3 replies

Complex actor logic in expressions?

Since actors aren't constrained to be instances of ash resources, and in expressions, templates do simple

get_in

get_in

calls (link), it seems somewhat challenging to represent logic in expressions that relies on anything more than simple attributes on the actor. In some calculations I'm working on, I've resorted to representing this something like this:

@impl Ash.Resource.Calculation
def expression(_opts, %{actor: actor}) do
  some_complex_boolean_calculation? = Ash.calculate!(actor, :some_complex_boolean_calculation)
  if some_complex_boolean_calculation? do
    # specific expression if true
    expr(...)
  else
    # specific expression if false
    expr(...)
  end
end

@impl Ash.Resource.Calculation
def expression(_opts, %{actor: actor}) do
  some_complex_boolean_calculation? = Ash.calculate!(actor, :some_complex_boolean_calculation)
  if some_complex_boolean_calculation? do
    # specific expression if true
    expr(...)
  else
    # specific expression if false
    expr(...)
  end
end

This works OK, but feels a little clunky. I could also use fragments in the expression along with the actor ID to go full "manual" mode and do my actor calculation manually, but that loses all the benefits of having those calculations encapsulated on the resource.

Is there any known advice on the best practice for handling this sort of thing?

Ash Framework•4mo ago•

3 replies

Jesse Williams

Complex actor logic in expressions?

Since actors aren't constrained to be instances of ash resources, and in expressions, templates do simple

get_in

get_in

@impl Ash.Resource.Calculation
def expression(_opts, %{actor: actor}) do
  some_complex_boolean_calculation? = Ash.calculate!(actor, :some_complex_boolean_calculation)
  if some_complex_boolean_calculation? do
    # specific expression if true
    expr(...)
  else
    # specific expression if false
    expr(...)
  end
end

@impl Ash.Resource.Calculation
def expression(_opts, %{actor: actor}) do
  some_complex_boolean_calculation? = Ash.calculate!(actor, :some_complex_boolean_calculation)
  if some_complex_boolean_calculation? do
    # specific expression if true
    expr(...)
  else
    # specific expression if false
    expr(...)
  end
end

Complex actor logic in expressions?

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