kamaroly
Ash is not triggering before_action hook’s callback function if the update action is atomic, but when I set require_atomic? false in the action, Ash calls thecallback function (request_approval/3) as expected.
The create action works well. I am not sure why the update action is not working as expected on the atomic updates. What could I be getting wrong?
Below is my change:
defmodule MyApp.Changes.SubmitForApproval do
use Ash.Resource.Change
@impl Ash.Resource.Change
def change(%{context: %{changes_approved?: true}} = changeset, _opts, _context) do
# Changes have been approved, proceed to persist in the datalayer as expected.
changeset
end
def change(changeset, opts, context) do
# Changes are yet to be approved, seek approval before persisting them in the database
# !!! ========================================!!!
# Atomic updates are not firing request_approval/3 function.
# !!! ========================================!!!
Ash.Changeset.before_action(changeset, &request_approval(&1, opts, context))
end
@impl Ash.Resource.Change
def atomic(changeset, opts, context) do
{:ok, change(changeset, opts, context)}
end
defp request_approval(changeset, opts, context) do
# ================================================
# !!! THIS IS NOT REACHED WHEN UPDATES ARE ATOMIC !!!
# ================================================
# 1. Serialize the changeset
# 2. Store the change request for approval
# 2. Prevent submitting to underlying datalayer until approved
changeset
end
end
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zachdaniel
Atomic update actions do not support before action hooks. We should be adding an error there instead of skipping them though.
kamaroly
Thanks @zachdaniel. Is there a way to set
require_atomic? falseglobally on specific resources?What I want is that if
ash_approvalextension is added to a resource, the atomic updates should be disabled conditionally based on whether changes have been approved or not.zachdaniel
I’m pretty sure you can’t do that at all. The whole concept of atomicity in Ash is about “not reading the record before updating it”. Could you describe more of what you’re trying to accomplish? How is approval stored and how is it checked?
kamaroly
The goal is to implement a maker-checker mechanism to changes.
Here is how I do it. It works for create but not for updates.
changesettobinaryand store it in thechange_requeststable.