I actually like to have a list:reference on the table being tagged but also
have a table relating tags and the tagged table, This doesn't respect data
normalisation but makes things quite more efficient.
To give an example:
db.define_table('tag',
Field('name'),
Field('count', 'integer', writable=False, default=0),
)
db.define_table('blogpost',
Field('title'),
Field('body'),
Field('tags', 'list:reference tag')
)
db.define_table('blogpost_tag',
Field('blogpost', 'reference blogpost'),
Field('tag', 'reference tag'),
)
I then define _after_insert, _after_update and _before_delete functions for
blogpost so I keep the blogpost_tag table updated when a blogpost is
changed or inserted.
This makes it very efficient to both search using a given tag and to know
which tags a blogpost has.
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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