ash
ash v2.11.8

View Source Ash.Calculation behaviour (ash v2.11.8)

The behaviour for a calculation module

Use select/2 to apply a select statement when the calculation is loaded. This does not apply in the case that you are loading on existing resources using MyApi.load. It also doesn't apply when the calculation is used in a filter or sort, because it is not necessary to select fields to power filters done in the data layer.

Link to this section Summary

Types

context()
opts()

Callbacks

calculate(list, opts, context)
describe(opts)
expression(opts, context)
init(opts)
load(t, opts, context)
select(t, opts, context)

Link to this section Types

Link to this type

context()

View Source 
@type context() :: %{
  :actor => term() | nil,
  :tenant => String.t() | nil,
  :authorize? => boolean() | nil,
  :tracer => module() | nil,
  optional(atom()) => any()
}
Link to this type

opts()

View Source 
@type opts() :: Keyword.t()

Link to this section Callbacks

Link to this callback

calculate(list, opts, context)

View Source (optional) 
@callback calculate([Ash.Resource.record()], opts(), context()) ::
  {:ok, [term()]} | [term()] | {:error, term()} | :unknown
Link to this callback

describe(opts)

View Source 
@callback describe(opts()) :: String.t()
Link to this callback

expression(opts, context)

View Source (optional) 
@callback expression(opts(), context()) :: any()
Link to this callback

init(opts)

View Source 
@callback init(opts()) :: {:ok, opts()} | {:error, term()}
Link to this callback

load(t, opts, context)

View Source 
@callback load(Ash.Query.t(), opts(), context()) :: atom() | [atom()] | Keyword.t()
Link to this callback

select(t, opts, context)

View Source 
@callback select(Ash.Query.t(), opts(), context()) :: [atom()]