Postgres: filtering results using ARRAY_AGG and HAVING (instead of WHERE)

Question

So my database contains a listing of items:

items:  item.id | item.title

And I have a second table that associates a number of tags with the it

Answer 1

Turns out that Postgres's ANY keyword is sided and can't be used symmetrically.

Thus the working code is:

SELECT items.id, items.title, ARRAY_AGG(tags.tag_id)
FROM items
INNER JOIN tags ON (tag.tag_id=items.id)
GROUP BY items.id
HAVING 27 = ANY(ARRAY_AGG(tags.tag_id))