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A declarative, extensible framework for building Elixir applications.

Security advisory: This version has known vulnerabilities. View advisories

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ash lib ash resource calculation calculation.ex
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lib/ash/resource/calculation/calculation.ex

defmodule Ash.Resource.Calculation do
@moduledoc "Represents a named calculation on a resource"
defstruct [
:name,
:type,
:calculation,
:arguments,
:description,
:constraints,
:private?,
:allow_nil?,
:select,
:load,
filterable?: true
]
@schema [
name: [
type: :atom,
required: true,
doc: "The field name to use for the calculation value"
],
type: [
type: :any,
doc: "The type of the calculation. See `Ash.Type` for more.",
required: true
],
constraints: [
type: :keyword_list,
default: [],
doc: "Constraints to provide to the type. See `Ash.Type` for more."
],
calculation: [
type:
{:or,
[
{:spark_function_behaviour, Ash.Calculation, {Ash.Calculation.Function, 2}},
{:custom, __MODULE__, :expr_calc, []}
]},
required: true,
doc: """
The module or `{module, opts}` to use for the calculation
Also accepts a function that takes the list of records and the context.
"""
],
description: [
type: :string,
doc: "An optional description for the calculation"
],
private?: [
type: :boolean,
default: false,
doc: """
Whether or not the calculation will appear in any interfaces created off of this resource, e.g AshJsonApi and AshGraphql
See the [security guide](/documentation/topics/security.md) for more.
"""
],
select: [
type: {:list, :atom},
default: [],
doc: "A list of fields to ensure selected if the calculation is used."
],
load: [
type: :any,
default: [],
doc: "A load statement to be applied if the calculation is used."
],
allow_nil?: [
type: :boolean,
default: true,
doc: "Whether or not the calculation can return nil."
],
filterable?: [
type: {:or, [:boolean, {:in, [:simple_equality]}]},
default: true,
doc: "Whether or not the calculation should be usable in filters."
]
]
@type t :: %__MODULE__{
name: atom(),
calculation: {:ok, {atom(), any()}} | {:error, String.t()},
arguments: list(any()),
description: String.t() | nil,
private?: boolean,
allow_nil?: boolean
}
@type ref :: {module(), Keyword.t()} | module()
defmodule Argument do
@moduledoc "An argument to a calculation"
defstruct [:name, :type, :default, :allow_nil?, :constraints, :allow_expr?]
@schema [
name: [
type: :atom,
required: true,
doc: "The name of the argument"
],
type: [
type: Ash.OptionsHelpers.ash_type(),
required: true,
doc: "The type of the argument. See `Ash.Type` for more."
],
default: [
type: {:or, [{:mfa_or_fun, 0}, :literal]},
required: false,
doc: "A default value to use for the argument if not provided"
],
allow_nil?: [
type: :boolean,
default: true,
doc: "Whether or not the argument value may be nil (or may be not provided)"
],
allow_expr?: [
type: :boolean,
default: false,
doc: "Allow passing expressions as argument values. Expressions cannot be type validated."
],
constraints: [
type: :keyword_list,
default: [],
doc:
"Constraints to provide to the type when casting the value. See the type's documentation and `Ash.Type` for more."
]
]
def schema, do: @schema
end
def schema, do: @schema
def expr_calc(expr) when is_function(expr) do
{:error,
"Inline function calculations expect a function with arity 2. Got #{Function.info(expr)[:arity]}"}
end
def expr_calc(expr) do
{:ok, {Ash.Resource.Calculation.Expression, expr: expr}}
end
end