18 replies

Calculations that depend on other calculations

Ash✅Solved

Hi!

I have an issue with using calculations as mentioned in the "ash-core" channel, but I figured out a bit more!

I have two calculations, both implemented using the Calculation behaviour.

Calculation 1

Calculation 1

uses the

load

load

callback to fetch a relationship and calculate a list of atoms based on the data from this relationship.

Calculation 2

Calculation 2

also loads some relationships, and calculates a map from this. The load callback for

calculation 2

calculation 2

does NOT depend on anything from

calculation 1

calculation 1

When I run

calculation 1

calculation 1

by it-self my resource contains the correct result from

Calculation 1

Calculation 1

, a list of atoms
But if I load

calculation 2

calculation 2

, in the same

Ash.load([:calc1, :calc2])

Ash.load([:calc1, :calc2])

call the result from

calculation 2

calculation 2

is correct, but the value for

calculation 1

calculation 1

is now only an empty list.
Adding some IO.inspect I can see that the relationship that

calculation 1

calculation 1

depends on is loaded from the DB but its just an empty list inside the

calculate

calculate

function.

  MyResource
  |> Ash.get(id)
  |> Ash.load!([:calc1, :calc2])

  MyResource
  |> Ash.get(id)
  |> Ash.load!([:calc1, :calc2])

But, if I load the calculations using two piped calls to

Ash.load!

Ash.load!

instead both works and the resulting resource is correct with no other changes.

  MyResource
  |> Ash.get(id)
  |> Ash.load!([:calc1])
  |> Ash.load!([:calc2])

  MyResource
  |> Ash.get(id)
  |> Ash.load!([:calc1])
  |> Ash.load!([:calc2])

Any suggestions, or thoughts on how I could go about to figure out if this is a bug or user-error?

Ash Framework•3mo ago•

18 replies

Morten Lund

Calculations that depend on other calculations

Ash✅Solved

Hi!

I have an issue with using calculations as mentioned in the "ash-core" channel, but I figured out a bit more!

I have two calculations, both implemented using the Calculation behaviour.

Calculation 1

Calculation 1

uses the

load

load

callback to fetch a relationship and calculate a list of atoms based on the data from this relationship.

Calculation 2

Calculation 2

also loads some relationships, and calculates a map from this. The load callback for

calculation 2

calculation 2

does NOT depend on anything from

calculation 1

calculation 1

When I run

calculation 1

calculation 1

by it-self my resource contains the correct result from

Calculation 1

Calculation 1

, a list of atoms
But if I load

calculation 2

calculation 2

, in the same

Ash.load([:calc1, :calc2])

Ash.load([:calc1, :calc2])

call the result from

calculation 2

calculation 2

is correct, but the value for

calculation 1

calculation 1

is now only an empty list.
Adding some IO.inspect I can see that the relationship that

calculation 1

calculation 1

depends on is loaded from the DB but its just an empty list inside the

calculate

calculate

function.

  MyResource
  |> Ash.get(id)
  |> Ash.load!([:calc1, :calc2])

  MyResource
  |> Ash.get(id)
  |> Ash.load!([:calc1, :calc2])

But, if I load the calculations using two piped calls to

Ash.load!

Ash.load!

instead both works and the resulting resource is correct with no other changes.

  MyResource
  |> Ash.get(id)
  |> Ash.load!([:calc1])
  |> Ash.load!([:calc2])

  MyResource
  |> Ash.get(id)
  |> Ash.load!([:calc1])
  |> Ash.load!([:calc2])

Any suggestions, or thoughts on how I could go about to figure out if this is a bug or user-error?

Calculations that depend on other calculations

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