Postgres - aggregate two columns into one item

Question

I would like to aggregate two columns into one "array" when grouping.

Assume a table like so:

friends_map:
=================================
user_id    friend_id    confirmed
=================================
1          2            true
1          3            false
2          1            true
2          3            true
1          4            false

I would like to select from this table and group by user_id and get friend_id and confirmed as a concatenated value separated by a comma.

Currently I have this:

SELECT user_id, array_agg(friend_id) as friends, array_agg(confirmed) as confirmed
FROM friend_map
WHERE user_id = 1
GROUP BY user_id

which gets me:

=================================
user_id    friends      confirmed
=================================
1         [2,3,4]       [t, f, f]

How can I get:

=================================
user_id    friends     
=================================
1         [ [2,t], [3,f], [4,f] ]

Answer 1

SELECT user_id, array_agg((friend_id, confirmed)) as friends
FROM friend_map
WHERE user_id = 1
GROUP BY user_id

user_id |           array_agg            
--------+--------------------------------
      1 | {"(2,true)","(3,false)","(4,false)"}