I went for the virtual field approach.
My field in my model:
#Virtual field for showing categories in view
def categories(row):
links = db(db.post_to_cat.post_id == row.blog_post.id).select()
ids = [{'name':l.cat_id.name, 'slug':l.cat_id.slug} for l in links]
return ids
#Appending the virtual field to blog_post table
db.blog_post.categories = Field.Virtual('categories', categories)
And in the view:
{{for p in posts:}}
{{for c in p.categories:}}
<a href="{{=URL('blog', 'index', args=p['slug'])}}">{{=c['name']}}</a>
{{pass}}
{{pass}}
--
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