subqueries rock.
> You can use them to get the set of ID's from other tables in your
> database. But this example has an important limitation: you can't
> control the order of the final result set by the order of the subquery
> in an IN clause.
> The third example is what I'm using right now on skeltoac.com. My
> fulltext subquery is in a RIGHT JOIN clause (filter posts_join). This
> way I can use the MATCH score to sort the results (filter
> posts_orderby). The query ends up looking like this (simplified):
>  wp_posts.* FROM wp_posts
>      post_id,
>      MATCH... AS score
>    FROM wp_fulltext
>  ) AS ft ON (ID=ft.post_id)
> WHERE 1=1...
> Here is the live code (about 100 lines):
> http://skeltoac.com/fulltext.php.txt
> The list of features/benefits:
> * Index covers all searchable post types and statuses (stati)
> * Index includes title+content+taxonomies
> * Fulltext search allows sorting results by relevance
> * Works with existing query patterns
> * Paging, privacy, etc., all handled by core
> And the list of known issues:
> * Searchable text (title+content+taxonomies) might have room for
> improvement
> * Missing a bunch of actions to trigger re-indexing a post
> * Should not be indexing the whole blog on the activation hook
> * Should not assume the indexing can be done within memory limits
> * Chronological paging links (Older, Newer) inappropriate for
> relavance-ordered results
> I just wrote this plugin today, borrowing a few key lines from
> Justin's work. If you are interested in search, please review my code
> and think about how it works. If you think of any minor core changes
> that would make search easier to plug in, please make them known ASAP.
> Little things like filters aren't strictly subject to feature freeze
> and can add tremendous value to 3.0.
> Cheers,
> Andy Skelton
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