AE
Ash Elixir•2y ago
WIGGLES

Read Action Prepare does not load aggregate

I have a resource with a count aggregate for a child resource 
aggregates do
  count :response_count, :responses
end
aggregates do
  count :response_count, :responses
end
I then have a default read action that uses prepare and build to load the aggregate 
read :read do
  primary? true
  pagination offset?: true, keyset?: true, required?: false

  prepare build(aggregate: {:response_count, :count, :responses}, load: [:responses])
end
read :read do
  primary? true
  pagination offset?: true, keyset?: true, required?: false

  prepare build(aggregate: {:response_count, :count, :responses}, load: [:responses])
end
Note that I have currently loaded responses to use the length method to get a count, but whenever I attempt to access response_count it returns an Ash.NotLoaded<:aggregate> value. Loving ASH btw, It cuts down on a lot of the boilerplate that you get with normal Phoenix contexts.
2 Replies
barnabasj
barnabasj•2y ago
I think you have to put, everything into load, at least I have loaded calculations that way. Haven't really used aggregates so far. 
prepare build(load: [:responses, :response_count])
prepare build(load: [:responses, :response_count])
If I've understood the documentation correctly you can add an ad-hoc aggregate using the aggregate option (an aggregate that you haven't already specified on the resource)
WIGGLES
WIGGLESOP•2y ago
Yeah, you're right. Thanks!

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