Annotate objects in a queryset with next and previous object ids


How do I annotate the objects in a Django ORM queryset so that every items contain IDs of the the object before (previous) and the one after (next)? I am using PostgreSQL and Django 1.11.


You could use the <a href="https://www.postgresql.org/docs/current/static/functions-window.html" rel="nofollow">window functions lag() and lead()</a>:

SELECT * , lag(id) OVER (ORDER BY id) AS prev_id -- same order as query , lead(id) OVER (ORDER BY id) AS next_id -- same order as query FROM tbl ORDER BY id;


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