Comments on: Selecting related tags with SQL

By: cakebaker

cakebaker — Thu, 05 Feb 2009 17:01:13 +0000

@speedmax, majna: Thanks for your comments!

@speedmax: Thanks for sharing your TaggableBehavior! Your findRelatedTags() seems to be cleaner than the SQL I’m currently working on to retrieve the related tags when you provide multiple tags.

@majna: Thanks for this tip!

By: majna

majna — Wed, 04 Feb 2009 09:34:29 +0000

Decomposing can help on larger datasets,
Use decomposing to avoid slow query.

Example:
SELECT * FROM tag
JOIN tag_post ON tag_post.tag_id=tag.id
JOIN post ON tag_post.post_id=post.id
WHERE tag.tag=’mysql’;

Decomposed:
SELECT * FROM tag WHERE tag=’mysql’;
SELECT * FROM tag_post WHERE tag_id=1234;
SELECT * FROM post WHERE post.id in (123,456,567,9098,8904);

By: speedmax

speedmax — Wed, 04 Feb 2009 03:29:24 +0000

I used pretty much exactly the same Query for my own project, then i have builded a TaggableBehavior for CakePHP to add tagging feature for any model. loosely based on DHH’s acts_as_taggable

http://gist.github.com/57906

then i have also added following methods, u may find it useful

findRelatedTags(),
findRelatedTagged(),
findPopularTag()
findTaggedWith(),
findTagCount()