Sakthibalan

Sakthibalan

How to fetch unique user by ‘user_id’ a query with distinct

Resources:

  1. Ash.Domain.User

  2. Ash.Domain.Project
    has_many :milestones

  3. Ash.Domain.Milestone
    belongs_to :project
    has_many :tasks

  4. Ash.Domain.Task
    belongs_to :milestone
    has_one :task_assignee

  5. Ash.Domain.TaskAssignee
    belongs_to :user
    belongs_to :task

How to fetch unique users from a project using a distinct query?

I tried this below query:
Project
|> Ash.Query.filter(name: “example”)
|> Ash.Query.load([milestones: [tasks: :task_assignee]])
|> Ash.Query.distinct([:user_id])
|> Ash.read!()

  • unknown error: :distinct

Showing Posts 1 to 1

zachdaniel

zachdaniel

Creator of Ash

I think you’d have a lot better luck with something like:

User
|> Ash.Query.filter(exists(task_assignee.task.milestone.project, name == "example"))

than trying to load distinct users starting at Project. If you did want to do it, though, you’d need something like:

Project
|> Ash.Query.filter(name: “example”)
|> Ash.Query.load([milestones: [tasks: task_assignee: Ash.Query.distinct(TaskAssignee, :user_id)]])
|> Ash.Query.distinct([:user_id])
|> Ash.read!()
|> # extract all of the task assignees from this data structure, because you will get back a list of `%Project{}`
— All posts loaded —

Where Next? Top

Trending in Questions Top

katta
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
brecabral
Documentation While reading the Scoped Routes section, I noticed that the documentation currently refers to a problem without explainin...
New
nseaSeb
Hello, I know there is an approach for handling lists that allows for optimized traversal, but I can’t recall the specific method (somet...
New
kpanic
Hi everyone, I am toying with the idea of building a “match maker” for giving personal help to people that wants to start coding. I sta...
New
velrest
So my question is quite simple and i have found no conclusive answer on forum, google or AI. Should we use :erlang.float for Integer to ...
New
asweet-confluent
I recently noticed that Elixir’s Logger defaults its primary log level to :debug when no :logger, :level application configuration is pre...
New
apz
I’m new to elixir and just tried to install the elixirLS extension for VScode(ium) and it is throwing some errors that I would like help ...
New

Other Trending Topics Top

GenericJam
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
JesseHerrick
Hey, I’m Jesse and I’m the main contributor behind Dexter, a full-featured, lightning-fast Elixir LSP optimized for large codebases. It s...
New
mudasobwa
I am happy to introduce the very α version of the new programming language compiled to BEAM. Welcome Cure. It has literally three kille...
New
garrison
Hobbes is a low-level distributed database for the Elixir programming language. Hobbes provides a simple, safe, and scalable storage lay...
New
mhanberg
Hi everyone! The first release candidate for the Expert language server project is now available! We’ve published a press release detai...
New
budgie
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

We're in Beta

About us Mission Statement

Options

Thread Display Mode




Thread Preview

Skip Thread Previews