Building "Tagging" feature in my site

Hi All,

I am trying to build a tagging feature in my site which is a community
site for a school.

In my site, I have various entity types like : Blog Post, Teacher,
Book .

Every entry for these entities will have tags associated with it . So,
a tag may belong to one or more items of different entities.

In a normal core PHP project, I would have designed tables for this in
the following manner :-

1) tags : tag_id, tag_name .
2) entity_types : entity_type_id, entity_type_name . [(0, Posts),
(1, Teachers), (2, Books)]
3) posts : post_id, post_name .
4) teachers : teacher_id, teacher_name .
5) books : book_id, book_name
6) entities_tags : tag_id, entity_type_id, entity_id .

So, if a book (entity_type_id = 2) with book_id = 6 has 2 tags
(tag_id, tag_name) : (11, 'Chemistry') & (23, 'Grade A') , then the
entry in entities_tags for this will be : (11, 2, 6) & (23, 2, 6) .

I am using CakePHP for my project and I am not able to design the
tables in CakePHP for this Tagging Feature.

It would be great if people could come up with their suggestions.

Thanks a lot !!

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