Autoload an aggregation, relationship or calculation in a read action
I have a read action where I want to return the data with some aggregation/relationship/calculation data already computed instead of returning
#Ash.NotLoaded<> in these fields and having to manually run the load function to load them.
I can't find in the documentation how to do that3 Replies
You can use a “preparation” which is like a change but for read actions. If you always want it to be loaded you can use the top level preparations block which runs on all reads
That loads the calculation on all queries.
Ah! That makes sense.
I was trying that, but I thought I had to replace the
build with load loke this prepare load(:last_bid_price) 😅
Thanks, now it works great
Is there something similar for create and update actions? I would like to create the resource and already have these loaded tooYep! You can add a global change
I believe there is a
load/1 built in change.
But if not you can use a global change + returning a changeset with an after action hook using Ash.Changeset.after_action/2