superchris
I’m sure this must be a trivial thing to do, but in looking through the documentation so far I have not figured this out. I’m trying to make a simple read action that does a substring search and the syntax is just not clear to me. Feel free to RTFM me, but please point me to the right place in the docs ![]()
Here’s what I’ve tried:
read :query do
argument :query, :string, allow_nil?: false
filter expr(contains(name, ^arg[:query]))
end
This fails compilation with undefined function contains/2 (there is no such import)
Trending in Questions
I having some trouble figuring out if I have set myself too strict of standards for my production server. Currently I can handle 75% of r...
New
Hello,
I’m trying to build a basic Phoenix web-app, and I’d like to use Tailwind.
However, when I launch mix phx.server, I get an error...
New
I’m working on a small exercise involving update_in/3, and I came up with this solution:
data = %{
name: "Periodic Table",
category:...
New
I’ve got trouble wrapping my head around the order in which functions are called in this snippet (from Phoenix’s authentication):
toke...
New
Hello folks!
So at work, we are seeing some situations where we have to define some “fixed” strings that are used across the codebase in...
New
Is there any way to avoid the Hologram compiler running when using iex? It seems like the front-end code could potentially be disregarded...
New
** (ArgumentError) expected :max_attempts to be a positive integer, got: {:@, [line: 10, column: 19], [{:max_attempts, [line: 10, column:...
New
Other Trending Topics
Edit: 2026 May 15 - This post is archived.
Mob is alive!!
Main docs: mob v0.7.11 — Documentation
A bit of explanation for the slightly c...
New
Hobbes is a low-level distributed database for the Elixir programming language.
Hobbes provides a simple, safe, and scalable storage lay...
New
A little off-topic, but I feel like people here have a good head on their shoulders.
I used to be quite good at making software. Was luc...
New
Hey. Is there anyone here who creates agents in their apps? Not talking about using agents, but creating them. I’m finding it pretty diff...
New
ExRatatui lets you cook up rich terminal UIs in Elixir, powered by Rust’s ratatui via Rustler NIFs. Build interactive terminal applicatio...
New
Just published claude-code-elixir, a plugin marketplace for Claude Code with Elixir support. These are the plugins I’ve been using for my...
New
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #library
- #deployment
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #elixirconf
- #channels
- #exunit
- #discussion
- #code-sync
- #podcasts
- #javascript
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ai
- #ecto-query
- #elixirconf-us
- #blog-post
- #elixir-ls
- #phoenix_html
- #iex
- #graphql
- #genstage
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #processes
- #elixirconf-eu
- #api
- #forms
- #security
- #metaprogramming











Showing Posts 1 to 5- Show Best Posts
- Show All (oldest first)
- Show All (newest first)
zachdaniel
zachdaniel
Oh, wait it’s
^arg(:query)zachdaniel
Doesn’t explain the error about contains/2 though
zachdaniel
As for documentation:
Examples in
Ash.Querydocs: Ash.Query — ash v3.29.3Examples in the
Ash.ResourceDSL docs: Ash.Resource — ash v3.29.3Expression reference: Expressions — ash v3.29.3
superchris
Yup, this was it! Derp. I need to pair more
The contains thing was weird though. I swear I copied that from the terminal, but when I put the code back to what I had, now I get much more helpful error about
undefined variable arg. At least that probably would have pointed me in the right direction.For posterity, this worked like a champ:
I’m sure this can be cleaned up a little, but in case someone stumbles upon this looking for the example I was looking for its a start.