Try this (untested)
categories_used = [x.category for x in
db().select(db.news.category,orderby=db.news.category))]
categories = db(db.news_categories.id.belongs(categories_used).select(
db.news_categories.name)
Johann
On 9 March 2015 at 18:53, Gael Princivalle <gaelprinciva...@gmail.com>
wrote:
>
> Hello all.
>
> I've got some news categories:
> db.define_table('news_categories',
> Field('name', type='string', requires=IS_NOT_EMPTY(),
> label='Nome'),
> format = '%(name)s')
>
> And some news:
> db.define_table('news',
> Field('title', type='string', requires=IS_NOT_EMPTY()),
> Field('body', type='text''),
> Field('category', 'reference news_categories', requires =
> IS_IN_DB(db, db.news_categories.id,'%(name)s'),
> represent=lambda id, r: db.news_categories[id].name))
>
> How can I select only the news_categories that have almost one news of
> that category ?
> Now I've got all categories.
> categories=db().select(db.news_categories.ALL)
>
> Thanks.
>
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> - http://github.com/web2py/web2py (Source code)
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