avilesj

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

t0t0

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).

LostKobrakai

LostKobrakai

Last Post!

andreh

andreh

Common, this is too good to be true! I’ve just removed 2 round-trips to the database and 15 lines of code thanks to you. You made my day!

Where Next?

Popular in Questions Top

rms.mrcs
Hi, I need to transform a list of numbers into a map where the keys are the indexes and the values are the original values of the list. ...
New
vonH
In asking this question I am more interested about the expressiveness of the language itself and less concerned about the availability of...
New
openscript
Hello! Sorry for this astonishing simple question, but I’m really stuck. I try to set up the intellij-elixir plugin, but I don’t know ho...
New
9mm
I am constructing a JSON object (map) and I need to conditionally set a field. I’m trying to write proper elixir-way code… and I’m at a l...
New
belgoros
I’m not a pro in using Regex and can’t figure out why the following behaviour happens, especially if we take into account the difference ...
New
jerry
Good day to you all. I have been struggling to get a query involving like and ilike to work. Can anyone assist me on this, please? pro...
New
vrod
I am using the Starship cross-shell prompt – it seems pretty nice, but I get some errors: [WARN] - (starship::utils): Executing command ...
New

Other popular topics Top

Qqwy
Update: How to use the Blogs &amp; Podcasts section You can post links to your blog posts or podcasts either in one of the Official Blog...
3271 130286 1222
New
vertexbuffer
Hello, can anybody help here..? I have a list of players and I what to delete an element, but every for loop the list is reverting to ori...
New
grych
Hi folks, Few months ago I have announced the proof-of-concept of the library to manipulate the browsers DOM objects directly from Elixi...
639 54006 488
New
jononomo
I am trying to figure out how Mix knows whether the environment is test, dev, or prod – where is this set? Thanks.
New
nsuchy
Hi. I’ve noticed that Windows Powershell has it’s own IEX command and you cannot access Elixir’s IEX due to the conflict. This isn’t a cr...
New
gshaw
What is the idiomatic way of matching for not nil in Elixir? E.g., First way: defp halt_if_not_signed_in(conn, signed_in_account) when...
New

We're in Beta

About us Mission Statement