wintermeyer
How to Autoload Calculations?
Is there a way to autoload calculations? Right now I can do Accounts.User.by_id!("123") |> Accounts.load(:gravatar_hash) but I’d like to be able to get the same result with just Accounts.User.by_id!("123")
- Is that possible?
- Is there a reason not to autoload? Other than performance.
The module
defmodule Animina.Accounts.User do
# ...
attributes do
uuid_primary_key :id
attribute :email, :ci_string, allow_nil?: false
attribute :hashed_password, :string, allow_nil?: false, sensitive?: true
end
calculations do
calculate :gravatar_hash, :string, {Animina.Calculations.Md5, field: :email}
end
# ...
identities do
identity :unique_email, [:email]
end
actions do
defaults [:read]
end
code_interface do
define_for Animina.Accounts
define :read
define :by_id, get_by: [:id], action: :read
end
end
``
Marked As Solved
zachdaniel
Creator of Ash
You can use the global preparations block to add a preparation to all read actions, and then you can use the build/1 preparation to add to the query.
prepare build(load: [:calc])
The only reason not to autoload would be performance
. I generally avoid it, but if its a simple calculation and you access it all the time, its not a big deal at all.
1
Also Liked
wintermeyer
For everybody who needs it spoon fed (like me) here’s the code solution:
preparations do
prepare build(load: [:gravatar_hash])
end
2
Popular in Questions
How to bind a phoenix app to a specific ip address?
could not find anything about that, nowhere, unfortunately, but for me this is quite...
New
To my knowledge, put_in, Map.update etc. all have the one limitation of not automatically creating intermediate keys when needed (for exa...
New
Hi,
I am new to Elixir. I am trying to use the DateTime component to insert a date into MySQL however the there seems to be no way to fo...
New
I’m working on defining a simple Ecto schema for a table (in PostGres), but I don’t see where I can define a column as NOT NULL. Conside...
New
Hi all,
I’ve just started learning Elixir and Phoenix Framework, so please pardon my n00bness at this stage.
I’m trying to use Postgres...
New
Hello everybody,
usually, I use a 29" ultra-wide monitor for VSCode which can easily accomodate explorer (files panel) + file with code ...
New
Hi all,
Trying to get some more clarity over utc_datetime and naive_datetime for Ecto:
The documentation above suggests that while ...
New
Using vs code and installed ElixirLS: support and debugger.
And I got an error popped up on start up says
Failed to run ‘elixir’ comma...
New
I have a super simple question about elixir - how would I take a file like this
foo
bar
baz
and output a new file that enumerates th...
New
What is the proper way to load a module from a file in to IEX?
In the python world, doing something like this pretty standard:
from ....
New
Other popular topics
This post is a wiki (feel free to hit the edit button near the bottom right of this post to add your own changes!)
This post collects co...
New
Phoenix 1.4.0 released
Phoenix 1.4 is out! This release ships with exciting new features, most notably
with HTTP2 support, improved deve...
New
Surface is an experimental library built on top of Phoenix LiveView and its new LiveComponent API that aims to provide a more declarative...
New
This release brings a number of exciting features, including integration with the new Phoenix LiveDashboard and Phoenix LiveView. There h...
New
Hi everyone,
One of the features added to Elixir early on to help integration with Erlang code was the idea of overridable function defi...
New
Why is it that the mnesia database isn’t the most preferred database for use in Elixir/Phoenix?
New
Hello again - after a longish gap I’ve decided I really must dig into Elixir and see what’s been happening here - so I have a few questio...
New
I am trying to start a new phoenix project with elixir 1.9, but mix phx.new does not work. It says that ** (Mix) The task "phx.new" could...
New
We’ve put together this wiki for Phoenix LiveView - please feel free to add any info you feel is worth including.
What is Phoenix LiveV...
New
There are pre-rolled solutions for other frameworks that do work. However, Phoenix does not seem to have these. Have people had good expe...
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
- #phoenix_html
- #iex
- #blog-post
- #graphql
- #genstage
- #ai
- #websockets
- #supervisor
- #advent-of-code
- #elixirconf-us
- #distillery
- #processes
- #forms
- #api
- #metaprogramming
- #security
- #performance









