avilesj
Querying an array of ints in PostgreSQL using Ecto
Hello community.
I am trying to perform the following query in Ecto
SELECT *
FROM table t
where ARRAY[2, 12] <@ list_of_ids ;
The closest I have gotten to is
from t in Table,
where: fragment("ARRAY[?] <@ ?", ^list_of_ids, r.list_of_ids)
Performing this query returns the error
(Postgrex.Error) ERROR 42883 (undefined_function) operator does no
t exist: text[] <@ integer[]
Now, I am confident the value of ^list_of_ids is a list of integers. Even so, if I hard code the values in the fragment, it works.
from t in Table,
where: fragment("ARRAY[?] <@ ?", [2,12], r.list_of_ids)
Last night I was searching about similar queries and the only similar issue I was able to find was this one in SO..
I made it work through raw query → Repo.load but I would like to know the real syntax for this operation.
So, my question is:
What is the proper Ecto syntax to accomplish what I am trying to do?
Thank you all.
Most Liked
LostKobrakai
https://hexdocs.pm/ecto/3.12.5/Ecto.Query.API.html#splice/1
This should help.
t0t0
Hi,
you shouldn’t have to wrap your values between ARRAY[ … ], could you try:
fragment("? <@ ?", ^list_of_ids, r.list_of_ids)fragment("?::INT[] <@ ?", ^list_of_ids, r.list_of_ids)fragment("? <@ ?", type(^list_of_ids, {:array, :integer}), r.list_of_ids)fragment("? <@ ?", type(^list_of_ids, r.list_of_ids), r.list_of_ids)
Nevermind, I believed that Ecto was smart enough to handle it directly (without splice/1) and the problem was related to typing (this is quite frequent with PostgreSQL).







