statsdatacode
Question
Is it possible to use a calculation in the grouping for an aggregate?
Problem
I am attempting to group by a calculated value within an aggregate. Specifically calculating the sum of a field value for each type_name by calendar date.
I have attempted to define the aggregate within the resource as well as within the query and am unable to get any further with this.
Example:
Example resource:
defmodule Example.TimeSeriesResource do
use Ash.Resource,
data_layer: AshPostgres.DataLayer
postgres do
table "type_values"
repo Example.Repo
end
attributes do
integer_primary_key :id
attribute :date_time, :datetime do
allow_nil? false
end
attribute :type_name, :string do
allow_nil? false
end
attribute :value, :float do
allow_nil? false
end
end
calculations do
calculate :calendar_date, :date, expr(type(:date_time, :date))
end
end
If I define an aggregate within the resource, such as:
aggregates do
sum :total_value, [:calendar_date, :type_name], :value
end
this fails to compile, returning the following explanation in the compilation error:
aggregates -> total_value:
relationship referenced in aggregate `Example.TimeSeriesResource.calendar_date` does not exist
When I have attempted to use a custom aggregate in the query, such as:
query = Example.TimeSeriesResource
|> Ash.Query.for_read(:read)
|> Ash.Query.load(:calendar_date)
|> Ash.Query.aggregate(:value, :sum, [:calendar_date, :type_name])
I get the following error:
** (ArgumentError) `nil` is not a Spark DSL module.
nil.entities([:actions])
(spark 1.1.54) lib/spark/dsl/extension.ex:171: Spark.Dsl.Extension.get_entities/2
(ash 2.18.2) lib/ash/resource/info.ex:553: Ash.Resource.Info.primary_action/2
(ash 2.18.2) lib/ash/resource/info.ex:539: Ash.Resource.Info.primary_action!/2
(ash 2.18.2) lib/ash/query/query.ex:2030: Ash.Query.aggregate/14
where the stacktrace shows an attempt to call Ash.Query.aggregate/14 rather than the expected Ash.Query.aggregate/4.
Trending in Questions
Hello!
Suppose you are building workflow (order / task / payment) processing system with the following requirements:
Each workflow con...
New
I’m in search of an Elixir library that offers PDF generation capabilities similar to Ruby’s Prawn. While there have been discussions abo...
New
I’m looking to build a personal workflow to quickly deploy web applications written in elixir/phoenix, for local consumption (ie not on t...
New
Before I dive in myself, did anyone successfully sprinkle Hologram into their existing LiveView app?
Looking for hints regarding:
Addi...
New
Kia ora,
We have been using elixir-google-api to connect to Google Drive. However, with the updates to Tesla due to CVEs this is now bro...
New
Hi all, I wanted to ask how the community is dealing with post-release steps.
Today we have Ecto migrations, which make sure that the db...
New
Hello,
I have an Elixir backend that implements a custom protocol over TCP. I want to load test the backend and assess the performance o...
New
Other Trending Topics
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
Beam Bots (or just BB for short) is a framework for building fault-tolerant robotics applications in Elixir using familiar OTP patterns. ...
New
Hello everyone. After busy few months I am happy to announce v0.1.0 of Emerge & Solve.
They are GUI (Emerge) and State management (S...
New
Corex is an accessible, unstyled UI component library for Phoenix that integrates Zag.js state machines using Vanilla JavaScript and Live...
New
Emily is an Elixir library that runs Nx computations on Apple’s MLX. Install it as the default Nx backend and Nx, defn, Axon, Nx.Serving,...
New
There are three potential reasons for members of this forum to have a look at https://vutuv.de
You are tired or annoyed of LinkedIn.
Yo...
New
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #deployment
- #library
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #channels
- #elixirconf
- #exunit
- #discussion
- #code-sync
- #javascript
- #podcasts
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #elixir-ls
- #blog-post
- #phoenix_html
- #iex
- #graphql
- #ai
- #genstage
- #elixirconf-us
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #processes
- #api
- #forms
- #metaprogramming
- #security
- #hex










First 2 of 2 Posts
zachdaniel
Ash does not support grouping aggregates currently. Aggregates are “per-record”. To do grouping you’ll need to use Ecto.
Example.TimeSeriesResourceis an ecto schema automatically, so you can directly query it. Additionally, you can turn an ash query into the relevant ecto query:statsdatacode
Thanks @zachdaniel - I’ll give that a go